Masaomi Washino, Chungwei Lin, Tetsuya Matsuda, Satoshi Seino, Takashi Nakagawa, and Toshihiko Kiwa, "Effect of coil geometry on sensitivity distribution in field-free line magnetic particle imaging," SCIENTIFIC REPORTS, JUL 2026:10.1038/s41598-026-61958-w

Mohd Mawardi Saari, Mohd Herwan Sulaiman, Nurul A'in Nadzri, Kenji Sakai, and Toshihiko Kiwa, "Estimation of hydrodynamic size distribution from AC Susceptibility: A model-free approach using Spline-Regularized Non-Negative Least Squares," MEASUREMENT, Vol. 271, 120979, APR 2026:10.1016/j.measurement.2026.120979

Jin Wang and Toshihiko Kiwa, "Small-molecule biosensing: from bio-inspired recognition elements and sensor devices to AI-guided design," BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN, Vol. 99, (3), uoag031, MAR 2026:10.1093/bulcsj/uoag031

Xue Ding, Yuto Ohmi, Jin Wang, Hirofumi Inoue, and Toshihiko Kiwa, "Highly sensitive detection of cancer cells using a voltage-tuned terahertz chemical microscope," SENSING AND BIO-SENSING RESEARCH, 100972, JAN 2026:10.1016/j.sbsr.2026.100972

Shengli Zhou, Yuji Furutani, Kei Yamashita, Sakuya Kako, Kazunori Watanabe, Toshihiko Kiwa, and Takashi Ohtsuki, "Magnetic Detection of Cancer Cells Using Tumor-Homing Peptide-Modified Magnetic Nanoparticles," BIOSENSORS, Vol. 16, (1), 45, JAN 5 2026:10.3390/bios16010045

Mohd Mawardi Saari, Mohd Herwan Sulaiman, Nurul A'in Nadzri, and Toshihiko Kiwa, "A Spline-Enhanced Non-Negative Least Squares inversion approach for estimating magnetic nanoparticle size distribution from magnetization curves," PHYSICA SCRIPTA, Vol. 100, 075989, JUL 2025:10.1088/1402-4896/ade93d

Mohd Mawardi Saari, Mohd Herwan Sulaiman, Nurul A'in Nadzri, and Toshihiko Kiwa, "Hydrodynamic core size extraction of magnetic nanoparticles using non-regularized non-negative inversion of combined real and imaginary magnetic responses," PRZEGLĄD ELEKTROTECHNICZNY, Vol. 5, pp. 26-29, MAY 2025:10.15199/48.2025.05.06

Gang Wang, Zhaokai Li, Wei Ni, Heng Ye, Yang Liu, Linjian Chen, Lin Wang, Changjiang Liu, Jingyu Chen, Xuchao Wang, Xue Ding, Longshan Zhao, Xiaofeng Ge, Yan Wang, Yuanchao Ye, Toshihiko Kiwa, Linghe Zang, Jin Wang, Cuilian Dai, and Binbin Liu, "A small molecule esculetin accelerates postprandial lipid clearance involving activation of C/EBPβ and CD36-mediated phagocytosis by adipose tissue macrophages," THERANOSTICS, Vol. 15, (12), pp. 5910-5930, :10.7150/thno.110207

Masaomi Washino, Kota Nomura, Tetsuya Matsuda, Satoshi Seino, Takashi Nakagawa, and Toshihiko Kiwa, "System function analysis of MPI with Field-Free Line and excitation coil configurations," International Journal on Magnetic Particle Imaging IJMPI, Vol. 11, (1 Suppl 1), 2503014, :10.18416/IJMPI.2025.2503014

Kei Yamashita, Kosuke Naito, Jin Wang, Shogo Kasuda, and Toshihiko Kiwa, "Coagulation testing method using magnetic nanoparticles," JAPANESE JOURNAL OF APPLIED PHYSICS, Vol. 64, (2), 20902, FEB 1 2025:10.35848/1347-4065/adaba5

Kosei Morita, Yuta Mitsuda, Sota Yoshida, Toshihiko Kiwa, and Jin Wang, "Mapping Surface Potential in DNA Aptamer-Neurochemical and Membrane-Ion Interactions on the SOS Substrate Using Terahertz Microscopy," BIOSENSORS-BASEL, Vol. 15, (1), 46, JAN 2025:10.3390/bios15010046

Xue Ding, Mana Murakami, Jin Wang, Hirofumi Inoue, and Toshihiko Kiwa, "Microdetection of Nucleocapsid Proteins via Terahertz Chemical Microscope Using Aptamers," SENSORS, Vol. 24, (22), 7382, NOV 2024:10.3390/s24227382

Mohd Mawardi Saari, Mohd Aufa Hadi Putera Zaini, Mohd Herwan Sulaiman, Ahmad Salihin Samsudin, and Toshihiko Kiwa, "Defect Evaluation in Mild Steel Plate Using Harmonic Ratio Induced by Square Wave Excitation Field and Nonlinear Magnetization," IEEE TRANSACTIONS ON MAGNETICS, Vol. 60, (9), 6200505, SEP 2024:10.1109/TMAG.2024.3420948

Mohd Mawardi Saari, Mohd Herwan Sulaiman, and Toshihiko Kiwa, "Estimation of Core Size Distribution of Magnetic Nanoparticles Using High- T c SQUID Magnetometer and Particle Swarm Optimizer-Based Inversion Technique," IEICE TRANSACTIONS ON ELECTRONICS, Vol. E107C, (6), pp. 176-182, JUN 2024:10.1587/transele.2023SEP0002

Changjiang Liu, Jin Wang, Ryo Negishi, Tatsutoshi Inuzuka, and Toshihiko Kiwa, "Label-Free Measurement of CD63 Positive Extracellular Vesicles Using Terahertz Chemical Microscopy," ACS SENSORS, Vol. 9, (6), pp. 3244-3252, MAY 24 2024:10.1021/acssensors.4c00590

Mohd Aufa Hadi Putera Zaini, Mohd Mawardi Saari, Nurul A'in Nadzri, Zulkifly Aziz, and Toshihiko Kiwa, "Backside Defect Evaluation in Carbon Steel Plate Using a Hybridized Magnetic Flux Leakage and Eddy Current Technique," JOURNAL OF NONDESTRUCTIVE EVALUATION, Vol. 43, (1), 9, MAR 2024:10.1007/s10921-023-01022-z

Satoshi Seino, Hiroto Ikehata, Mizuki Tanabe, Tomohiro Umeda, Takami Tomiyama, Akiko Tanaka, Tomoyuki Furubayashi, Toshiyasu Sakane, Toshihiko Kiwa, Masaomi Washino, Kota Nomura, Shun Tonooka, Akihiro Izawa, Yuki Okumura, and Takashi Nakagawa, "Investigating the efficacy of nasal administration for delivering magnetic nanoparticles into the brain for magnetic particle imaging," JOURNAL OF CONTROLLED RELEASE, Vol. 367, , pp. 515-521, MAR 2024:10.1016/j.jconrel.2024.01.027

Shoki Wakabayashi, Yuki Oh, Haruhito Nakayama, Jin Wang, and Toshihiko Kiwa, "Ultrathin Platinum Film Hydrogen Sensors with a Twin-T Type Notch Filter Circuit," SENSORS, Vol. 24, (2), 548, JAN 2024:10.3390/s24020548

Hiroya Watanabe, Yurin Hishii, Kanna Kishimoto, Kohei Nogami, Qingyuan Ma, Tomoya Niki, Tomoki Kotani, Toshihiko Kiwa, Satoru Shoji, Takahiro Ohkubo, Jun Kano, and Nobuyuki Takeyasu, "Coating Silver Tree-like Fractal Structure with Silica Layer for Inhibiting Chemical Reactions of Analytes in Surface-Enhanced Raman Scattering," PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE, Vol. , , , 2023 SEP 24 2023:10.1002/pssa.202300085

Mohd Mawardi Saari, Nurul A'in Nadzri, Mohd Aufa Hadi Putera Zaini, Mohd Herwan Sulaiman, and Toshihiko Kiwa, "A Circular Eddy Current Probe Using Miniature Fluxgates for Multi-Orientation Slit Evaluation in Steel Components," RUSSIAN JOURNAL OF NONDESTRUCTIVE TESTING, Vol. 59, (8), pp. 902-914, AUG 2023:10.1134/S1061830923600417

Kei Yamashita, Kouhei Kishimoto, Hiroto Kuroda, Jin Wang, Kenji Sakai, Mohd Mawardi Saari, and Toshihiko Kiwa, "Aggregation of Magnetic Nanoparticles in Biological Solvents Evaluated by HTS-SQUID Magnetic Immunoassay System," IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol. 33, (5), 1600405, AUG 2023:10.1109/TASC.2023.3239830

Jin Wang, Kenji Sakai, and Toshihiko Kiwa, "All-in-one terahertz taste sensor: integrated electronic and bioelectronic tongues," SENSORS & DIAGNOSTICS, Vol. 2, (3), pp. 620-626, MAY 19 2023:10.1039/d3sd00038a

Jin Wang, Kosei Morita, Masaki Ando, Sota Yoshida, Hiroki Nagata, Kenji Sakai, and Toshihiko Kiwa, "Terahertz aptasensor for dopamine neurochemical detection," APPLIED PHYSICS EXPRESS, Vol. 16, (5), 52002, MAY 1 2023:10.35848/1882-0786/acd102

Shoya Adachi, Minoru Hayashi, Taisei Kawakami, Yuto Ando, Jin Wang, Kenji Sakai, Toshihiko Kiwa, Toshiyuki Ishikawa, and Keiji Tsukada, "Thickness Measurement at High Lift-Off for Underwater Corroded Iron-Steel Structures Using a Magnetic Sensor Probe," SENSORS, Vol. 23, (1), 380, JAN 2023:10.3390/s23010380

Kota Nomura, Masaomi Washino, Tetsuya Matsuda, Shun Tonooka, Seino Satoshi, H. Yoshida, K. Nishigaki, Takashi Nakagawa, and Toshihiko Kiwa, "Magnetic-Particle-Discrimination Method Using Difference of Relaxation Time for Magnetic Particle Imaging," IEEE MAGNETICS LETTERS, Vol. 14, , 8100105, 2023:10.1109/LMAG.2023.3243493

Mohd Mawardi Saari, Mohd Aufa Hadi Putera Zaini, Ummi Sabihah M. O. H. D. Yusdi, Nurul Ain Nadzri, Mohd Herwan Sulaiman, and Toshihiko Kiwa, "Assessment Of Surface Corrosion On Carbon Steel Plates Using A Differential Fluxgate Probe," PRZEGLAD ELEKTROTECHNICZNY, Vol. 99, (12), pp. 207-210, 2023:10.15199/48.2023.12.37

Jin Wang, Masaki Ando, Hiroki Nagata, Sota Yoshida, Kenji Sakai, and Toshihiko Kiwa, "Multifunctional terahertz microscopy for biochemical and chemical imaging and sensing," BIOSENSORS & BIOELECTRONICS, Vol. 220, , 114901, JAN 15 2023:10.1016/j.bios.2022.114901

Kouhei Kishimoto, Hiroto Kuroda, Misaki Tsubota, Kei Yamashita, Jin Wang, Kenji Sakai, Mohd Mawardi Saari, and Toshihiko Kiwa, "Dispersion of Fe3O4 Nanoparticle Beads Driven by Femtosecond Laser Pulses for Quantitative Magnetic Immunoassay Measurements," ACS APPLIED NANO MATERIALS, , , , 2022 NOV 15 2022:10.1021/acsanm.2c04399

Kohei Nogami, Kanna Kishimoto, Yuki Hashimoto, Hiroya Watanabe, Yurin Hishii, Qingyuan Ma, Tomoya Niki, Tomoki Kotani, Toshihiko Kiwa, Satoru Shoji, Takahiro Ohkubo, Jun Kano, and Nobuyuki Takeyasu, "Self-growth of silver tree-like fractal structures with different geometries," APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, Vol. 128, (10), 860, OCT 2022:10.1007/s00339-022-05976-1

Feroz Ahmed, Masashi Shimizu, Jin Wang, Kenji Sakai, and Toshihiko Kiwa, "Optimization of Microchannels and Application of Basic Activation Functions of Deep Neural Network for Accuracy Analysis of Microfluidic Parameter Data," MICROMACHINES, Vol. 13, (8), 1352, AUG 2022:10.3390/mi13081352

Minoru Hayashi, Taisei Kawakami, Shoya Adachi, Jin Wang, Kenji Sakai, Toshihiko Kiwa, Keiji Tsukada, Yohei Miyamoto, Mikihito Hirohata, and Toshiyuki Ishikawa, "Crack Detection for Welded Joint With Surface Coating Using Unsaturated AC Magnetic Flux Leakage," IEEE TRANSACTIONS ON MAGNETICS, Vol. 58, (8), 6201205, AUG 2022:10.1109/TMAG.2022.3151656

Mohd Mawardi Saari, Mohd Herwan Sulaiman, Hamzah Ahmad, Nurul Akmal Che Lah, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada, "A benchtop induction-based AC magnetometer for a fast characterization of magnetic nanoparticles," ENGINEERING RESEARCH EXPRESS, Vol. 4, (2), 25047, JUN 1 2022:10.1088/2631-8695/ac78c8

Jin Wang, Kenji Sakai, and Toshihiko Kiwa, "Rational Design of Peptides Derived from Odorant-Binding Proteins for SARS-CoV-2-Related Volatile Organic Compounds Recognition," MOLECULES, Vol. 27, (12), 3917, JUN 2022:10.3390/molecules27123917

Keiji Tsukada, Minoru Hayashi, Taisei Kawakami, Shoya Adachi, Kenji Sakai, Toshihiko Kiwa, Toshiyuki Ishikawa, Mohd Mawardi Saari, Kengo Hori, Kazumasa Hisazumi, and Tomonori Tominaga, "Magnetic thickness measurement for various iron steels using magnetic sensor and effect of electromagnetic characteristics," AIP ADVANCES, Vol. 12, (3), 35109, MAR 1 2022:10.1063/9.0000250

Jin Wang, Kosuke Sato, Yuichi Yoshida, Kenji Sakai, and Toshihiko Kiwa, "A Versatile Terahertz Chemical Microscope and Its Application for the Detection of Histamine," PHOTONICS, Vol. 9, (1), 26, JAN 2022:10.3390/photonics9010026

Masashi Shimizu, Ryoji Yamanaka, Takashi Teranishi, Jin Wang, Kenji Sakai, Keiji Tsukada, and Toshihiko Kiwa, "Development of impedance measurement of lithium ion batteries electrode using terahertz chemical microscope," ELECTRICAL ENGINEERING IN JAPAN, Vol. 214, (4), e23355, DEC 2021:10.1002/eej.23355

Jin Wang, Hiroki Nagata, Masaki Ando, Yuichi Yoshida, Kenji Sakai, and Toshihiko Kiwa, "Visualization of Charge-Transfer Complex for the Detection of 2,4,6-Trinitrotoluene Using Terahertz Chemical Microscope," JOURNAL OF THE ELECTROCHEMICAL SOCIETY, Vol. 168, (11), 117517, NOV 1 2021:10.1149/1945-7111/ac3a2c

Yuichi Yoshida, Xue Ding, Kohei Iwatsuki, Katsuya Taniizumi, Hirofumi Inoue, Jin Wang, Kenji Sakai, and Toshihiko Kiwa, "Detection of Lung Cancer Cells in Solutions Using a Terahertz Chemical Microscope," SENSORS, Vol. 21, (22), 7631, NOV 2021:10.3390/s21227631

Sharifun Nahar, Ahmed Mohamed, Xavier Ropagnol, Amir Hassanpour, Toshihiko Kiwa, Tsuneyuki Ozaki, and Marc A. Gauthier, "Noninvasive, label-free, and quantitative monitoring of lipase kinetics using terahertz emission technology," BIOTECHNOLOGY AND BIOENGINEERING, Vol. 118, (11), pp. 4246-4254, NOV 2021:10.1002/bit.27893

Feroz Ahmed, Yuichi Yoshida, Jin Wang, Kenji Sakai, and Toshihiko Kiwa, "Design and validation of microfluidic parameters of a microfluidic chip using fluid dynamics," AIP ADVANCES, Vol. 11, (7), 75224, JUL 1 2021:10.1063/5.0056597

Mohd Mawardi Saari, Mohd Herwan Sulaiman, Nurul Akmal Che Lah, Zulkifly Aziz, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada, "Properties of single- and multi-core magnetic nanoparticles assessed by magnetic susceptibility measurements," JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, Vol. 528, , 167812, JUN 15 2021:10.1016/j.jmmm.2021.167812

Sota Sueda, Tomoya Niki, Kenji Sakai, and Toshihiko Kiwa, "Evaluation of penetration speed of liquids into skin using a terahertz time-of-flight method," JAPANESE JOURNAL OF APPLIED PHYSICS, Vol. 60, (3), 32002, MAR 1 2021:10.35848/1347-4065/abdd03

Feroz Ahmed, Atsuya Mahana, Katsuya Taniizumi, Jin Wang, Kenji Sakai, and Toshihiko Kiwa, "Terahertz imaging technique for monitoring the flow of buffer solutions at different pH values through a microfluidic chip," JAPANESE JOURNAL OF APPLIED PHYSICS, Vol. 60, (2), 27003, FEB 1 2021:10.35848/1347-4065/abd86e

Minoru Hayashi, Taisei Kawakami, Taisuke Saito, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada, "Imaging of Defect Signal of Reinforcing Steel Bar at High Lift-Off Using a Magnetic Sensor Array by Unsaturated AC Magnetic Flux Leakage Testing," IEEE TRANSACTIONS ON MAGNETICS, Vol. 57, (2), 6500204, FEB 2021:10.1109/TMAG.2020.3017722

Mohd Mawardi Saari, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada, "A sensitive magnetometer utilizing high-Tc SQUID for magnetic property characterization," MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS, Vol. 27, (9), pp. 3413-3420, SEP 2021:10.1007/s00542-020-05198-6

Toshihiko Kiwa, Yuki Akiwa, Hayato Fujita, Takashi Teranishi, Kenji Sakai, Hidetoshi Nose, Masaki Kobayashi, and Keiji Tsukada, "Electric Potential Distribution on Lithium Ion Battery Cathodes Measured Using Terahertz Chemical Microscopy," JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES, Vol. 41, (4), pp. 430-437, APR 2020:10.1007/s10762-019-00640-x

Kiyoshi Miyata, Ryota Nagaoka, Masaki Hada, Takanori Tanaka, Ryuji Mishima, Taihei Kuroda, Sota Sueta, Takumi Iida, Yoshifumi Yamashita, Takeshi Nishikawa, Kenji Tsuruta, Yasuhiko Hayashi, Ken Onda, Toshihiko Kiwa, and Takashi Teranishi, "Liquid-like dielectric response is an origin of long polaron lifetime exceeding 10 μs in lead bromide perovskites," JOURNAL OF CHEMICAL PHYSICS, Vol. 152, (8), 84704, FEB 28 2020:10.1063/1.5127993

Kenta Tsunashima, Katsuya Jinno, Bunta Hiramatsu, Kayo Fujimoto, Kenji Sakai, Toshihiko Kiwa, Mohd Mawardi Saari, and Keiji Tsukada, "Laser monitoring of dynamic behavior of magnetic nanoparticles in magnetic field gradient," AIP ADVANCES, Vol. 10, (1), 15025, JAN 2020:10.1063/1.5130167

Katsuya Jinno, Bunta Hiramatsu, Kenta Tsunashima, Kayo Fujimoto, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada, "Magnetic characterization change by solvents of magnetic nanoparticles in liquid-phase magnetic immunoassay," AIP ADVANCES, Vol. 9, (12), 125317, DEC 1 2019:10.1063/1.5130168

Masaki Hada, Taisuke Hasegawa, Hirotaka Inoue, Makito Takagi, Kazuki Omoto, Daiki Chujo, Shogo Iemoto, Taihei Kuroda, Taiga Morimoto, Takuma Hayashi, Toru Iijima, Tomoharu Tokunaga, Naoshi Ikeda, Kazuhiro Fujimori, Chihiro Itoh, Takeshi Nishikawa, Yoshifumi Yamashita, Toshihiko Kiwa, Shin-ya Koshihara, Satoshi Maeda, and Yasuhiko Hayashi, "One-Minute Joule Annealing Enhances the Thermoelectric Properties of Carbon Nanotube Yarns via the Formation of Graphene at the Interface," ACS APPLIED ENERGY MATERIALS, Vol. 2, (10), pp. 7700-7708, OCT 2019:10.1021/acsaem.9b01736

Mohd Mawardi Saari, Nazatul Shareena Suhaimi, Mohd Herwan Sulaiman, Nurul Akmal Che Lah, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada, "Influence of Viscosity on Dynamic Magnetization of Thermally Blocked Iron Oxide Nanoparticles Characterized by a Sensitive AC Magnetometer," JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM, Vol. 32, (9), pp. 2765-2772, SEP 2019:10.1007/s10948-019-5031-6

Tetsuro Hirata, Yuto Goda, Kenji Sakai, Toshihiko Kiwa, Seiji Adachi, Akira Tsukamoto, Tsunehiro Hato, Keiichi Tanabe, and Keiji Tsukada, "Development of a Highly Sensitive Magnetic Field Detector With a Wide Frequency Range for Nondestructive Testing Using an HTS Coil With Magnetic Sensors," IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol. 29, (5), 3500905, AUG 2019:10.1109/TASC.2019.2904485

Minoru Hayashi, Taisuke Saito, Yoshihiro Nakamura, Kenji Sakai, Toshihiko Kiwa, Izumi Tanikura, and Keiji Tsukada, "Extraction Method of Crack Signal for Inspection of Complicated Steel Structures Using A Dual-Channel Magnetic Sensor," SENSORS, Vol. 19, (13), 3001, JUL 1 2019:10.3390/s19133001

Keiji Tsukada, Kenta Tsunashima, Katsuya Jinno, Bunta Hiramatsu, Shun Takeuchi, Kayo Fujimoto, Kenji Sakai, Toshihiko Kiwa, and Mohd Mawardi Saari, "Using Magnetic Field Gradients to Shorten the Antigen-Antibody Reaction Time for a Magnetic Immunoassay," IEEE TRANSACTIONS ON MAGNETICS, Vol. 55, (7), 5100405, JUL 2019:10.1109/TMAG.2019.2894904

Eman M. Hassan, Ahmed Mohamed, Maria C. DeRosa, William G. Willmore, Yuki Hanaoka, Toshihiko Kiwa, and Tsuneyuki Ozaki, "High-sensitivity detection of metastatic breast cancer cells via terahertz chemical microscopy using aptamers," SENSORS AND ACTUATORS B-CHEMICAL, Vol. 287, , pp. 595-601, MAY 15 2019:10.1016/j.snb.2019.02.019

Keiji Tsukada, Tetsuro Hirata, Yuto Goda, Kenji Sakai, and Toshihiko Kiwa, "Hybrid Magnetic Sensor Combined With a Tunnel Magnetoresistive Sensor and High-Temperature Superconducting Magnetic-Field-Focusing Plates," IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol. 29, (3), 8800405, APR 2019:10.1109/TASC.2018.2874354

Toshihiko Kiwa, Tatsuki Kamiya, Taiga Morimoto, Kentaro Fujiwara, Yuki Maeno, Yuki Akiwa, Masahiro Iida, Taihei Kuroda, Kenji Sakai, Hidetoshi Nose, Masaki Kobayashi, and Keiji Tsukada, "Imaging of Chemical Reactions Using a Terahertz Chemical Microscope," PHOTONICS, Vol. 6, (1), 10, JAN 27 2019:10.3390/photonics6010010

Keiji Tsukada, Hiroto Shobu, Yuto Goda, Takumi Kobara, Kenji Sakai, Toshihiko Kiwa, and Mohd Mawardi Saari, "Integrated Magnetic Sensor Probe and Excitation Wire for Nondestructive Detection of Submillimeter Defects," IEEE MAGNETICS LETTERS, Vol. 10, , 8105105, 2019:10.1109/LMAG.2019.2936392

Keiji Tsukada, Minoru Hayashi, Yoshihiro Nakamura, Kenji Sakai, and Toshihiko Kiwa, "Small Eddy Current Testing Sensor Probe Using a Tunneling Magnetoresistance Sensor to Detect Cracks in Steel Structures," IEEE TRANSACTIONS ON MAGNETICS, Vol. 54, (11), 6202205, NOV 2018:10.1109/TMAG.2018.2845864

Keiji Tsukada, Takuya Tomioka, Shunki Wakabayashi, Kenji Sakai, and Toshihiko Kiwa, "Magnetic Detection of Steel Corrosion at a Buried Position Near the Ground Level Using a Magnetic Resistance Sensor," IEEE TRANSACTIONS ON MAGNETICS, Vol. 54, (11), 6202104, NOV 2018:10.1109/TMAG.2018.2833852

Ryota Isshiki, Yuta Nakamura, Shun Takeuchi, Tetsuro Hirata, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada, "Evaluation of the Magnetization Properties of Magnetic Nanoparticles in Serum Using HTS-SQUID," IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol. 28, (4), 1600605, JUN 2018:10.1109/TASC.2018.2795619

Yuta Nakamura, Ryota Isshiki, Shun Takeuchi, Tetsuro Hirata, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada, "Sensitivity Improvement of Sample Rotation Measurement Method in HTS-SQUID Magnetometer for Diamagnetic Materials," IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol. 28, (4), 1601604, JUN 2018:10.1109/TASC.2018.2810088

Kenji Sakai, Tsubasa Kizu, Toshihiko Kiwa, and Keiji Tsukada, "Analysis of AC Impedance in Localized Region Using Magnetic Field Distribution Measured by HTS-SQUID," IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol. 28, (4), 1600905, JUN 2018:10.1109/TASC.2018.2796609

Mohd Mawardi Saari, Nurul Akmal Che Lah, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada, "Harmonics distribution of iron oxide nanoparticles solutions under diamagnetic background," JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, Vol. 452, , pp. 145-152, APR 15 2018:10.1016/j.jmmm.2017.12.054

Toshihiko Kiwa, Tatsuki Kamiya, Taiga Morimoto, Kenji Sakai, and Keiji Tsukada, "pH measurements in 16-nL-volume solutions using terahertz chemical microscopy," OPTICS EXPRESS, Vol. 26, (7), pp. 8232-8238, APR 2 2018:10.1364/OE.26.008232

Keiji Tsukada, Yatsuse Majima, Yoshihiro Nakamura, Takuya Yasugi, Nannan Song, Kenji Sakai, and Toshihiko Kiwa, "Detection of Inner Cracks in Thick Steel Plates Using Unsaturated AC Magnetic Flux Leakage Testing With a Magnetic Resistance Gradiometer," IEEE TRANSACTIONS ON MAGNETICS, Vol. 53, (11), 2501305, NOV 2017:10.1109/TMAG.2017.2713880

Toshihiko Kiwa, Koji Morita, Yasuaki Matsunaga, Mohd Mawardi Saari, Kenji Sakai, and Keiji Tsukada, "High-Resolution Laser-Assisted Magnetic Nanoparticle Imaging Using a High-TC SQUID Magnetometer," IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol. 27, (4), 1601804, JUN 2017:10.1109/TASC.2017.2656118

Yasuaki Matsunaga, Ryota Isshiki, Yuta Nakamura, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada, "Application of a HTS Coil With a Magnetic Sensor to Nondestructive Testing Using a Low-Frequency Magnetic Field," IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol. 27, (4), 1800304, JUN 2017:10.1109/TASC.2016.2631420

Kenji Sakai, Tsubasa Kizu, Toshihiko Kiwa, and Keiji Tsukada, "Magnetic AC Impedance Analysis Method Using High-Tc SQUID Based Magnetic Measurement System," IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol. 27, (4), 1601205, JUN 2017:10.1109/TASC.2016.2631426

Keiji Tsukada, Takuya Yasugi, Yatsuse Majima, Kenji Sakai, and Toshihiko Kiwa, "Absolute-magnetic-field measurement using nanogranular in-gap magnetic sensor with second-harmonic and liquid-nitrogen-temperature operation," AIP ADVANCES, Vol. 7, (5), 56670, MAY 2017:10.1063/1.4978217

Keiji Tsukada, Yasuaki Matsunaga, Ryota Isshiki, Yuta Nakamura, Kenji Sakai, and Toshihiko Kiwa, "Magnetic characteristics measurements of ethanol-water mixtures using a hybrid-type high-temperature superconducting quantum-interference device magnetometer," AIP ADVANCES, Vol. 7, (5), 56707, MAY 2017:10.1063/1.4973950

Kenji Sakai, Kohei Tanaka, Toshihiko Kiwa, and Keiji Tsukada, "Current distribution evaluation of dye-sensitized solar cell using HTS-SQUID-based magnetic measurement system," PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, Vol. 530, , pp. 113-116, NOV 15 2016:10.1016/j.physc.2016.04.002

Keiji Tsukada, Yuta Haga, Koji Morita, Nannan Song, Kenji Sakai, Toshihiko Kiwa, and Weiying Cheng, "Detection of Inner Corrosion of Steel Construction Using Magnetic Resistance Sensor and Magnetic Spectroscopy Analysis," IEEE TRANSACTIONS ON MAGNETICS, Vol. 52, (7), 6201504, JUL 2016:10.1109/TMAG.2016.2530851

Takuya Kuwana, Masahiro Ogawa, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada, "Label-free detection of low-molecular-weight samples using a terahertz chemical microscope," APPLIED PHYSICS EXPRESS, Vol. 9, (4), 42401, APR 2016:10.7567/APEX.9.042401

Keiji Tsukada, Koji Morita, Yasuaki Matsunaga, Mohd Mawardi Saari, Kenji Sakai, and Toshihiko Kiwa, "Hybrid Type HTS-SQUID Magnetometer With Vibrating and Rotating Sample," IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol. 26, (3), 1601405, APR 2016:10.1109/TASC.2016.2531632

Ryuki Takagi, Mohd Mawardi Saari, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada, "Compact AC/DC Susceptometer Using a High-Temperature Superconducting Quantum Interference Device," ELECTRONICS AND COMMUNICATIONS IN JAPAN, Vol. 99, (3), pp. 31-37, MAR 2016:10.1002/ecj.11779

Daichi Hamasaki, Naohiro Okamoto, Mohd Mawardi Saari, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada, "Improvement of Sensitivity of a Compact Magnetometer by Using HTS-SQUID with Rotating Sample," ELECTRICAL ENGINEERING IN JAPAN, Vol. 194, (2), pp. 9-14, JAN 2016:10.1002/eej.22732

Mohd Mawardi Saari, Yuya Tsukamoto, Toki Kusaka, Yuichi Ishihara, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada, "Effect of diamagnetic contribution of water on harmonics distribution in a dilute solution of iron oxide nanoparticles measured using high-Tc SQUID magnetometer," JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, Vol. 394, , pp. 260-265, NOV 15 2015:10.1016/j.jmmm.2015.06.090

Kenji Sakai, Koji Morita, Yuta Haga, Toshihiko Kiwa, Katsumi Inoue, and Keiji Tsukada, "Automatic Scanning System for Back-Side Defect of Steel Structure Using Magnetic Flux Leakage Method," IEEE TRANSACTIONS ON MAGNETICS, Vol. 51, (11), 6202103, NOV 2015:10.1109/TMAG.2015.2453211

Toshihiko Kiwa, Kohei Tanaka, Shohei Kasuya, Kenji Sakai, and Keiji Tsukada, "Ion Transportation of Electrolytes in a Flow Channel Mapped by an HTS SQUID Scanning System," IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol. 25, (3), 1602204, JUN 2015:10.1109/TASC.2014.2382656

Mohd Mawardi Saari, Yuichi Ishihara, Yuya Tsukamoto, Toki Kusaka, Koji Morita, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada, "Optimization of an AC/DC High-Tc SQUID Magnetometer Detection Unit for Evaluation of Magnetic Nanoparticles in Solution," IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol. 25, (3), 1601404, JUN 2015:10.1109/TASC.2014.2363633

Kenji Sakai, Naohiro Okamoto, Yuuta Watanabe, Mohd Saari, Toshihiko Kiwa, and Keiji Tsukada, "Moisture Content Evaluation Using Improved High-Tc SQUID-Based Rotating-Sample Magnetometer," IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol. 25, (3), 1601205, JUN 2015:10.1109/TASC.2014.2363353

Mohd Mawardi Saari, Kenji Sakai, Toshihiko Kiwa, T. Sasayama, T. Yoshida, and Keiji Tsukada, "Characterization of the magnetic moment distribution in low-concentration solutions of iron oxide nanoparticles by a high-Tc superconducting quantum interference device magnetometer," JOURNAL OF APPLIED PHYSICS, Vol. 117, (17), 17B321, MAY 7 2015:10.1063/1.4919043

Kosuke Akimune, Yuki Okawa, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada, "Multi-ion sensing of buffer solutions using terahertz chemical microscopy," APPLIED PHYSICS EXPRESS, Vol. 7, (12), 122401, DEC 2014:10.7567/APEX.7.122401

Toshihiko Kiwa, Shinogo Miyazaki, Mohd M. Saari, Kenji Sakai, Akira Tsukamoto, Seiji Adachi, Tsunehiro Hato, Keiichi Tanabe, and Keiji Tsukada, "Visualization of ion transportation in an electrolyte using an HTS-SQUID gradiometer," PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, Vol. 504, , pp. 84-87, SEP 15 2014:10.1016/j.physc.2014.04.024

Keiji Tsukada, Shuzo Takeichi, Kenji Sakai, and Toshihiko Kiwa, "Ultrathin-film hydrogen gas sensor with nanostructurally modified surface," JAPANESE JOURNAL OF APPLIED PHYSICS, Vol. 53, (7), 76701, JUL 2014:10.7567/JJAP.53.076701

Keiji Tsukada, Toki Kusaka, Mohd Mawardi Saari, Ryuki Takagi, Kenji Sakai, Toshihiko Kiwa, and Y. Bito, "Magnetic susceptibility and magnetic resonance measurements of the moisture content and hydration condition of a magnetic mixture material," JOURNAL OF APPLIED PHYSICS, Vol. 115, (17), , MAY 7 2014:10.1063/1.4852075

Toshihiko Kiwa, Kenji Sakai, and Keiji Tsukada, "Stabilization method for signal drifts in terahertz chemical microscopy," OPTICS EXPRESS, Vol. 22, (2), pp. 1330-1335, JAN 27 2014:10.1364/OE.22.001330

Toshihiko Kiwa, Yohei Fukudome, Shingo Miyazaki, Mohd Mawardi Saari, Kenji Sakai, and Keiji Tsukada, "Magnetic evaluation of a solar panel using HTS-SQUID," PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, Vol. 494, , pp. 195-198, NOV 2013:10.1016/j.physc.2013.04.080

Toshihiko Kiwa, Akira Tenma, Shinji Takahashi, Kenji Sakai, and Keiji Tsukada, "Label free immune assay using terahertz chemical microscope," SENSORS AND ACTUATORS B-CHEMICAL, Vol. 187, , pp. 8-11, OCT 2013:10.1016/j.snb.2012.08.051

Keiji Tsukada, Kousuke Miyake, Daichi Harada, Kenji Sakai, and Toshihiko Kiwa, "Magnetic Nondestructive Test for Resistance Spot Welds Using Magnetic Flux Penetration and Eddy Current Methods," JOURNAL OF NONDESTRUCTIVE EVALUATION, Vol. 32, (3), pp. 286-293, SEP 2013:10.1007/s10921-013-0181-0

Toshihiko Kiwa, Yohei Fukudome, Shingo Miyazaki, Mohd Mawardi Saari, Kenji Sakai, Akira Tsukamoto, Seiji Adachi, Keiichi Tanabe, Akihiko Kandori, and Keiji Tsukada, "Magnetic Detection of Currents in an Electrolytic Cell Using High-TC SQUID," IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol. 23, (3), 1600804, JUN 2013:10.1109/TASC.2012.2228736

Mohd Mawardi Saari, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada, "Optimization of the Detection Technique for a Vibrating-Sample Magnetometer Using High-Tc SQUID," IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol. 23, (3), 1600204, JUN 2013:10.1109/TASC.2012.2227919

Kenji Sakai, Mohd Mawardi Saari, Toshihiko Kiwa, and Keiji Tsukada, "Compact Rotating-Sample Magnetometer for Relaxation Phenomenon Measurement Using HTS-SQUID," IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, Vol. 23, (3), 1601904, JUN 2013:10.1109/TASC.2012.2234324

Toshihiko Kiwa, Takafumi Hagiwara, Mitsuhiro Shinomiya, Kenji Sakai, and Keiji Tsukada, "Work function shifts of catalytic metals under hydrogen gas visualized by terahertz chemical microscopy," OPTICS EXPRESS, Vol. 20, (11), pp. 11637-11642, MAY 21 2012:10.1364/OE.20.011637

Mohd Mawardi Saari, Kenji Sakai, Toshihiko Kiwa, Akira Tsukamoto, Seiji Adachi, Keiichi Tanabe, Akihiko Kandori, and Keiji Tsukada, "Development of a Compact Moving-Sample Magnetometer Using High-Tc Superconducting Quantum Interference Device," JAPANESE JOURNAL OF APPLIED PHYSICS, Vol. 51, (4), 46601, APR 2012:10.1143/JJAP.51.046601

Kenji Sakai, Mohd Mawardi Saari, Toshihiko Kiwa, Akira Tsukamoto, Seiji Adachi, Keiichi Tanabe, Akihiko Kandori, and Keiji Tsukada, "Development of a compact DC magnetometer using HTS-SQUID and a rotating sample," SUPERCONDUCTOR SCIENCE & TECHNOLOGY, Vol. 25, (4), 45005, APR 2012:10.1088/0953-2048/25/4/045005

Keiji Tsukada, Kenji Sakai, and Toshihiko Kiwa, "Electric Characteristics of a Loop in Which Two Junctions between a Catalytic Metal and a Noncatalytic Metal Are under Different Hydrogen Gas Concentrations," APPLIED PHYSICS EXPRESS, Vol. 5, (3), 34102, MAR 2012:10.1143/APEX.5.034102

Keiji Tsukada, Hirotsugu Inoue, Fumiya Katayama, Kenji Sakai, and Toshihiko Kiwa, "Changes in Work Function and Electrical Resistance of Pt Thin Films in the Presence of Hydrogen Gas," JAPANESE JOURNAL OF APPLIED PHYSICS, Vol. 51, (1), 15701, JAN 2012:10.1143/JJAP.51.015701

Toshihiko Kiwa, Satoshi Maeda, Kousuke Miyake, N. Kataoka, Akira Tsukamoto, Seiji Adachi, Keiichi Tanabe, Akihiko Kandori, and Keiji Tsukada, "Differential conductivity mapping of solar panels using a high-TC superconductor SQUID," PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, Vol. 471, (21-22), pp. 1238-1241, NOV 2011:10.1016/j.physc.2011.05.168