Papers

・Review ・Invited talk ・Int'l conf. ・Domestic conf. ・Press release ・Awards ・Exhibition

2019

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, Yasuhiko Hayashi
One-Minute Joule Annealing Enhances the Thermoelectric Properties of Carbon Nanotube Yarns via the Formation of Graphene at the Interface
ACS Appl. Energy Mater. 2, pp. 7700-7708, 2019.10

Tetsuro Hirata, Yuto Goda, Kenji Sakai, Toshihiko Kiwa, Seiji Adachi, Akira Tsukamoto, Tsunehiro Hato, Keiichi Tanabe, 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, No. 5, 3500905, 2019.8

Keiji Tsukada, Tetsuro Hirata, Yuto Goda, Kenji Sakai, 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, No. 3, 8800405, 2019.4

E. M.Hassan, A. Mohamed, M. C.DeRos, W. G.Willmore, Y. Hanaoka, T. Kiwa, T. Ozaki
High-sensitivity detection of metastatic breast cancer cells via Terahertz chemical microscopy using aptamers
Sensors & Actuators: B. Chemical, Vo. 287, pp. 595-601, 2019

紀和 利彦, 神谷 樹, 飯田 将弘, 井上 博文, 堺 健司, 豊岡 伸一, 塚田 啓二,
テラヘルツ波ケミカル顕微鏡を用いた生体関連物質評価法
日本レーザー医学会誌,39巻,4号,p.341-346,2019.1.15

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, 6 (1), 10, 2019

2018

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, No. 11, 6202104, 2018.11

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, No. 11, 6202205, 2018.11

Yatsuse Majima, Yoshihiro Nakamura, Kenji Sakai, Toshihiko Kiwa, Keiji Tsukada
Thickness Measurements Using Extremely Low Frequency Eddy Current Testing via TMR Sensors Operated with AC Modulation
Electromagnetic Non-Destructive Evaluation (XXI), Vol. 43, pp. 199-204, 2018

Tsuyoshi Goda, Yuta Haga, Takuya Tomioka, Kenji Sakai, Toshihiko Kiwa, Keiji Tsukada
Characterizing of Corrosion Backside of Steel Plates Using Extremely Low-Frequency Eddy Current Testing with Multiple-Frequency Magnetic-Field Exposure
Electromagnetic Non-Destructive Evaluation (XXI), Vol. 43, pp. 130-135, 2018

Kenji Sakai, Takahiro Ito, Toshihiko Kiwa, Keiji Tsukada
Evaluation of Hardened and Non-Hardened Regions Using Eddy Current Testing
Electromagnetic Non-Destructive Evaluation (XXI), Vol. 43, pp. 1-8, 2018

Y Nakamura, R Isshiki, S Takeuchi, T Hirata, K Sakai, T Kiwa, and K Tsukada
Sensitivity Improvement of Sample Rotation Measurement Method in HTS-SQUID Magnetometer for Diamagnetic Materials
IEEE Transactions on Applied Superconductivity, Vol. 28, Issue 4, 1600905, 2018.6

R Isshiki, Y Nakamura, S Takeuchi, T Hirata, K Sakai, T Kiwa, K Tsukada
Evaluation of the magnetization properties of magnetic nanoparticles in serum using HTS-SQUID
IEEE Transactions on Applied Superconductivity, Vol. 28, Issue 4, 1600605, 2018.6

K Sakai, T Kizu, T Kiwa, K Tsukada
Analysis of AC Impedance in Localized Region Using Magnetic Field Distribution Measured by HTS-SQUID
IEEE Transactions on Applied Superconductivity, Vol. 28, Issue 4, 1600905, 2018.6

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, Issue 7, pp. 8232-8238, 2018.4

M. M Saari, NAC Lah, K Sakai, T Kiwa, K Tsukada
Harmonics distribution of iron oxide nanoparticles solutions under diamagnetic background
Journal of Magnetism and Magnetic Materials, Vol. 452, pp. 145-152, 2018.4

Tetsuro Hirata, Yoshihiro Nakamura, Yatsuse Majima, Kaoru Amano, Kenji Sakai, Toshihiko Kiwa, Keiji Tsukada
Magnetic response characteristics of magneto resistive sensors with superconducting magnetic focusing thin film
International Journal of Engineering and Innovative Technology, Vol. 7 , Issue 7, pp. 9-12, 2018.1

Kaoru Amano, Ryo Furukawa, Kenji Sakai, Toshihiko Kiwa, Keiji Tsukada
Development of bridge-type hydrogen sensor using Pt ultra-thin film
International Journal of Engineering and Innovative Technology, Vol. 7 , Issue 7, pp. 5-8, 2018.1

Shun Takeuchi, Tetsuro Hirata, RyotaIsshiki, Yuta Nakamura, Kayo Fujimoto, Kenji Sakai, Toshihiko Kiwa, Keiji Tsukada
Evaluation of Serum Influence on Magnetic Immunoassay using Magnetic Nanoparticles
International Journal of Engineering and Innovative Technology, Vol. 7 , Issue 7, pp. 1-4, 2018.1

M. M Saari, NS Suhaimi, S Razali, NAC Lah, K Sakai, T Kiwa, K Tsukada
Development of A Resonant Excitation Coil of AC Magnetometer for Evaluation of Magnetic Fluid
Journal of Telecommunication, Electronic and Computer Engineering, Vol. 10, No, 1-2, pp. 127-130, 2018

2017

K. Tsukada, Y. Majima, Y. Nakamura, T. Yasugi, N. Song, K. Sakai, and T. Kiwa
Detection of Inner Cracks in Thick Steel Plates Using Unsaturated AC Magnetic Flux Leakage TestingWith a Magnetic Resistance Gradiometer
IEEE TRANSACTIONS ON MAGNETICS, Vol. 53, No. 11, 2501305, 2017.11

T. Kiwa, K. Morita, Y. Matsunaga, M. M. Saari, K. Sakai, and K. Tsukada
High-Resolution Laser-Assisted Magnetic Nanoparticle Imaging Using a High-T-C SQUID Magnetometer
IEEE Transactions on Applied Superconductivity, Vol. 27, No. 4, 1601804, 2017.7

Y. Matsunaga, R. Isshiki, Y. Nakamura, K. Sakai, T. Kiwa, and K. 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, No. 4, 1800304, 2017.7

K. Sakai, T. Kizu, T. Kiwa, and K. Tsukada
Magnetic AC Impedance Analysis Method Using High-T-c SQUID Based Magnetic Measurement System
IEEE Transactions on Applied Superconductivity, Vol. 27, No. 4, 1601205, 2017.7

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, 056670, 2017

K Tsukada, Y Majima, Y Nakamura, T Yasugi, N Song, K Sakai, T 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, No. 11, 2501305, 2017.6

K Tsukada, Y Matsunaga, R Isshiki, Y Nakamura, K Sakai, T Kiwa
Magnetic characteristics measurements of ethanol–water mixtures using a hybrid-type high-temperature superconducting quantum-interference device magnetometer
AIP Advances, Vol. 7, 056707, 2017.1

2016

Kenji Sakai, Kohei Tanaka, Toshihiko Kiwa, 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, 2016.11

Keiji Tsukada, Yasuaki Matsunaga, Yuta Nakamura, Ryota Isshiki, Kayo Fujimoto, Kenji Sakai and Toshihiko Kiwa
Magnetic method for measuring moisture content using diamagnetic characteristic of water
Measurement Science and Technology, Vol. 28, No. 7, 014010, 2017. 1

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 No. 7 6201504 2016.7

Nannan Song, Keisyu SHIGA, Kenji Sakai, Toshihiko Kiwa, and Keiji Tsukada
Development of a Magnetic Phase Map for Analysis of the Internal Structure of a Spot Weld
Electromagnetic Nondestructive Evaluation (XIX), Vol. 41, , pp. 302-311, 2016.6

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, 26 No.3 2016.4

菅井 良祐, 堺 健司, 紀和 利彦, 塚田 啓二
電気化学インピーダンス法を用いた塩素イオンセンサ
電気学会論文誌EVol. 136 No. 4 pp102-107 2016.4

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 No. 4 042401 2016.3

2015

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, No. 11, 6202103, 2015. 11

M. M. Saari, Y. Tsukamoto, T. Kusaka, Y. Ishihara, K. Sakai, T. Kiwa, and K. Tsukada
Effect of diamagnetic contribution of water on harmonics distribution in a dilute solution of iron oxide nanoparticles measured using high-T-c SQUID magnetometer
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, Vol. 394, , pp. 260-265, 2015. 11

K. Sakai, T. Yamamoto, R. Sugai, T. Kiwa, and K. Tsukada
Development of a Planar Type Ion Sensor for Urine Testing
SENSOR LETTERS, Vol. 13, , pp. 1-5, 2015

Shuzo Takeichi, Yuki Ushita, Ryosuke Sugai, Kenji Sakai, Toshihiko Kiwa and Keiji Tsukada
Impedance Evaluation of Hydrogen Sensor Using Ultrathin Platinum Film
Transactions of the Materials Research Society of Japan , Vol. 40, No. 1, pp. 69-72, 2015

M. M. Saari, K. Sakai, T. Kiwa, T. Sasayama, T. Yoshida, and K. Tsukada
Characterization of the magnetic moment distribution in low-concentration solutions of iron oxide nanoparticles by a high-T-c superconducting quantum interference device magnetometer
JOURNAL OF APPLIED PHYSICS , vol. 117, no. 17, 17B321 , 2015. 5

2014

紀和 利彦,堺 健司,塚田 啓二
磁気抵抗効果センサを用いた非破壊検査 (特集 高感度磁気センサの非破壊検査への応用)
非破壊検査, Vol. 63, No. 11, pp. 578-585, 2014. 11

K. Akimune, Y. Okawa, K. Sakai, T. Kiwa, K. Tsukada,
Multi-ion sensing of buffer solutions using terahertz chemical microscopy
APPLIED PHYSICS EXPRESS, Vol. 7 , No. 2, 122401, 2014.12

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, no. 3, 1602204, 2014.10

M. M. Saari, Y. Ishihara, Y. Tsukamoto, T. Kusaka, K. Morita, K. Sakai, T. Kiwa, and K. 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, no. 3, 1601404, 2014.10

Kenji Sakai, Naohiro Okamoto, Yuuta Watanabe, Mohd Mawardi Saari, T. Kiwa, and K. Tsukada
Moisture Content Evaluation Using Improved High-Tc SQUID-Based Rotating-Sample Magnetometer
IEEE Transactions on Applied Superconductivity, vol. 25, no. 3, 1601205, 2014.10

原田 大地,堺 健司,紀和 利彦,塚田 啓二
三層鋼板スポット溶接の磁気を用いた非破壊検査
非破壊検査, Vol. 63, No. 9, pp. 491-492, 2014.9

T. Kiwa, S. Miyazaki, M. M. Saari, K. Sakai, A. Tsukamoto, S. Adachi, T. Hato, K. Tanabe, K. Tsukada
Visualization of ion transportation in an electrolyte using an HTS-SQUID gradiometer
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, Vol. 504, , pp. 84-87, 2014.9

奥井 貴博,牛田 祐貴,武市 修蔵,堺 健司, 紀和 利彦,塚田 啓二
パルス電流印加ゲート構成によるFET水素センサの 応答特性の高速化
電気学会論文誌E, Vol. 134, No. 8, pp. 264-269 , 2014.8

K. Tsukada, S. Takeichi, K. Sakai, T. Kiwa
Ultrathin-film hydrogen gas sensor with nanostructurally modified surface
JAPANESE JOURNAL OF APPLIED PHYSICS, vol. 53, no. 7, 076701, 2014.7

髙木 竜輝, Mohd Mawardi Saari, 堺 健司, 紀和 利彦, 塚田 啓二
HTS-SQUIDを用いたAC/DC複合型小型磁化率計
電気学会論文誌A, Vol. 134, No. 6, pp. 369-374, 2014.6

濵﨑 大地,岡本 直大,Mohd Mawardi Saari,堺 健司,紀和 利彦,塚田 啓二
HTS-SQUID を用いたサンプル回転方式小型磁化率計の高感度化
電気学会論文誌A, Vol. 134, No. 5, pp. 347-351, 2014.5

M. M. Saari, R. Takagi, T. Kusaka, Y. Ishihara, Y. Tsukamoto, K. Sakai, T. Kiwa, and K. Tsukada
Development of integrated AC-DC magnetometer using high- T c SQUID for magnetic properties evaluation of magnetic nanoparticles in solution
Journal of Physics: Conference Series, Vol. 507, No.4, 042035, 2014.5

K. Tsukada, T. Kusaka, M. M. Saari, R. Takagi, K. Sakai, T. 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, No. 17, 17E301, 2014.5

Toshihiko Kiwa, Kenji Sakai, and Keiji Tsukada
Stabilization method for signal drifts in terahertz chemical microscopy
Optics Express, Vol. 22, Issue 2, pp. 1330-1335, 2014.1

2013

小森達也、山本貴文、小田和代、堺健司、紀和利彦、塚田啓二新型構造ナトリウムイオンセンサの開発および応答解析電気学会論文誌E,Vol. 133,No. 7,pp.309-313,2013

圓福敬二,神鳥明彦,安達成司,塚田啓二,田中三郎高温超伝導SQUIDを用いた先端バイオ・非破壊センシング技術の開発低温工学,vol. 48,No. 1,pp. 4-11,2013

Keiji Tsukada, Kousuke Miyake, Daichi Harada, Kenji Sakai, Toshihiko KiwaMagnetic Nondestructive Test for Resistance Spot Welds Using Magnetic Flux Penetration and Eddy Current MthodsJournal of Nondestctive Evaluation, vol. 32, pp. 286-293, 2013

Toshihiko Kiwa, Akira Tenma, Shinji Takahashi, Kenji Sakai, Keiji TsukadaLabel free immune assay using terahertz chemical microscope Sensors and Actuators B: ChemicalVol. 187, pp. 8-11, 2013

Mohd Mawardi Saari,Kenji Sakai, Toshihiko Kiwa, and Keiji TsukadaOptimization of the Detection Technique for a Vibrating-Sample Magnetometer Using High-Tc SQUID IEEE Transactions on Applied Superconductivity, Vol. 12, Issue 3, 1600204, 2013

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- SQUID IEEE Transactions on Applied Superconductivity, Vol. 12, Issue 3, 1600804, 2013

Kenji Sakai, Mohd Mawardi Saari, Toshihiko Kiwa, and Keiji Tsukada Compact Rotating-Sample Magnetometer for Relaxation Phenomenon Measurement Using HTS-SQUIDIEEE Transactions on Applied Superconductivity, Vol. 12, Issue 3, 1601904, 2013

Toshihiko Kiwa, Yohei Fukudome, Shingo Miyazaki, Mohd Mawardi Saari, Kenji Sakai, Keiji TsukadaMagnetic Evaluation of a solar panel using HTS-SQUIDPhysica C, Vol. 494, pp. 195-198, 2013

2012

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, , 015701, 2012

Keiji Tsukada, Kenji Sakai, and Toshihiko Kiwa Electric Characteristics of a Loop in Which Two Junctions between a Catalytic Metal APPLIED PHYSICS EXPRESS, Vol. 5, , 034102, 2012

K Sakai, M M Saari, T Kiwa, A Tsukamoto, S Adachi, K Tanabe, A Kandori and K Tsukada Development of a compact DC magnetometer using HTS-SQUID and a rotating sample SUPERCONDUCTOR SCIENCE AND TECHNOLOGY, Vol. 25, , 045005, 2012

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, Iss. 11, pp. 11637-11642, 2012

Mohd Mawardi Saari,Kenji Sakai, Toshihiko Kiwa, Akira Tsukamoto, Seiji Adachi, Keiichi Tanabe, and Keiji TsukadaDevelopment of a Compact Moving-Sample Magnetometer Using High-Tc Superconducting Quantum Inteference Device Japanese Journal of Applied Physics, Vol. 51, 046601, 2012

2011

K. Ogata, A. Kandori, T. Miyashita, K. Sekihara, and K. Tsukada A comparison of two-dimensional techniques for converting magnetocardiogram maps into effective current source Review of Scientific Instruments, Vol. 82, No.1, pp.014302-8, 2011.1

Keiji Tsukada, Mitsuteru Yoshioka, Toshihiko Kiwa, Yoshinobu Hirano A magnetic flux leakage method using a magnetoresistive sensor for nondestructive evaluation of spot welds NDT&E International, Vol. 44, No. 1, pp.101-105, 2011.1

T. Kiwa, S. Maeda, K. Miyake, N. Kataoka, A. Tsukamoto, S. Adachi, K. Tanabe, A. Kandori, K. Tsukada Differential conductivity mapping of solar panels using a high-Tc superconductor SQUID Phsyica C, Vol. 471, , pp.1238-1241, 2011

2010

Keiji Tsukada, Masatoshi Kariya, Tomiharu Yamaguchi, Toshihiko Kiwa, Hironobu Yamada, Tsuneyoshi Maehara, Tadayoshi Yamamoto, and Shinsuke Kunitsugu Dual-Gate Field-Effect Transistor Hydrogen Gas Sensor with Thermal Compensation Japanese Journal of Applied Physics, Vol. 49, No. 2, 24206, 2010 T.

Kiwa, T. Yamaguchi, K. Tsubota, W. Naruyama, H. Yamada and K. Tsukada Hydrogen gas diffusion imaging using multiple FET type gas sensors Int. J. Advanced Mechatronic System,, Vol. 2, No.4, pp.219-224, 2010

Keiji Tsukada, Mitsuteru Yoshioka, Yoshihiko Kawasaki, Toshihiko Kiwa Detectionofback-sidepitonaferrousplatebymagneticfluxleakagemethod with analyzingmagneticfieldvector NDT & E International, Vol.43, No. 4, pp. 323-328, 2010