Kohei Fujiwara

2023

A Noble-Metal-Free Spintronic System with Proximity-Enhanced Ferromagnetic Topological Surface State of FeSi above Room Temperature

Hori, T., Kanazawa, N., Hirayama, M., Fujiwara, K., Tsukazaki, A., Ichikawa, M., Kawasaki, M. & Tokura, Y., 2023 1月 19, In: Advanced Materials. 35, 3, 2206801.

研究成果: Article › 査読

2022

A large unidirectional magnetoresistance in Fe-Sn heterostructure devices

Shiogai, J., Fujiwara, K., Nojima, T. & Tsukazaki, A., 2022 8月 1, In: Japanese journal of applied physics. 61, 8, 083001.

研究成果: Article › 査読

Electrical detection of domain evolution in magnetic Weyl semimetal Co3Sn2 S2 submicrometer-wide wire devices

Shiogai, J., Ikeda, J., Fujiwara, K., Seki, T., Takanashi, K. & Tsukazaki, A., 2022 11月, In: Physical Review Materials. 6, 11, 114203.

研究成果: Article › 査読

1 被引用数 (Scopus)

Improvement of the detectivity in an Fe-Sn magnetic-field sensor with a large current injection

Shiogai, J., Jin, Z., Satake, Y., Fujiwara, K. & Tsukazaki, A., 2022 5月, In: Japanese journal of applied physics. 61, SC, SC1069.

研究成果: Article › 査読

1 被引用数 (Scopus)

L 2₁ordering of Co₂FeSn thin films promoted by high-temperature annealing

Fujiwara, K., Shibata, K., Nishimura, S., Shiogai, J. & Tsukazaki, A., 2022 6月 1, In: AIP Advances. 12, 6, 065030.

研究成果: Article › 査読

Open Access

Non-volatile chirality switching by all-optical magnetization reversal in ferromagnetic Weyl semimetal Co₃Sn₂S₂

Yoshikawa, N., Ogawa, K., Hirai, Y., Fujiwara, K., Ikeda, J., Tsukazaki, A. & Shimano, R., 2022 12月, In: Communications Physics. 5, 1, 328.

研究成果: Article › 査読

Open Access

2021

Critical thickness for the emergence of Weyl features in Co₃Sn₂S₂ thin films

Ikeda, J., Fujiwara, K., Shiogai, J., Seki, T., Nomura, K., Takanashi, K. & Tsukazaki, A., 2021 12月, In: Communications Materials. 2, 1, 18.

研究成果: Article › 査読

Open Access

14 被引用数 (Scopus)

Electrostatic carrier doping of charge-ordered YbFe₂O₄thin films using ionic liquids

Fujiwara, K., Hori, T. & Tanaka, H., 2021 8月, In: Applied Physics Express. 14, 8, 083001.

研究成果: Article › 査読

Emergence of spin-orbit coupled ferromagnetic surface state derived from Zak phase in a nonmagnetic insulator FeSi

Ohtsuka, Y., Kanazawa, N., Hirayama, M., Matsui, A., Nomoto, T., Arita, R., Nakajima, T., Hanashima, T., Ukleev, V., Aoki, H., Mogi, M., Fujiwara, K., Tsukazaki, A., Ichikawa, M., Kawasaki, M. & Tokura, Y., 2021 11月, In: Science Advances. 7, 47, eabj0498.

研究成果: Article › 査読

1 被引用数 (Scopus)

First-principles investigation of magnetic and transport properties in hole-doped shandite compounds Co3InxSn2-x S2

Yanagi, Y., Ikeda, J., Fujiwara, K., Nomura, K., Tsukazaki, A. & Suzuki, M. T., 2021 5月 7, In: Physical Review B. 103, 20, 205112.

研究成果: Article › 査読

Open Access

8 被引用数 (Scopus)

Formation of ilmenite-type single-crystalline MgTiO₃ thin films by pulsed-laser deposition

Negishi, M., Fujiwara, K. & Tsukazaki, A., 2021 12月 1, In: AIP Advances. 11, 12, 125125.

研究成果: Article › 査読

1 被引用数 (Scopus)

Preparation of flexible thin films from epitaxially grown anatase nb: Tio2 using water-soluble sr3al2o6 sacrificial layer

Hiraoka, A., Fujiwara, K. & Nishikawa, H., 2021, In: IEEJ Transactions on Electronics, Information and Systems. 141, 7, p. 767-770 4 p.

研究成果: Article › 査読

Preparation of flexible thin films from epitaxially grown anatase Nb: TiO₂ using water-soluble Sr₃Al₂O₆ sacrificial layer

Hiraoka, A., Fujiwara, K. & Nishikawa, H., 2021 12月, In: Electronics and Communications in Japan. 104, 4, e12331.

研究成果: Article › 査読

Robust perpendicular magnetic anisotropy of Co3Sn2 S2 phase in sulfur deficient sputtered thin films

Shiogai, J., Ikeda, J., Fujiwara, K., Seki, T., Takanashi, K. & Tsukazaki, A., 2021 2月, In: Physical Review Materials. 5, 2, 024403.

研究成果: Article › 査読

4 被引用数 (Scopus)

Three-dimensional sensing of the magnetic-field vector by a compact planar-type Hall device

Shiogai, J., Fujiwara, K., Nojima, T. & Tsukazaki, A., 2021 12月, In: Communications Materials. 2, 1, 102.

研究成果: Article › 査読

Open Access

4 被引用数 (Scopus)

Tuning scalar spin chirality in ultrathin films of the kagome-lattice ferromagnet Fe₃Sn

Fujiwara, K., Kato, Y., Seki, T., Nomura, K., Takanashi, K., Motome, Y. & Tsukazaki, A., 2021 12月, In: Communications Materials. 2, 1, 113.

研究成果: Article › 査読

Open Access

2 被引用数 (Scopus)

Two-dimensionality of metallic surface conduction in Co₃Sn₂S₂ thin films

Ikeda, J., Fujiwara, K., Shiogai, J., Seki, T., Nomura, K., Takanashi, K. & Tsukazaki, A., 2021 12月, In: Communications Physics. 4, 1, 117.

研究成果: Article › 査読

Open Access

3 被引用数 (Scopus)

2020

Anomalous Hall effect at the spontaneously electron-doped polar surface of PdCo O2 ultrathin films

Harada, T., Sugawara, K., Fujiwara, K., Kitamura, M., Ito, S., Nojima, T., Horiba, K., Kumigashira, H., Takahashi, T., Sato, T. & Tsukazaki, A., 2020 3月, In: Physical Review Research. 2, 1, 013282.

研究成果: Article › 査読

Open Access

17 被引用数 (Scopus)

Electrical detection of the antiferromagnetic transition in MnTiO₃ ultrathin films by spin Hall magnetoresistance

Miura, K., Fujiwara, K., Shiogai, J., Nojima, T. & Tsukazaki, A., 2020 3月 14, In: Journal of Applied Physics. 127, 10, 103903.

研究成果: Article › 査読

9 被引用数 (Scopus)

Giant magneto-optical responses in magnetic Weyl semimetal Co₃Sn₂S₂

Okamura, Y., Minami, S., Kato, Y., Fujishiro, Y., Kaneko, Y., Ikeda, J., Muramoto, J., Kaneko, R., Ueda, K., Kocsis, V., Kanazawa, N., Taguchi, Y., Koretsune, T., Fujiwara, K., Tsukazaki, A., Arita, R., Tokura, Y. & Takahashi, Y., 2020 12月 1, In: Nature communications. 11, 1, 4619.

研究成果: Article › 査読

Open Access

51 被引用数 (Scopus)

Insulator-to-Metal Transition of Cr₂O₃Thin Films via Isovalent Ru³⁺Substitution

Fujiwara, K., Kitamura, M., Shiga, D., Niwa, Y., Horiba, K., Nojima, T., Ohta, H., Kumigashira, H. & Tsukazaki, A., 2020 6月 23, In: Chemistry of Materials. 32, 12, p. 5272-5279 8 p.

研究成果: Article › 査読

3 被引用数 (Scopus)

Magnetic-field-induced topological phase transition in Fe-doped (Bi,Sb)2 S e3 heterostructures

Satake, Y., Shiogai, J., Mazur, G. P., Kimura, S., Awaji, S., Fujiwara, K., Nojima, T., Nomura, K., Souma, S., Sato, T., Dietl, T. & Tsukazaki, A., 2020 4月, In: Physical Review Materials. 4, 4, 044202.

研究成果: Article › 査読

8 被引用数 (Scopus)

Signature of band inversion in the perovskite thin-film alloys BaS n1-x P bx O3

Shiogai, J., Chida, T., Hashimoto, K., Fujiwara, K., Sasaki, T. & Tsukazaki, A., 2020 3月 15, In: Physical Review B. 101, 12, 125125.

研究成果: Article › 査読

6 被引用数 (Scopus)

Stabilization of a honeycomb lattice of IrO₆ octahedra by formation of ilmenite-type superlattices in MnTiO₃

Miura, K., Fujiwara, K., Nakayama, K., Ishikawa, R., Shibata, N. & Tsukazaki, A., 2020 12月, In: Communications Materials. 1, 1, 55.

研究成果: Article › 査読

Open Access

4 被引用数 (Scopus)

2019

Doping-induced enhancement of anomalous Hall coefficient in Fe-Sn nanocrystalline films for highly sensitive Hall sensors

Fujiwara, K., Satake, Y., Shiogai, J. & Tsukazaki, A., 2019 11月 1, In: APL Materials. 7, 11, 111103.

研究成果: Article › 査読

Open Access

6 被引用数 (Scopus)

Ferromagnetic Co₃Sn₂S₂ thin films fabricated by co-sputtering

Fujiwara, K., Ikeda, J., Shiogai, J., Seki, T., Takanashi, K. & Tsukazaki, A., 2019, In: Japanese journal of applied physics. 58, 5, 050912.

研究成果: Article › 査読

Open Access

17 被引用数 (Scopus)

Fe-Sn nanocrystalline films for flexible magnetic sensors with high thermal stability

Satake, Y., Fujiwara, K., Shiogai, J., Seki, T. & Tsukazaki, A., 2019 12月 1, In: Scientific reports. 9, 1, 3282.

研究成果: Article › 査読

Open Access

19 被引用数 (Scopus)

Formation of distorted rutile-type NbO ₂ , MoO ₂ , and WO ₂ films by reactive sputtering

Fujiwara, K. & Tsukazaki, A., 2019 2月 28, In: Journal of Applied Physics. 125, 8, 085301.

研究成果: Article › 査読

9 被引用数 (Scopus)

Growth control of corundum-derivative MnSnO₃ thin films by pulsed-laser deposition

Miura, K., Fujiwara, K. & Tsukazaki, A., 2019 3月 1, In: AIP Advances. 9, 3, 035210.

研究成果: Article › 査読

Open Access

4 被引用数 (Scopus)

Improving resistance change with temperature and thermal stability in Fe ₃ O ₄ films for higherature resistors

Fujiwara, K., Tsubota, S. & Tanaka, H., 2019 1月 1, In: Applied Physics Express. 12, 1, 011003.

研究成果: Article › 査読

3 被引用数 (Scopus)

Low-frequency noise measurements on Fe-Sn Hall sensors

Shiogai, J., Jin, Z., Satake, Y., Fujiwara, K. & Tsukazaki, A., 2019 12月 1, In: Applied Physics Express. 12, 12, 123001.

研究成果: Article › 査読

Open Access

6 被引用数 (Scopus)

Oxide field-effect transistor with polymer-based gate insulator

Fujiwara, K., 2019 1月 1, In: IEEJ Transactions on Electronics, Information and Systems. 139, 3, p. 207-210 4 p.

研究成果: Article › 査読

Thin-film stabilization of LiNbO ₃ -type ZnSnO ₃ and MgSnO ₃ by molecular-beam epitaxy

Fujiwara, K., Minato, H., Shiogai, J., Kumamoto, A., Shibata, N. & Tsukazaki, A., 2019 2月 1, In: APL Materials. 7, 2, 022505.

研究成果: Article › 査読

Open Access

14 被引用数 (Scopus)

2018

Effect of the depletion region in topological insulator heterostructures for ambipolar field-effect transistors

Satake, Y., Shiogai, J., Fujiwara, K. & Tsukazaki, A., 2018 9月 20, In: Physical Review B. 98, 12, 125415.

研究成果: Article › 査読

7 被引用数 (Scopus)

Enhancement of superconducting transition temperature in FeSe electric-double-layer transistor with multivalent ionic liquids

Miyakawa, T., Shiogai, J., Shimizu, S., Matsumoto, M., Ito, Y., Harada, T., Fujiwara, K., Nojima, T., Itoh, Y., Aida, T., Iwasa, Y. & Tsukazaki, A., 2018 3月 26, In: Physical Review Materials. 2, 3, 031801.

研究成果: Article › 査読

14 被引用数 (Scopus)

Fermi-level tuning of the Dirac surface state in (Bi_1-xSb_x)₂Se₃ thin films

Satake, Y., Shiogai, J., Takane, D., Yamada, K., Fujiwara, K., Souma, S., Sato, T., Takahashi, T. & Tsukazaki, A., 2018 2月 1, In: Journal of Physics Condensed Matter. 30, 8, 085501.

研究成果: Article › 査読

13 被引用数 (Scopus)

Highly conductive PdCoO₂ ultrathin films for transparent electrodes

Harada, T., Fujiwara, K. & Tsukazaki, A., 2018 4月 1, In: APL Materials. 6, 4, 046107.

研究成果: Article › 査読

Open Access

35 被引用数 (Scopus)

High-mobility field-effect transistor based on crystalline ZnSnO₃ thin films

Minato, H., Fujiwara, K. & Tsukazaki, A., 2018 5月 1, In: AIP Advances. 8, 5, 055327.

研究成果: Article › 査読

Open Access

4 被引用数 (Scopus)

Pulsed-laser deposition of InSe thin films for the detection of thickness-dependent bandgap modification

Zheng, D., Shiogai, J., Fujiwara, K. & Tsukazaki, A., 2018 12月 17, In: Applied Physics Letters. 113, 25, 253501.

研究成果: Article › 査読

9 被引用数 (Scopus)

2017

Enhanced electron mobility at the two-dimensional metallic surface of BaSnO₃ electric-double-layer transistor at low temperatures

Fujiwara, K., Nishihara, K., Shiogai, J. & Tsukazaki, A., 2017 5月 15, In: Applied Physics Letters. 110, 20, 203503.

研究成果: Article › 査読

24 被引用数 (Scopus)

Fabrication of tetragonal FeSe-FeS alloy films with high sulfur contents by alternate deposition

Fujiwara, K., Shiogai, J. & Tsukazaki, A., 2017 10月, In: Japanese journal of applied physics. 56, 10, 100308.

研究成果: Article › 査読

Open Access

8 被引用数 (Scopus)

2016

Electric field-induced transport modulation in VO₂ FETs with high- k oxide/organic parylene-C hybrid gate dielectric

Wei, T., Kanki, T., Fujiwara, K., Chikanari, M. & Tanaka, H., 2016 2月 1, In: Applied Physics Letters. 108, 5, 053503.

研究成果: Article › 査読

13 被引用数 (Scopus)

High field-effect mobility at the (Sr,Ba)SnO₃/BaSnO₃ interface

Fujiwara, K., Nishihara, K., Shiogai, J. & Tsukazaki, A., 2016 8月 1, In: AIP Advances. 6, 8, 085014.

研究成果: Article › 査読

15 被引用数 (Scopus)

Impact of parylene-C thickness on performance of KTaO₃ field-effect transistors with high- k oxide/parylene-C hybrid gate dielectric

Wei, T., Fujiwara, K., Kanki, T. & Tanaka, H., 2016 1月 21, In: Journal of Applied Physics. 119, 3, 034502.

研究成果: Article › 査読

4 被引用数 (Scopus)

2015

3D-architected and integrated metal oxide nanostructures and beyond produced by three-dimensional nanotemplate pulsed laser deposition

Hattori, A. N., Fujiwara, Y., Fujiwara, K. & Tanaka, H., 2015 6月 6, In: e-Journal of Surface Science and Nanotechnology. 13, p. 279-283 5 p.

研究成果: Article › 査読

Open Access

6 被引用数 (Scopus)

Discrimination between gate-induced electrostatic and electrochemical characteristics in insulator-to-metal transition of manganite thin films

Nakamura, T., Hattori, A. N., Nguyen, T. V. A., Fujiwara, K. & Tanaka, H., 2015 7月 1, In: Applied Physics Express. 8, 7, 073201.

研究成果: Article › 査読

5 被引用数 (Scopus)

Identification of Giant Mott Phase Transition of Single Electric Nanodomain in Manganite Nanowall Wire

Hattori, A. N., Fujiwara, Y., Fujiwara, K., Nguyen, T. V. A., Nakamura, T., Ichimiya, M., Ashida, M. & Tanaka, H., 2015 7月 8, In: Nano Letters. 15, 7, p. 4322-4328 7 p.

研究成果: Article › 査読

14 被引用数 (Scopus)

2014

Artificial three dimensional oxide nanostructures for high performance correlated oxide nanoelectronics

Tanaka, H., Takami, H., Kanki, T., Hattori, A. N. & Fujiwara, K., 2014 5月, In: Japanese journal of applied physics. 53, 5 SPEC. ISSUE 1, 05FA10.

研究成果: Article › 査読

5 被引用数 (Scopus)

Dual field effects in electrolyte-gated spinel ferrite: Electrostatic carrier doping and redox reactions

Ichimura, T., Fujiwara, K. & Tanaka, H., 2014 7月 24, In: Scientific reports. 4, 5818.

研究成果: Article › 査読

Open Access

16 被引用数 (Scopus)

Electrical switching to probe complex phases in a frustrated manganite

Asthana, S., Fujiwara, K. & Tanaka, H., 2014 6月, In: Solid State Communications. 187, p. 64-67 4 p.

研究成果: Article › 査読

藤原 宏平

研究成果

検索結果

藤原宏平