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研究成果Publications
2020-
paper 2025
- 72). Observation of two-level critical-state in the van-der-Waals superconductor Pt(Bi1-xSex)2
Y. Samukawa, M. Maeda, N. Jiang*, R. Nakamura, M. Watanabe, K. Takaki, Y. Moriyasu, T. Ikushima, T. Kida, M. Hagiwara, T. Nakamura, Y. Okada, K. Kudo, and Y. Niimi,
Physical Review B 111, 064506 (2025).
paper 2024
- 71). Unconventional anomalous Hall effect in a triangular lattice antiferromagnet
M. Watanabe*, T. Higashihara, R. Asama, M. Tokuda, S. Suzuki, N. Jiang, M. Ochi, H. Ishizuka, H. K. Yoshida, and Y. Niimi*,
Physical Review B 110, 024431 (2024).
- 70). Magnetotransport properties in van der Waals RTe3 (R = La, Ce, Tb)
T. Higashihara, R. Asama, R. Nakamura, M. Watanabe, N. Tomoda, T. J. Hasiweder, Y. Fujisawa, Y. Okada, T. Iwasaki, K. Watanabe, T. Taniguchi, N. Jiang*, and Y. Niimi,
Physical Review B 109, 134404 (2024). Selected as Editors’ suggestion.
paper 2023
- 69). Fabrication of Se-doped PtBi2 Thin Film Devices
M. Maeda, M. Tokuda, R. Nakamura, M. Watanabe, K. Takaki, N. Jiang, K. Kudo, and Y. Niimi*,
JPS Conference Proceedings 38, 011036 (2023).
- 68). Enhancement of spin–flop-induced magnetic hysteresis in van der Waals magnet (Fe1-xCox)5GeTe2
T. Ohta*, K. Kurokawa, N. Jiang, K. Yamagami, Y. Okada, and Y. Niimi*,
Applied Physics Letters 122, 152402 (2023). Selected as Featured article.
paper 2022
- 67). Microwave Dynamical Conductivity in the Quantum Hall Regime
T. Arakawa*, T. Oka, S. Kon, and Y. Niimi,
Physical Review Letters 129, 046801 (2022).
- 66). Higher harmonic resistance oscillations in micro-bridge superconducting Nb ring
M. Tokuda*, R. Nakamura, M. Maeda, and Y. Niimi*,
Japanese Journal of Applied Physics 61, 060908 (2022).
paper 2021
- 65). Thickness-induced crossover from strong to weak collective pinning in exfoliated FeTe0.6Se0.4 thin films at 1 T
R. Nakamura, M. Tokuda, M. Watanabe, M. Nakajima, K. Kobayashi, and Y. Niimi*,
Physical Review B 104, 165412 (2021).
- 64). Negative correlation between the linear and the nonlinear conductance in magnetic tunnel junctions
S. Iwakiri*, S. Sugimoto, Y. Niimi, Y. Kozuka, Y. K. Takahashi, S. Kasai, and K. Kobayashi,
Physical Review B 103, 245427 (2021).
- 63). Charge density wave transitions in mechanically-exfoliated NbSe3 devices
K. Fujiwara, S. Iwakiri, M. Watanabe, R. Nakamura, M. Yokoi, K. Kobayashi, and Y. Niimi*,
Japanese Journal of Applied Physics 60, 070904 (2021).
- 62). Itinerant ferromagnetism mediated by giant spin polarization of the metallic ligand band in the van der Waals magnet Fe5GeTe2
K. Yamagami, Y. Fujisawa, B. Driesen, C. H. Hsu, K. Kawaguchi, H. Tanaka, T. Kondo, Y. Zhang, H. Wadati, K. Araki, T. Takeda, Y. Takeda, T. Muro, F. C. Chuang, Y. Niimi, K. Kuroda, M. Kobayashi, and Y. Okada,
Physical Review B 103, L060403 (2021).
- 61). Butterfly-shaped magnetoresistance in van der Waals ferromagnet Fe5GeTe2
T. Ohta*, M. Tokuda, S. Iwakiri, K. Sakai, B. Driesen, Y. Okada, K. Kobayashi, and Y. Niimi*,
AIP Advances 11, 025014 (2021). Selected as Featured article.
- 60). Shubnikov-de-Haas oscillation and possible modification of effective mass in CeTe3 thin films
M. Watanabe*, R. Nakamura, S.-H. Lee, T. Asano, T. Ibe, M. Tokuda, H. Taniguchi, D. Ueta, Y. Okada, K. Kobayashi, and Y. Niimi*,
AIP Advances 11, 015005 (2021).
paper 2020
- 59). Spin treacle in a frustrated magnet observed with spin current
H. Taniguchi, M. Watanabe, T. Ibe, M. Tokuda, T. Arakawa, T. Taniguchi, B. Gu, T. Ziman, S. Maekawa, K. Kobayashi, and Y. Niimi*,
Physical Review B 102, 094405 (2020).
- 58). Negative resistance state in superconducting NbSe2 induced by surface acoustic waves
M. Yokoi, S. Fujiwara, T. Kawamura, T. Arakawa, K. Aoyama, H. Fukuyama, K. Kobayashi, and Y. Niimi*,
Science Advances 6, eaba1377 (2020).
- 57). Quantum oscillations with magnetic hysteresis observed in CeTe3 thin films
M. Watanabe, S.-H. Lee, T. Asano, T. Ibe, M. Tokuda, H. Taniguchi, D. Ueta, Y. Okada, K. Kobayashi, and Y. Niimi*,
Applied Physics Letters 117, 072403 (2020).
- 56). Etching process of narrow wire and application to tunable-barrier electron pump
S. Norimoto*, S. Iwakiri, M. Yokoi, T. Arakawa, Y. Niimi, and K. Kobayashi,
Review of Scientific Instruments 91, 085110 (2020).
- 55). Tunneling mechanism in a (Ga,Mn)As/GaAs-based spin Esaki diode investigated by bias-dependent shot noise measurements
T. Arakawa*, J. Shiogai, M. Maeda, M. Ciorga, M. Utz, D. Schuh, Y. Niimi, M. Kohda, J. Nitta, D. Bougeard, D. Weiss, and K. Kobayashi,
Physical Review B 102, 045308 (2020).
- 54). Multiple modes of a single spin torque oscillator under the non-linear region
S. Sugimoto*, S. Iwakiri, Y. Kozuka, Y. K. Takahashi, Y. Niimi, K. Kobayashi, and S. Kasai,
AIP Advances 10, 075115 (2020).
- 53). Generation of multipeak spectrum of spin torque oscillator in non-linear regime
S. Iwakiri*, S. Sugimoto, Y. Niimi, K. Kobayashi, Y. Kozuka, Y. K. Takahashi, and S. Kasai,
Applied Physics Letters 117, 022406 (2020).
- 52). Enhancement of coercive field in atomically-thin quenched Fe5GeTe2
T. Ohta, K. Sakai, H. Taniguchi, B. Driesen, Y. Okada, K. Kobayashi, and Y. Niimi*,
Applied Physics Express 13, 043005 (2020).
- 51). Butterfly-shaped magnetoresistance in triangular-lattice antiferromagnet Ag2CrO2
H. Taniguchi, M. Watanabe, M. Tokuda, S. Suzuki, E. Imada, T. Ibe, T. Arakawa, H. Yoshida, H. Ishizuka, K. Kobayashi, and Y. Niimi*,
Scientific Reports 10, 2525 (2020).
