研究成果｜大阪大学：ナノスケール物性研究室

研究成果Publications

50). Observation of the magnetization metastable state in a perpendicularly magnetized nanopillar with asymmetric potential landscape
S. Iwakiri, S. Sugimoto, Y. Niimi, K. Kobayashi, Y. K. Takahashi, and S. Kasai*,
Applied Physics Letters 115, 092407 (2019).
49). Cavity resonator for circularly polarized microwave irradiation mounted on a cryostat
T. Arakawa*, S. Norimoto, S. Iwakiri, T. Asano, and Y. Niimi,
Review of Scientific Instruments 90, 084707 (2019).
48). Spin transport measurements in metallic Bi/Ni nanowires
M. Tokuda, N. Kabeya, K. Iwashita, H. Taniguchi, T. Arakawa, D. Yue, X.-X. Gong, X.-F. Jin, K. Kobayashi, and Y. Niimi*,
Applied Physics Express 12, 053005 (2019).
47). Relation between spin Hall effect and anomalous Hall effect in 3d ferromagnetic metals
Y. Omori, E. Sagasta, Y. Niimi*, M. Gradhand, L. E. Hueso, F. Casanova, and Y. Otani*,
Physical Review B 99, 014403 (2019).

46). Electrical contacts to thin layers of Bi₂Sr₂CaCu₂O_8+δ
S. Suzuki, H. Taniguchi, T. Kawakami, M. Cosset-Cheneau, T. Arakawa, S. Miyasaka, S. Tajima, Y. Niimi*, and K. Kobayashi,
Applied Physics Express 11, 053201 (2018).
45). Fabrication of thin films of two-dimensional triangular antiferromagnet Ag₂CrO₂ and their transport properties
H. Taniguchi, S. Suzuki, T. Arakawa, H. Yoshida, Y. Niimi*, and K. Kobayashi,
AIP Advances 8, 025010 (2018).

44). Large room temperature spin-to-charge conversion signals in a few-layer graphene/Pt lateral heterostructure
W.-J. Yan, E. Sagasta, M. Ribeiro, Y. Niimi, L. E. Hueso*, and F. Casanova*,
Nature Communications 8, 661 (2017).
43). Dynamics of pure spin current in high-frequency quantum regime
S. Iwakiri, Y. Niimi, and K. Kobayashi,
Applied Physics Express 10, 053001 (2017).
42). Effect of Magnetic Fluctuations on Spin Current
Y. Niimi*, D. H. Wei, and Y. Otani,
Journal of the Physical Society of Japan 86, 011004 (2017).

41). Tuning the spin Hall effect of Pt from the moderately dirty to the superclean regime
E. Sagasta, Y. Omori, M. Isasa, M. Gradhand, L. E. Hueso, Y. Niimi, and Y. Otani, and F. Casanova*,
Physical Review B 94, 060412(R) (2016). Selected as Editors’ suggestion.
40). Spin mixing conductance in Cu-Ir dilute alloys
S. Takizawa*, M. Kimata, Y. Omori, Y. Niimi, and Y. Otani*,
Applied Physics Express 9, 063009 (2016).
39). Influence of inverse spin Hall effect in spin-torque ferromagnetic resonance measurements
K. Kondou*, H. Sukegawa, S. Kasai, S. Mitani, Y. Niimi, and Y. Otani,
Applied Physics Express 9, 023002 (2016).

38). Strong Suppression of the Spin Hall Effect in the Spin Glass State
Y. Niimi*, M. Kimata, Y. Omori, B. Gu, T. Ziman, S. Maekawa, A. Fert, and Y. Otani,
Physical Review Letters 115, 196602 (2015). See also Supplemental Material.
37). Reciprocal spin Hall effects in conductors with strong spin-orbit coupling: a review
Y. Niimi* and Y. Otani*,
Report on Progress in Physics 78, 124501 (2015).
36). Spin relaxation mechanism in a highly doped organic polymer film
M. Kimata*, D. Nozaki, Y. Niimi, H. Tajima, and Y. Otani,
Physical Review B 91, 224422 (2015).
35). Quasiparticle-mediated spin Hall effect in a superconductor
T. Wakamura, H. Akaike, Y. Omori, Y. Niimi, S. Takahashi, A. Fujimaki, S. Maekawa, and Y. Otani*,
Nature Materials 14, 675 (2015).
34). Selective mode excitation in three-chained magnetic vortices
N. Hasegawa, S. Sugimoto, H. Fujimori, K. Kondou, Y. Niimi, and Y. Otani,
Applied Physics Express 8, 063005 (2015).

33). Inverse spin Hall effect in a closed loop circuit
Y. Omori, F. Auvray, T. Wakamura, Y. Niimi*, A. Fert, and Y. Otani,
Applied Physics Letters 104, 242415 (2014).
32). Thickness dependence of spin torque ferromagnetic resonance in Co₇₅Fe₂₅/Pt bilayer films
A. Ganguly, K. Kondou*, H. Sukegawa, S. Mitani, S. Kasai, Y. Niimi, Y. Otani, and A. Barman*,
Applied Physics Letters 104, 072405 (2014).
31). Extrinsic spin Hall effects measured with lateral spin valve structures
Y. Niimi*, H. Suzuki, Y. Kawanishi, Y. Omori, T. Valet, A. Fert, and Y. Otani,
Physical Review B 89, 054401 (2014).
30). Spin Injection into Superconductor with Strong Spin-Orbit Coupling
T. Wakamura, N. Hasegawa, K. Ohnishi, Y. Niimi, and Y. Otani*,
Physical Review Letters 112, 036602 (2014). Selected as Editors’ suggestion.
29). Detection of a symmetric circular gyration of the vortex core via the second-order harmonic magnetoresistance oscillation
S. Sugimoto*, N. Hasegawa, Y. Niimi, Y. Fukuma, S. Kasai, and Y. Otani,
Applied Physics Express 7, 023006 (2014). See also erratum.

28). 5d iridium oxide as a material for spin-current detection
K. Fujiwara*, Y. Fukuma, J. Matsuno, H. Idzuchi, Y. Niimi, Y. Otani, and H. Takagi,
Nature Communications 4, 2893 (2013).
27). Experimental Verification of Comparability between Spin-Orbit and Spin-Diffusion Lengths
Y. Niimi*, D. H. Wei, H. Idzuchi, T. Wakamura, T. Kato, and Y. Otani,
Physical Review Letters 110, 016805 (2013).

26). Giant Spin Hall Effect Induced by Skew Scattering from Bismuth Impurities inside Thin Film CuBi Alloys
Y. Niimi*, Y. Kawanishi, D. H. Wei, C. Deranlot, H. X. Yang, M. Chshiev, T. Valet, A. Fert, and Y. Otani,
Physical Review Letters 109, 156602 (2012). See also Supplemental Material.
25). The spin Hall effect as a probe of nonlinear spin fluctuations
D. H. Wei, Y. Niimi*, B. Gu, T. Ziman, S. Maekawa, and Y. Otani,
Nature Communications 3, 1058 (2012).
24). Perfect alloys for spin Hall current-induced magnetization switching
M. Gradhand*, D. V. Fedorov, P. Zahn, I. Mertig, Y. Otani, Y. Niimi, L. Vila, and A. Fert,
Spin 2, 1250010 (2012).
23). Generation of Large Spin Accumulation in S/N/S Josephson Junctions
T. Wakamura*, K. Ohnishi, Y. Niimi, and Y. Otani,
Journal of Physics: Conference Series 400, 022130 (2012).

22). Large Spin Accumulation with Long Spin Diffusion Length in Cu/MgO/Permalloy Lateral Spin Valves
T. Wakamura, K. Ohnishi, Y. Niimi*, and Y. Otani,
Applied Physics Express 4, 063002 (2011).
21). Indication of intrinsic spin Hall effect in 4d and 5d transition metals
M. Morota, Y. Niimi*, K. Ohnishi, D. H. Wei, T. Tanaka, H. Kontani, T. Kimura, and Y. Otani*,
Physical Review B 83, 174405 (2011).
20). Extrinsic Spin Hall Effect Induced by Iridium Impurities in Copper
Y. Niimi*, M. Morota, D. H. Wei, C. Deranlot, M. Basletic, A. Hamzic, A. Fert, and Y. Otani,
Physical Review Letters 106, 126601 (2011). See also Supplemental Material.

19). Quantum coherence at low temperatures in mesoscopic systems: Effect of disorder
Y. Niimi, Y. Baines, T. Capron, D. Mailly, F.-Y. Lo, A. D. Wieck, T. Meunier, L. Saminadayar*, and C. Bäuerle*,
Physical Review B 81, 245306 (2010). Selected as Editors’ suggestion.