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Journal Articles

Enhanced magneto-optical Kerr effect at Fe/insulator interfaces

Gu, B.; Takahashi, Saburo*; Maekawa, Sadamichi

Physical Review B, 96(21), p.214423_1 - 214423_6, 2017/12

 Times Cited Count:4 Percentile:60.86(Materials Science, Multidisciplinary)

Journal Articles

Enhanced orbital magnetic moment in FeCo nanogranules observed by Barnett effect

Ogata, Yudai; Chudo, Hiroyuki; Gu, B.; Kobayashi, Nobukiyo*; Ono, Masao; Harii, Kazuya; Matsuo, Mamoru; Saito, Eiji; Maekawa, Sadamichi

Journal of Magnetism and Magnetic Materials, 442, p.329 - 331, 2017/11

 Times Cited Count:3 Percentile:50.94(Materials Science, Multidisciplinary)

Journal Articles

New p- and n-type ferromagnetic semiconductors; Cr-doped BaZn$$_{2}$$As$$_{2}$$

Gu, B.; Maekawa, Sadamichi

AIP Advances (Internet), 7(5), p.055805_1 - 055805_6, 2017/05

 Times Cited Count:2 Percentile:79.95(Nanoscience & Nanotechnology)

Journal Articles

Magnetization dynamics and its scattering mechanism in thin CoFeB films with interfacial anisotropy

Okada, Atsushi*; He, S.*; Gu, B.; Kanai, Shun*; Soumyanarayanan, A.*; Lim, S. T.*; Tran, M.*; Mori, Michiyasu; Maekawa, Sadamichi; Matsukura, Fumihiro*; et al.

Proceedings of the National Academy of Sciences of the United States of America, 144(15), p.3815 - 3820, 2017/04

Journal Articles

Skew scattering from correlated systems; Impurities and collective excitations in the spin Hall effect

Ziman, T.*; Gu, B.; Maekawa, Sadamichi

Journal of the Physical Society of Japan, 86(1), p.011005_1 - 011005_8, 2017/01

 Times Cited Count:1 Percentile:79.84(Physics, Multidisciplinary)

Journal Articles

Diluted magnetic semiconductors with narrow band gaps

Gu, B.; Maekawa, Sadamichi

Physical Review B, 94(15), p.155202_1 - 155202_8, 2016/10

AA2016-0395.pdf:0.38MB

 Times Cited Count:9 Percentile:41.6(Materials Science, Multidisciplinary)

Journal Articles

What determines the sign of the spin Hall effects in Cu alloys doped with 5d elements?

Xu, Z.; Gu, B.; Mori, Michiyasu; Ziman, T.*; Maekawa, Sadamichi

Journal of Magnetism and Magnetic Materials, 400, p.184 - 187, 2016/02

 Times Cited Count:3 Percentile:74.39(Materials Science, Multidisciplinary)

Journal Articles

Strong suppression of the spin hall effect in the spin glass state

Niimi, Yasuhiro*; Kimata, Motoi*; Omori, Yasutomo*; Gu, B.; Ziman, T.*; Maekawa, Sadamichi; Fert, A.*; Otani, Yoshichika*

Physical Review Letters, 115(19), p.196602_1 - 196602_5, 2015/11

 Times Cited Count:8 Percentile:37.08(Physics, Multidisciplinary)

Journal Articles

Enhanced spin Hall effect by electron correlations in CuBi alloys

Gu, B.; Xu, Z.; Mori, Michiyasu; Ziman, T.*; Maekawa, Sadamichi

Journal of Applied Physics, 117(17), p.17D503_1 - 17D503_4, 2015/05

 Times Cited Count:6 Percentile:62.12(Physics, Applied)

Journal Articles

Analysis of the spin Hall effect in CuIr alloys; Combined approach of density functional theory and Hartree-Fock approximation

Xu, Z.; Gu, B.; Mori, Michiyasu; Ziman, T.*; Maekawa, Sadamichi

Journal of Applied Physics, 117(17), p.17D510_1 - 17D510_4, 2015/05

 Times Cited Count:4 Percentile:73.21(Physics, Applied)

Journal Articles

Charge-to-spin conversion and spin diffusion in Bi/Ag bilayers observed by spin-polarized positron beam

Zhang, H. J.; Yamamoto, Shunya; Gu, B.; Li, H.; Maekawa, Masaki; Fukaya, Yuki; Kawasuso, Atsuo

Physical Review Letters, 114(16), p.166602_1 - 166602_5, 2015/04

 Times Cited Count:28 Percentile:12.39(Physics, Multidisciplinary)

Charge-to-spin conversion induced by the Rashba-Edelstein effect was directly observed for the first time in samples with no magnetic layer. A spin-polarized positron beam was used to probe the spin polarization of the outermost surface electrons of Bi/Ag/Al$$_2$$O$$_3$$ and Ag/Bi/Al$$_2$$O$$_3$$ when charge currents were only associated with the Ag layers. An opposite surface spin polarization was found between Bi/Ag/Al$$_2$$O$$_3$$ and Ag/Bi/Al$$_2$$O$$_3$$ samples with the application of a charge current in the same direction. The surface spin polarizations of both systems decreased exponentially with the outermost layer thickness, suggesting the occurrence of spin diffusion from the Bi/Ag interface to the outermost surfaces. This work provides a new technique to measure spin diffusion length.

Journal Articles

Sign change of the spin Hall effect due to electron correlation in nonmagnetic CuIr alloys

Xu, Z.; Gu, B.; Mori, Michiyasu; Ziman, T.*; Maekawa, Sadamichi

Physical Review Letters, 114(1), p.017202_1 - 017202_5, 2015/01

 Times Cited Count:14 Percentile:24.08(Physics, Multidisciplinary)

Journal Articles

Negatively charged muonium as a detector of electron spin polarization; A Puzzle and a possible theory

Gu, B.; Ziman, T.*; Maekawa, Sadamichi

JPS Conference Proceedings (Internet), 2, p.010301_1 - 010301_5, 2014/03

Journal Articles

Diluted ferromagnetic semiconductor Li(Zn,Mn)P with decoupled charge and spin doping

Deng, Z.*; Zhao, K.*; Gu, B.; Han, W.*; Zhu, J. L.*; Wang, X. C.*; Li, X.*; Liu, Q. Q.*; Yu, R. C.*; Goko, Tatsuo*; et al.

Physical Review B, 88(8), p.081203_1 - 081203_5, 2013/08

 Times Cited Count:58 Percentile:6.84(Materials Science, Multidisciplinary)

Journal Articles

Anisotropic two-dimensional electron gas at the LaAlO$$_{3}$$/SrTiO$$_{3}$$ (110) interface

Annadi, A.*; Zhang, Q.*; Renshaw Wang, X.*; Tuzla, N.*; Gopinadhan, K.*; L$"u$, W. M.*; Roy Barman, A.*; Liu, Z. Q.*; Srivastava, A.*; Saha, S.*; et al.

Nature Communications (Internet), 4, p.1838_1 - 1838_7, 2013/05

 Times Cited Count:80 Percentile:4.26(Multidisciplinary Sciences)

Journal Articles

Theory of the spin Hall effect, and its inverse, in a ferromagnetic metal near the Curie temperature

Gu, B.; Ziman, T.*; Maekawa, Sadamichi

Physical Review B, 86(24), p.241303_1 - 241303_5, 2012/12

 Times Cited Count:9 Percentile:55.31(Materials Science, Multidisciplinary)

Journal Articles

The Spin Hall effect as a probe of nonlinear spin fluctuations

Wei, D. H.*; Niimi, Yasuhiro*; Gu, B.; Ziman, T.*; Maekawa, Sadamichi; Otani, Yoshichika*

Nature Communications (Internet), 3, p.1058_1 - 1058_5, 2012/09

 Times Cited Count:23 Percentile:21.85(Multidisciplinary Sciences)

Journal Articles

Li(Zn,Mn)As as a new generation ferromagnet based on a I-II-V semiconductor

Deng, Z.*; Jin, C. Q.*; Liu, Q. Q.*; Wang, X. C.*; Zhu, J. L.*; Feng, S. M.*; Chen, L. C.*; Yu, R. C.*; Arguello, C.*; Goko, Tatsuo*; et al.

Nature Communications (Internet), 2, p.1425_1 - 1425_5, 2011/08

 Times Cited Count:118 Percentile:6.04(Multidisciplinary Sciences)

In a prototypical ferromagnet (Ga,Mn)As based on a III-V semiconductor, substitution of divalent Mn atoms into trivalent Ga sites leads to severely limited chemical solubility and metastable specimens available only as thin films. The doping of hole carriers via (Ga,Mn) substitution also prohibits electron doping. To overcome these difficulties, Masek et al. theoretically proposed systems based on a I-II-V semiconductor LiZnAs, where isovalent (Zn,Mn) substitution is decoupled from carrier doping with excess/deficient Li concentrations. Here we show successful synthesis of Li$$_{1+y}$$(Zn$$_{1-x}$$Mn$$_x$$)As in bulk materials. We reported that ferromagnetism with a critical temperature of up to 50 K is observed in nominally Li-excess compounds, which have p-type carriers.

Journal Articles

Giant spin Hall effect of Au films with Pt impurities; Surface-assisted skew scattering

Gu, B.; Ziman, T.*; Guo, G.-Y.*; Nagaosa, Naoto; Maekawa, Sadamichi

Journal of Applied Physics, 109(7), p.070502_1 - 070502_3, 2011/03

We show theoretically a novel route to obtain giant room temperature spin Hall effect (SHE) using surface-assisted skew scattering. By a combined approach of density functional theory and the quantum Monte Carlo (QMC) method, we have studied the SHE due to a Pt impurity in different Au hosts. We show that the spin Hall angle (SHA) could become larger than 0.1 on the Au (111) surface, and decreases by about a half on the Au (001) surface, while it is small in bulk Au. The QMC results show that the spin-orbit interaction (SOI) of the Pt impurity on the Au (001) and Au (111) surfaces is enhanced, because the Pt 5$$d$$ levels are lifted to the Fermi level due to the valence fluctuations. In addition, there are two SOI channels on the Au (111) surface, while only one for Pt either on the Au (001) surface or in bulk Au.

Journal Articles

Surface-assisted spin Hall effect in Au films with Pt impurities

Gu, B.; Sugai, Isamu*; Ziman, T.*; Guo, G. Y.*; Nagaosa, Naoto; Seki, Takeshi*; Takanashi, Koki; Maekawa, Sadamichi

Physical Review Letters, 105(21), p.216401_1 - 216401_4, 2010/11

 Times Cited Count:58 Percentile:9.61(Physics, Multidisciplinary)

39 (Records 1-20 displayed on this page)