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Journal Articles

Longitudinal spin Seebeck effect in various garnet ferrites

Uchida, Kenichi*; Nonaka, Tatsumi*; Kikkawa, Takashi*; Kajiwara, Yosuke*; Saito, Eiji

Physical Review B, 87(10), p.104412_1 - 104412_6, 2013/03

https://doi.org/10.1103/PhysRevB.87.104412
 Times Cited Count：98 Percentile：94.73(Materials Science, Multidisciplinary)

The longitudinal spin Seebeck effect (LSSE) is investigated in various garnet ferritesY$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$ ($$R$$ = Gd, Ca; $$M$$ = Al, Mn, V, In, Zr) by means of the inverse spin Hall effect in Pt films. The magnitude of the LSSE voltage in the Pt/Y$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$ samples is found to be enhanced with increasing concentration of Fe in the garnet ferrites, which can be explained by a change in the spin-mixing conductance at the Pt/Y$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$ interfaces. We also investigate the dependence of the LSSE voltage on macroscopic magnetic parameters of Y$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$. The experimental results show that the LSSE voltage in the Pt/Y$$_{3-x}$$$$R$$$$_{x}$$Fe$$_{5-y}$$$$M$$$$_{y}$$O$$_{12}$$ samples hasa positive correlation with the Curie temperature and the saturation magnetization, but no clear correlation with the gyromagnetic ratio and the Gilbert damping constant of the samples.

Journal Articles

Thermal spin pumping and magnon-phonon-mediated spin-Seebeck effect

Uchida, Kenichi*; Ota, Takeru*; Adachi, Hiroto; Xiao, J.*; Nonaka, Tatsumi*; Kajiwara, Yosuke*; Bauer, G. E. W.*; Maekawa, Sadamichi; Saito, Eiji

Journal of Applied Physics, 111(10), p.103903_1 - 103903_11, 2012/05

https://doi.org/10.1063/1.4716012
 Times Cited Count：124 Percentile：96.15(Physics, Applied)

Journal Articles

Spin pumping and magnetization-precession trajectory in thin film systems

Nonaka, Tatsumi*; Ando, Kazuya*; Yoshino, Tatsuro*; Saito, Eiji

Journal of Physics; Conference Series, 266, p.012101_1 - 012101_5, 2011/01

https://doi.org/10.1088/1742-6596/266/1/012101
 Times Cited Count：0 Percentile：0.01(Materials Science, Multidisciplinary)

The spin pumping, generation of spin currents from magnetization precession, has been investigated in terms of the trajectory of magnetization precession in thin film systems. By using the Landau-Lifshitz-Gilbert equation combined with the model of the spin pumping, we found that the magnitude of the spin current generated by the spin pumping is determined by the elliptical orbit area of magnetization precession, which is maximized when the external magnetic field is applied oblique to the film plane.

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