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Ramos, R.*; 吉川 貴史*; Aguirre, M.*; Lucas, I.*; Anad
n, A.*; 小宅 教文*; 内田 健一*; 安立 裕人; 塩見 淳一郎*; Algarabel, P. A.*; et al.
Physical Review B, 92(22), p.220407_1 - 220407_5, 2015/12
被引用回数：76 パーセンタイル：91.20(Materials Science, Multidisciplinary)Spin Seebeck effects have been investigated in highly crystalline magnetic multilayer films. Voltage as well as power generated by the spin Seebeck effect were found to be significantly enhanced with increasing the number of layers, 
. This voltage enhancement defies the simple understanding of the spin Seebeck effect and suggests that spin current flowing between the magnetic layers in the thickness direction plays an important role in the multilayer SSE systems and the observed voltage enhancement.
内田 健一*; 吉川 貴史*; 関 剛斎*; 小宅 教文*; 塩見 淳一郎*; Qiu, Z.*; 高梨 弘毅*; 齊藤 英治
Physical Review B, 92(9), p.094414_1 - 094414_6, 2015/09
被引用回数：93 パーセンタイル：93.62(Materials Science, Multidisciplinary)The anomalous Nernst effect (ANE) has been investigated in alternately stacked multilayer films comprising paramagnetic and ferromagnetic metals. We found that the ANE is enhanced by increasing the number of the paramagnet/ferromagnet interfaces and keeping the total thickness of the films constant, and that the enhancement appears even in the absence of magnetic proximity effects; similar behavior was observed not only in Pt/Fe multilayers but also in Au/Fe and Cu/Fe multilayers free from proximity ferromagnetism. This universal enhancement of the ANE in metallic multilayers suggests the presence of unconventional interface-induced thermoelectric conversion in the Fe films attached to the paramagnets.
OSeO
廣部 大地*; 塩見 雄毅*; 嶋田 裕樹*; 大江 純一郎*; 齊藤 英治
Journal of Applied Physics, 117(5), p.053904_1 - 053904_6, 2015/02
被引用回数：9 パーセンタイル：36.75(Physics, Applied)We report spin-current generation related to skyrmion dynamics resonantly excited by a microwave in a helimagnetic insulator CuOSeO. A Pt layer was fabricated on CuOSeO and voltage in the Pt layer was measured upon magnetic resonance of CuOSeO to electrically detect injected spin currents via the inverse spin Hall effect (ISHE) in Pt. We found that ISHE-induced electromotive forces appear in the skyrmion phase of CuOSeO as well as in the ferrimagnetic phase, which shows that magnetic skyrmions can contribute to the spin pumping effect.
内田 健一*; 吉川 貴史*; 三浦 飛鳥*; 塩見 淳一郎*; 齊藤 英治
Physical Review X, 4(4), p.041023_1 - 041023_9, 2014/11
被引用回数：95 パーセンタイル：94.47(Physics, Multidisciplinary)We report temperature-dependent measurements of longitudinal spin Seebeck effects (LSSEs) in Pt/Y
Fe
O
(YIG)/Pt systems in a high temperature range from room temperature to above the Curie temperature of YIG. The experimental results show that the magnitude of the LSSE voltage in the Pt/YIG/Pt systems rapidly decreases with increasing the temperature and disappears above the Curie temperature. The critical exponent of the LSSE voltage in the Pt/YIG/Pt systems at the Curie temperature is estimated to be 3, which is much greater than that for the magnetization curve of YIG. This difference highlights the fact that the mechanism of the LSSE cannot be explained in terms of simple static magnetic properties in YIG.
