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論文

Thermal engineering of non-local resistance in lateral spin valves

葛西 伸哉*; 平山 悠介*; 高橋 有紀子*; 三谷 誠司*; 宝野 和博*; 安立 裕人; 家田 淳一; 前川 禎通

Applied Physics Letters, 104(16), p.162410_1 - 162410_4, 2014/04

 被引用回数:14 パーセンタイル:52.39(Physics, Applied)

We study the non-local spin transport in Permalloy/Cu lateral spin valves (LSVs) fabricated on thermally oxidized Si and MgO substrates. While these LSVs show the same magnitude of spin signals, significant substrate dependence of the baseline resistance was observed. The baseline resistance shows much weaker dependence on the inter-electrode distance than that of the spin transport observed in the Cu wires. A simple analysis of voltage-current characteristics in the baseline resistance indicates the observed result can be explained by a combination of the Peltier and Seebeck effects at the injector and detector junctions, suggesting the usage of high thermal conductivity substrate (or under-layer) is effective to reduce the baseline resistance.

論文

Spin-motive force due to a gyrating magnetic vortex

田辺 賢士*; 千葉 大地*; 大江 純一郎*; 葛西 伸哉*; 河野 日出夫*; Barnes, S. E.*; 前川 禎通; 小林 研介*; 小野 輝男*

Nature Communications (Internet), 3, p.845_1 - 845_5, 2012/05

 被引用回数:41 パーセンタイル:82.9(Multidisciplinary Sciences)

A change of magnetic flux through a circuit induces an electromotive force. By analogy, a recently predicated force that results from the motion of non-uniform spin structures has been termed the spin-motive force. Although recent experiments seem to confirm its presence, a direct signature of the spin-motive force has remained elusive. Here we report the observation of a real-time spin-motive force produced by the gyration of a magnetic vortex core. We report a good agreement between the experimental results, theory, and micromagnetic simulations, which, taken as a whole, provide strong evidence in favour of a spin-motive force.

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