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[资源] nature文章－非磁性材料的巨大自旋塞贝克效应

Giant spin Seebeck effect in a non-magneticmaterial

The spin Seebeck effect is observed when a thermal gradient applied
to a spin-polarized material leads to a spatially varying transverse
spin current in an adjacent non-spin-polarized material, where it
gets converted into a measurable voltage. It has been previously
observed with a magnitude of microvolts per kelvin in magnetically
orderedmaterials, ferromagneticmetals1, semiconductors2 and insulators3.
Here we describe a signal in a non-magnetic semiconductor
(InSb) that has the hallmarks of being produced by the spin Seebeck
effect, but is three orders ofmagnitude larger (millivolts per kelvin).
We refer to the phenomenon that produces it as the giant spin
Seebeck effect. Quantizingmagnetic fields spin-polarize conduction
electrons in semiconductors by means of Zeeman splitting, which
spin–orbit couplingamplifies by a factor of 25 in InSb.Wepropose
that the giant spin Seebeck effect is mediated by phonon–electron
drag, which changes the electrons’momentumand directlymodifies
the spin-splitting energy through spin–orbit interactions. Owing to
the simultaneously strong phonon–electron drag and spin–orbit
coupling in InSb, the magnitude of the giant spin Seebeck voltage
is comparable to the largest known classical thermopower value.

自旋塞贝克效应是目前磁学比较热点的前沿之一，目前国内几个单位比如物理所、武汉理工大学等都陆续开展了一些探索工作，希望大家关注[ 来自科研家族磁性材料 ]

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附件 1 : GiantspinSeebeckeffectinanon-magneticmaterial.pdf

2012-09-24 15:16:06, 1.41 M