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APS -APS March Meeting 2017 - Event - Canted coherent spin states in p-Si.

机译:APS -APS 2017年3月会议-事件-p-Si中倾斜的相干自旋态。

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The spin waves or magnons are collective excitations of spins in magnetically ordered materials. Spin waves are considered to be the prime candidates for future energy efficient spintronics and magnonics devices. In the absence of magnetic order, the spin transport is believed to be diffusive and spin waves are not expected to exist in non-magnetic semiconductors. Here we present the first experimental proof of spin injection induced spin waves in non-magnetic p-Si. The thermally driven spin injection, also called spin-Seebeck tunneling, leads to non-equilibrium spin accumulation in p-Si. We propose that collective spin excitations or spin waves ensue in the non-magnetic materials due to non-equilibrium spin accumulation when the specimen dimension (p-Si specimen thickness of 2 $mu$ m) is smaller than the spin-diffusion length. The spin excitations are confirmed from magneto-thermal transport measurement showing hysteretic thermal spin crossover behavior.
机译:自旋波或磁振子是磁性有序材料中自旋的集体激发。自旋波被认为是未来高效节能的自旋电子和磁控器件的主要候选者。在没有磁序的情况下,自旋输运被认为是扩散性的,并且预计在非磁半导体中不存在自旋波。在这里,我们介绍了自旋注入在非磁性p-Si中感应自旋波的第一个实验证明。热驱动的自旋注入(也称为自旋Seebeck隧穿)会导致p-Si中非平衡自旋累积。我们提出,当样品尺寸(p-Si样品厚度为2μm)小于自旋扩散长度时,由于非平衡自旋累积,在非磁性材料中会发生集体自旋激发或自旋波。从磁滞热传输测量证实了自旋激发,磁滞热传输测量显示了滞后热自旋交叉行为。

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