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arXiv 1503.00816cond-mat.mes-hall
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ppm自旋极化的霍尔探测

Hall detection of a ppm spin polarization

Dazhi Hou, Z. Qiu, R. Iguchi, K. Sato, K. Uchida, G. E. W. Bauer, E. Saitoh

摘要:

霍尔效应已被用作磁场和磁化的灵敏探测器。在自旋电子学中,奇异的现象往往来自于非平衡的自旋极化或磁化,这是非常难以直接测量的。这一挑战是由于微小的总磁矩,这是超导量子干涉设备和振动样品磁强计或光谱方法(如X射线磁性圆二色性)无法达到的。克尔效应仅在直接带隙半导体中足够敏感,其中克尔角可以共振增强。在这里,我们证明,即使是百万分之一的多余自旋可以检测到的霍尔效应在室温下。新的霍尔效应不受自旋霍尔电导率的控制,而是受其能量导数的控制,从而与自旋能斯特效应相关。

英文摘要:

Hall effects have been employed as sensitive detectors of magnetic fields and magnetizations. In spintronics, exotic phenomena often emerge from a non-equilibrium spin polarization or magnetization, that is very difficult to measure directly. The challenge is due to the tiny total moment, which is out of reach of superconducting quantum interference devices and vibrating sample magnetometers or spectroscopic methods such as X-ray magnetic circular dichroism. The Kerr effect is sufficiently sensitive only in direct gap semiconductors, in which the Kerr angle can be resonantly enhanced. Here we demonstrate that even one excess spin in a million can be detected by a Hall effect at room temperature. The novel Hall effect is not governed by the spin Hall conductivity but by its energy derivative thereby related to the spin Nernst effect.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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