Exchange magnetic field torques in YIG/Pt bilayers observed by the spin-Hall magnetoresistance
Exchange magnetic field torques in YIG/Pt bilayers observed by the spin-Hall magnetoresistance
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DOI：
10.1063/1.4813760
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发表时间：
2013-05
影响因子：
4
通讯作者：
N. Vlietstra;J. Shan;Vincent Castel;J. Youssef;Gerrit E. W. Bauer;Gerrit E. W. Bauer;V. Wees
中科院分区：
文献类型：
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作者：
N. Vlietstra;J. Shan;Vincent Castel;J. Youssef;Gerrit E. W. Bauer;Gerrit E. W. Bauer;V. Wees
用自旋霍尔磁阻(SMR)测量了YIG薄膜在铂(Pt)薄膜中自旋积累的有效场矩。结果，可以电测量铁磁绝缘层的磁化方向。对于不同的铂厚度[3，4，8和35 nm]，实验上的横向和纵向电阻可以用SMR的理论模型用正反自旋-霍尔效应很好地描述。采用自旋霍尔角为0.08，得到了铂的自旋扩散长度(？=1.1±0.3 nm)以及自旋混合电导的实部(Gr=(7±3)×1014？1m？2)和虚部(Gi=(5±3)×1013？1m？2)及其比值(Gr/Gi=16±4)。
The effective field torque of an yttrium-iron-garnet (YIG) film on the spin accumulation in an attached platinum (Pt) film is measured by the spin-Hall magnetoresistance (SMR). As a result, the magnetization direction of a ferromagnetic insulating layer can be measured electrically. Experimental transverse and longitudinal resistances are well described by the theoretical model of SMR in terms of the direct and inverse spin-Hall effect, for different Pt thicknesses [3, 4, 8, and 35 nm]. Adopting a spin-Hall angle of Pt ?SH = 0.08, we obtain the spin diffusion length of Pt (? = 1.1±0.3?nm) as well as the real (Gr = (7±3)×1014???1m?2) and imaginary part (Gi = (5±3)×1013???1m?2) of the spin-mixing conductance and their ratio (Gr/Gi = 16±4).