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Band-structure-dependent nonlinear giant magnetoresistance in Ni_(1-x)Fe_x dual spin valves

机译:Ni_(1-x)Fe_x双自旋阀中基于能带结构的非线性巨磁电阻

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摘要

Conventional giant magnetoresistance (GMR) in spin valves is current-independent, so the resistance of a device depends only on the relative orientation of the magnetic layers. In dual spin valves consisting of three ferromagnetic (FM) layers separated by nonmagnetic (NM) spacers (i.e., a FM1/NM/FM2/NM/FM1), GMR can be current-dependent if spin can accumulate in FM2 when outer FM1 layers are aligned antiparallel. Currently the underlying physics is poorly understood, although spin accumulation in FM2 is likely to depend on the gradient in the density of states at the Fermi energy of the ferromagnet. To investigate this hypothesis, we have measured a series of dual spin valves with Ni_(1-x)Fe_x as FM2 layers of varying composition. We show that both the magnitude and sign of the nonlinear GMR depend strongly on the Fe content and thus on the band structure of the ferromagnet FM2.
机译:自旋阀中的常规巨型磁阻(GMR)与电流无关,因此设备的电阻仅取决于磁性层的相对方向。在由三层铁磁(FM)层(由非磁性(NM)垫片(即FM1 / NM / FM2 / NM / FM1)分隔)组成的双自旋阀中,如果外层FM1层自旋能在FM2中累积,则GMR可能取决于电流对齐反平行。尽管FM2中的自旋积累可能取决于铁磁体的费米能级下的状态密度梯度,但目前对底层物理学的了解还很少。为了研究这个假设,我们测量了一系列具有Ni_(1-x)Fe_x作为成分不同的FM2层的双自旋阀。我们表明,非线性GMR的大小和符号都强烈依赖于Fe含量,因而也依赖于铁磁体FM2的能带结构。

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