Spin transport across antiferromagnets induced by the spin Seebeck effect
Spin transport across antiferromagnets induced by the spin Seebeck effect
复制标题
DOI：
10.1088/1361-6463/aab223
复制
发表时间：
2018-04-11
影响因子：
3.4
通讯作者：
Klaeui, Mathias
中科院分区：
文献类型：
--
作者：
Cramer, Joel;Ritzmann, Ulrike;Klaeui, Mathias
对于基于纯自旋电流传播的未来自旋电子学器件，反铁磁体是一类有趣的材料，与铁磁体相比，它可能具有许多优点。在这里，我们通过原子自旋动力学模拟对铁磁-反铁磁多层膜中的磁子自旋电流输运进行了详细的理论研究。确定了反铁磁体中磁振子自旋输运的相关长度尺度。我们证明了角动量从铁磁体到反铁磁体的转移是由于反铁磁体中只有一个磁振子分支被激发。作为一个实验系统，我们确定了在Y3 Fe 5 O 12竖条Ir 20 Mn 80竖条Pt异质结构的反铁磁体的输运。我们确定的自旋传输信号的自旋Seebeck效应在Y3 Fe 5 O 12中产生的自旋电流，并比较测量的自旋霍尔磁阻在异质结构堆叠。通过温度相关和厚度相关的测量，我们得出了Ir 20 Mn 80的自旋输运机制的结论，并进一步将其与顺磁-反铁磁相变联系起来。
For prospective spintronics devices based on the propagation of pure spin currents, antiferromagnets are an interesting class of materials that potentially entail a number of advantages as compared to ferromagnets. Here, we present a detailed theoretical study of magnonic spin current transport in ferromagnetic-antiferromagnetic multilayers by using atomistic spin dynamics simulations. The relevant length scales of magnonic spin transport in antiferromagnets are determined. We demonstrate the transfer of angular momentum from a ferromagnet into an antiferromagnet due to the excitation of only one magnon branch in the antiferromagnet. As an experimental system, we ascertain the transport across an antiferromagnet in Y3Fe5O12 vertical bar Ir20Mn80 vertical bar Pt heterostructures. We determine the spin transport signals for spin currents generated in the Y3Fe5O12 by the spin Seebeck effect and compare to measurements of the spin Hall magnetoresistance in the heterostructure stack. By means of temperature-dependent and thickness-dependent measurements, we deduce conclusions on the spin transport mechanism across Ir20Mn80 and furthermore correlate it to its paramagnetic-antiferromagnetic phase transition.