Thermal and Coherent Spin Pumping by Noncollinear Antiferromagnets,Physical Review Letters

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Thermal and Coherent Spin Pumping by Noncollinear Antiferromagnets
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-07-18 , DOI: 10.1103/physrevlett.133.036701
Ping Tang ₁ , Gerrit E W Bauer _{1,

2,

3}

Affiliation

Antiferromagnets attract much interest because of their potential for spintronic applications and open fundamental physics questions, but especially noncollinear antiferromagnets remain relatively unexplored. Here, we formulate the thermal and coherent pumping of spins in noncollinear antiferromagnets|normal metal bilayers. We find that the spin current polarization is a vector with components along both the Néel vector and net magnetic moment. The spin mixing conductance for the coherent spin pumping is a tensor with elements depending on the degree of noncollinearity and interface spin configuration. We explain the controversial sign problem of the antiferromagnetic spin Seebeck effect by interface effects and suggest that interface engineering may enhance the spin pumping efficiency.

中文翻译：

非共线反铁磁体的热自旋泵浦和相干自旋泵浦

反铁磁体由于其在自旋电子学应用和开放的基本物理问题方面的潜力而引起了广泛的兴趣，但特别是非共线反铁磁体仍然相对未经探索。在这里，我们制定了非共线反铁磁体|普通金属双层中自旋的热泵浦和相干泵浦。我们发现自旋电流极化是一个矢量，其分量沿着尼尔矢量和净磁矩。相干自旋泵浦的自旋混合电导是一个张量，其元素取决于非共线性程度和界面自旋构型。我们通过界面效应解释了反铁磁自旋塞贝克效应有争议的符号问题，并提出界面工程可以提高自旋泵浦效率。

更新日期：2024-07-19

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