Tang Ping, Bauer Gerrit E W
WPI-AIMR, <a href="https://ror.org/01dq60k83">Tohoku University</a>, 2-1-1 Katahira, Sendai 980-8577, Japan.
Institute for Materials Research and CSIS, <a href="https://ror.org/01dq60k83">Tohoku University</a>, 2-1-1 Katahira, Sendai 980-8577, Japan.
Phys Rev Lett. 2024 Jul 19;133(3):036701. doi: 10.1103/PhysRevLett.133.036701.
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.
反铁磁体因其在自旋电子学应用中的潜力以及尚未解决的基础物理问题而备受关注，但特别是非共线反铁磁体仍相对未被充分探索。在此，我们阐述了非共线反铁磁体|正常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，其分量沿着奈尔矢量和净磁矩方向。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中存在争议的符号问题，并表明界面工程可能会提高自旋泵浦效率。
