铁轴矩下的磁不稳定性
Magnetic instability under ferroaxial moment
AI总结：
本研究理论探究电轴向矩引发的磁各向异性与磁不稳定性，通过微扰和平均场计算揭示其与自旋-轨道耦合共同导致面内自旋偏离晶轴的规律，并在团簇模型中发现伴随磁单极子与磁环形偶极子的自旋涡旋相不稳定性。
摘要：
磁各向异性是决定磁结构的重要因素之一，其中一类磁各向异性与晶体对称性密切相关。我们从理论上研究了由电轴向矩引发的磁各向异性及相关磁不稳定性，该电轴向矩在平行于矩的镜面对称破缺时出现，但不需要空间反演与时间反演对称性同时破缺。通过互补开展微扰计算与平均场计算，我们表明电轴向矩出现时会产生面内磁各向异性，该各向异性会与相对论性自旋-轨道耦合共同作用，使面内自旋矩偏离晶轴。我们在单格点与四格点团簇模型中验证了这一趋势，其中四格点团簇模型会引发朝向自旋涡旋相的不稳定性，该相伴随磁单极子与磁环形偶极子。
英文摘要：
Magnetic anisotropy is one of the important factors in determining magnetic structures. A type of magnetic anisotropy is closely related to the symmetry of crystals. We theoretically investigate magnetic anisotropy and its related magnetic instability arising from an electric axial moment, which appears under the breaking of the mirror symmetry parallel to the moment but does not require the breakings of both spatial inversion and time-reversal symmetries. By performing perturbation and mean-field calculations in a complementary way, we show the appearance of the in-plane magnetic anisotropy when the electric axial moment occurs, which tends to tilt in-plane spin moments from the crystal axes in collaboration with relativistic spin--orbit coupling. We demonstrate such a tendency for single-site and four-site cluster models, the latter of which leads to the instability toward a spin vortex phase accompanying magnetic monopole and magnetic toroidal dipole.
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