Superconductivity-induced change in magnetic anisotropy in epitaxial ferromagnet-superconductor hybrids with spin-orbit interaction
Superconductivity-induced change in magnetic anisotropy in epitaxial ferromagnet-superconductor hybrids with spin-orbit interaction
复制标题
DOI：
10.1103/physrevb.102.020405
复制
发表时间：
2020-07-15
影响因子：
3.7
通讯作者：
Aliev, Farkhad G.
中科院分区：
文献类型：
--
作者：
Gonzalez-Ruano, Cesar;Johnsen, Lina G.;Aliev, Farkhad G.
在薄膜超导体/铁磁体异质结构中，超导性和铁磁性之间的相互作用通常通过由F层的磁性状态设定的S层的超导性的变化来反映。在这里，我们报告了匡威的效果：一个单一的Fe（001）层的磁晶各向异性的转变，从而其优选的磁化方向，通过一个自旋轨道耦合的MgO界面的超导性的底层V层驱动。我们将此归因于三重态库珀对的受控生成对铁磁体的自由能的额外贡献，这取决于铁磁体的交换场与自旋轨道场之间的相对角度。这是从根本上不同于通常观察到的磁畴修改迈斯纳屏蔽或域壁涡旋相互作用，它提供了从根本上调整磁各向异性使用超导性的能力，在设计未来的低温磁存储器的关键一步。
The interaction between superconductivity and ferromagnetism in thin film superconductor/ferromagnet heterostructures is usually reflected by a change in superconductivity of the S layer set by the magnetic state of the F layers. Here we report the converse effect: transformation of the magnetocrystalline anisotropy of a single Fe(001) layer, and thus its preferred magnetization orientation, driven by the superconductivity of an underlying V layer through a spin-orbit coupled MgO interface. We attribute this to an additional contribution to the free energy of the ferromagnet arising from the controlled generation of triplet Cooper pairs, which depends on the relative angle between the exchange field of the ferromagnet and the spin-orbit field. This is fundamentally different from the commonly observed magnetic domain modification by Meissner screening or domain wall-vortex interaction, and it offers the ability to fundamentally tune magnetic anisotropies using superconductivity-a key step in designing future cryogenic magnetic memories.