Interfacial Dzyaloshinskii-Moriya interaction arising from rare-earth orbital magnetism in insulating magnetic oxides
Interfacial Dzyaloshinskii-Moriya interaction arising from rare-earth orbital magnetism in insulating magnetic oxides
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DOI：
10.1038/s41467-020-14924-7
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发表时间：
2020-02-27
影响因子：
16.6
通讯作者：
Beach, Geoffrey S. D.
中科院分区：
文献类型：
--
作者：
Caretta, Lucas;Rosenberg, Ethan;Beach, Geoffrey S. D.
Dzyaloshinskiii-Moriya相互作用（Dzyaloshinskiii-Moriya interaction，简称Dzyaloshinskiii-Moriya）是产生奇异手性和拓扑磁性态（如自旋螺旋和skyrmions）的原因。由于重金属（如Pt）的反转对称性破缺和自旋轨道耦合，金属铁磁体/重金属界面处出现了自旋-轨道耦合。此外，在中心对称的磁性氧化物界面的Pt，DMI驱动的拓扑自旋纹理和快速电流驱动的动力学已被报道，虽然这种自旋的起源还不清楚。虽然在金属系统中，自旋-轨道耦合来自邻近的重金属，但我们表明，在垂直磁化的铁石榴子石中，稀土轨道磁性引起了固有的自旋-轨道耦合，在镜面对称性破缺界面处产生界面DMI。我们表明，稀土离子取代和应变工程可以显着改变的结晶度。这些结果提供了关键的洞察力的手征磁性的起源在低阻尼磁性氧化物和识别路径工程手性和拓扑状态的中心对称氧化物通过稀土离子取代。绝缘磁性氧化物中的界面Dzyaloshinskiii-Moriya相互作用（iH 2）的起源仍然不清楚。在这里，Caretta等人发现，由于稀土轨道磁性，内在的自旋轨道耦合在磁化铁石榴石Tm 3Fe 5 O 12的镜像破磁界面处产生了Irons。
The Dzyaloshinskii-Moriya interaction (DMI) is responsible for exotic chiral and topological magnetic states such as spin spirals and skyrmions. DMI manifests at metallic ferromagnet/heavy-metal interfaces, owing to inversion symmetry breaking and spin-orbit coupling by a heavy metal such as Pt. Moreover, in centrosymmetric magnetic oxides interfaced by Pt, DMI-driven topological spin textures and fast current-driven dynamics have been reported, though the origin of this DMI is unclear. While in metallic systems, spin-orbit coupling arises from a proximate heavy metal, we show that in perpendicularly-magnetized iron garnets, rare-earth orbital magnetism gives rise to an intrinsic spin-orbit coupling generating interfacial DMI at mirror symmetry-breaking interfaces. We show that rare-earth ion substitution and strain engineering can significantly alter the DMI. These results provide critical insights into the origins of chiral magnetism in low-damping magnetic oxides and identify paths toward engineering chiral and topological states in centrosymmetric oxides through rare-earth ion substitution. The origin of interfacial Dzyaloshinskii-Moriya interaction (iDMI) in insulating magnetic oxides remains unclear. Here, Caretta et al. find that an intrinsic spin-orbit coupling due to rare-earth orbital magnetism generates iDMI at mirror symmetry-breaking interfaces of magnetized iron garnets Tm3Fe5O12.