Dynamic Symmetry Breaking in Chiral Magnetic Systems,Advanced Materials

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Dynamic Symmetry Breaking in Chiral Magnetic Systems
Advanced Materials ( IF 27.4 ) Pub Date : 2021-08-06 , DOI: 10.1002/adma.202101524
Jeffrey A Brock ₁ , Michael D Kitcher ₂ , Pierre Vallobra _{1,

3} , Rajasekhar Medapalli ₁ , Maxwell P Li ₂ , Marc De Graef ₂ , Grant A Riley ₁ , Hans T Nembach ₄ , Stéphane Mangin ₃ , Vincent Sokalski ₂ , Eric E Fullerton ₁

Affiliation

The Dzyaloshinskii–Moriya interaction (DMI) in magnetic systems stabilizes spin textures with preferred chirality, applicable to next-generation memory and computing architectures. In perpendicularly magnetized heavy-metal/ferromagnet films, the interfacial DMI originating from structural inversion asymmetry and strong spin-orbit coupling favors chiral Néel-type domain walls (DWs) whose energetics and mobility remain at issue. Here, a new effect is characterized in which domains expand unidirectionally in response to a combination of out-of-plane and in-plane magnetic fields, with the growth direction controlled by the in-plane field strength. These growth directionalities and symmetries with applied fields cannot be understood from static treatments alone. The authors theoretically demonstrate that perpendicular field torques stabilize steady-state magnetization profiles highly asymmetric in elastic energy, resulting in a dynamic symmetry breaking consistent with the experimental findings. This phenomenon sheds light on the mechanisms governing the dynamics of Néel-type DWs and expands the utility of field-driven DW motion to probe and control chiral DWs.

中文翻译：

手征磁系统中的动态对称破缺

磁性系统中的 Dzyaloshinskii-Moriya 相互作用 (DMI) 以首选手性稳定自旋纹理，适用于下一代内存和计算架构。在垂直磁化的重金属/铁磁体薄膜中，源自结构反转不对称性和强自旋轨道耦合的界面 DMI 有利于手性 Néel 型畴壁（DW），其能量和迁移率仍然存在问题。在这里，一种新效应的特征在于，磁畴响应面外和面内磁场的组合而单向扩展，生长方向由面内场强控制。仅从静态处理无法理解这些生长方向性和与应用场的对称性。作者从理论上证明，垂直场扭矩稳定了弹性能量高度不对称的稳态磁化分布，导致与实验结果一致的动态对称破坏。这种现象揭示了控制 Néel 型 DW 动力学的机制，并扩展了场驱动 DW 运动在探测和控制手性 DW 方面的效用。

更新日期：2021-10-01

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