Noncollinear Remanent Textures Induced by Surface Spin Flop in Synthetic Antiferromagnets with Perpendicular Anisotropy,Physical Review Applied

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Noncollinear Remanent Textures Induced by Surface Spin Flop in Synthetic Antiferromagnets with Perpendicular Anisotropy
Physical Review Applied ( IF 3.8 ) Pub Date : 2021-07-12 , DOI: 10.1103/physrevapplied.16.014028
Benny Böhm ₁ , Lorenzo Fallarino ₂ , Darius Pohl _{3,

4} , Bernd Rellinghaus _{3,

4} , Olav Hellwig _{1,

2,

5}

Affiliation

The surface spin flop, observed in synthetic antiferromagnets (SAFs) with uniaxial anisotropy and strong antiferromagnetic (AF) interlayer exchange coupling, can be considered as a laterally homogeneous, vertical AF domain wall pushed into the SAF from either the top or the bottom in the presence of a strong external vertical magnetic field. As a result, the AF domain wall can be described as a one-dimensional entity. In this work, we present a concept to stabilize laterally homogeneous vertical AF domain walls by local variation of the perpendicular magnetic anisotropy in

Co / Pt

-based SAFs. Our approach not only allows the stabilization of the vertical AF domain wall in the absence of any external magnetic field, but furthermore enables a deterministic selection among four different remanent states, each one stable within a broad external magnetic field range of almost one tesla. We also demonstrate an extension to our concept by stabilizing two coexisting vertical AF domain walls, thus yielding a system with a total of six different selectable (and reprogrammable) remanent states. The controlled stabilization of noncollinear AF textures in the form of vertical AF domain walls at remanence could be used as an infrastructure for propagating spin waves within the AF domain wall itself, as well as for tuning the dynamic behavior of perpendicular standing spin wave modes existing vertically across the SAF.

中文翻译：

具有垂直各向异性的合成反铁磁体中由表面自旋触发器引起的非共线剩余纹理

在具有单轴各向异性和强反铁磁 (AF) 层间交换耦合的合成反铁磁体 (SAF) 中观察到的表面自旋随波可以被认为是横向均匀的垂直 AF 畴壁从顶部或底部推入 SAF存在强大的外部垂直磁场。因此，AF畴壁可以描述为一维实体。在这项工作中，我们提出了一个概念，通过垂直磁各向异性的局部变化来稳定横向均匀的垂直 AF 畴壁。

公司 / 铂

基于 SAF。我们的方法不仅可以在没有任何外部磁场的情况下稳定垂直 AF 畴壁，而且还可以在四种不同的剩余状态之间进行确定性选择，每种状态都在几乎 1 特斯拉的外部磁场范围内保持稳定。我们还通过稳定两个共存的垂直 AF 畴壁来展示我们的概念的扩展，从而产生一个总共具有六个不同的可选（和可重新编程）剩余状态的系统。以剩磁垂直 AF 畴壁形式的非共线 AF 纹理的受控稳定可用作在 AF 畴壁本身内传播自旋波的基础设施，以及用于调整垂直存在的垂直自旋波模式的动态行为穿过新加坡武装部队。

更新日期：2021-07-12

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