Formation of Complex Spin Textures in Thermally Demagnetized La0.7Sr0.3MnO3 Artificial-Spin-Ice Structures
Formation of Complex Spin Textures in Thermally Demagnetized La0.7Sr0.3MnO3 Artificial-Spin-Ice Structures
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热退磁 La0.7Sr0.3MnO3 人造自旋冰结构中复杂自旋织构的形成
DOI：
10.1103/physrevapplied.17.064057
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发表时间：
2022
影响因子：
4.6
通讯作者：
Takamura, Yayoi
中科院分区：
文献类型：
--
作者：
Sasaki, Dayne Y.;Chopdekar, Rajesh V.;Retterer, Scott T.;Jiang, Daniel Y.;Mason, Jeremy K.;Lee, Michael S.;Takamura, Yayoi
人工自旋冰(ASIS)传统上是这样设计的，即每个纳米磁体都具有单磁区的磁构型，该磁构型被认为最小限度地受到岛间偶极相互作用的扰动。利用X射线光电子显微镜进行磁畴成像，我们研究了热退磁的砖结构ASI阵列，结果表明，通过适当选择纳米岛宽度和岛间距可以稳定复杂的自旋织构(CST)。虽然这种宽度依赖关系可以通过孤立纳米岛中形状各向异性的优势来解释，但我们研究的ASIS显示出对纳米岛宽度和岛间间距的复杂依赖。微磁模拟表明，岛间偶极相互作用在CST的形成中起到了作用，CST由单涡旋态和双涡旋态组成。模拟的能量分析提供了对系统能量学的理解，这种系统能量学产生于岛内效应(即形状各向异性和交换能量)和岛间效应(即最近邻纳米岛之间的偶极相互作用)之间的微妙平衡。
Artificial spin ices (ASIs) have traditionally been designed such that each nanomagnet possesses a single-domain magnetic configuration that is assumed to be minimally perturbed by interisland dipolar interactions. Using x-ray photoemission electron microscopy to perform magnetic domain imaging, we study thermally demagnetized-based brickwork ASI arrays and showed that complex spin textures (CSTs) can be stabilized through an appropriate selection of nanoisland width and interisland spacing. While the width dependence can be explained through the dominance of shape anisotropy in isolated nanoislands, the ASIs we investigate demonstrate a complex dependence on both the nanoisland width and interisland spacing. Micromagnetic simulations reveal that interisland dipolar interactions play a role in the formation of CSTs, which are composed of single- and double-vortex states. Energy analysis of the simulations provides an understanding of the system energetics that arises from a delicate balance betweenintraisland effects (i.e., shape anisotropy and exchange energy) andinterisland effects (i.e., dipolar interactions between nearest-neighbor nanoislands).