Dynamics and morphology of chiral magnetic bubbles in perpendicularly magnetized ultra-thin films

被引：3

作者：

Sarma, Bhaskarjyoti ^{[1
,2
]}

Garcia-Sanchez, Felipe ^{[3
]}

Nasseri, S. Ali ^{[1
,2
]}

Casiraghi, Arianna ^{[3
]}

Durin, Gianfranco ^{[1
,3
]}

机构：

[1] ISI Fdn, Via Chisola 5, I-10126 Turin, Italy

[2] Politecn Torino, Dept Appl Sci & Technol, Corso Duca Abruzzi 24, I-10129 Turin, Italy

[3] Ist Nazl Ric Metrol, Str Cacce 91, I-10135 Turin, Italy

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2018年 / 456卷

关键词：

Chiral magnetic bubble; Domain wall; Perpendicularly magnetized ultra-thin films; Dzyaloshinskii-Moriya interaction; Vertical Bloch lines;

D O I：

10.1016/j.jmmm.2018.01.075

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We study bubble domain wall dynamics using micromagnetic simulations in perpendicularly magnetized ultra-thin films with disorder and Dzyaloshinskii-Moriya interaction. Disorder is incorporated into the material as grains with randomly distributed sizes and varying exchange constant at the edges. As expected, magnetic bubbles expand asymmetrically along the axis of the in-plane field under the simultaneous application of out-of-plane and in-plane fields. Remarkably, the shape of the bubble has a ripple-like part which causes a kink-like (steep decrease) feature in the velocity versus in-plane field curve. We show that these ripples originate due to the nucleation and interaction of vertical Bloch lines. Furthermore, we show that the Dzyaloshinskii-Moriya interaction field is not constant but rather depends on the in-plane field. We also extend the collective coordinate model for domain wall motion to a magnetic bubble and compare it with the results of micromagnetic simulations. (C) 2018 Elsevier B.V. All rights reserved.

引用

页码：433 / 438

页数：6

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