Direct imaging of thermally driven domain wall motion in magnetic insulators

Wanjun Jiang, Pramey Upadhyaya, Yabin Fan, Jing Zhao, Minsheng Wang, Li Te Chang, Murong Lang, Kin L. Wong, Mark Lewis, Yen Ting Lin, Jianshi Tang, Sergiy Cherepov, Xuezhi Zhou, Yaroslav Tserkovnyak, Robert N. Schwartz, Kang L. Wang

研究成果: Article同行評審

105 引文 斯高帕斯(Scopus)

摘要

Thermally induced domain wall motion in a magnetic insulator was observed using spatiotemporally resolved polar magneto-optical Kerr effect microscopy. The following results were found: (i) the domain wall moves towards hot regime; (ii) a threshold temperature gradient (5 K/mm), i.e., a minimal temperature gradient required to induce domain wall motion; (iii) a finite domain wall velocity outside of the region with a temperature gradient, slowly decreasing as a function of distance, which is interpreted to result from the penetration of a magnonic current into the constant temperature region; and (iv) a linear dependence of the average domain wall velocity on temperature gradient, beyond a threshold thermal bias. Our observations can be qualitatively explained using a magnonic spin transfer torque mechanism, which suggests the utility of magnonic spin transfer torque for controlling magnetization dynamics.

原文English
文章編號177202
期刊Physical review letters
110
發行號17
DOIs
出版狀態Published - 2013 四月 22

All Science Journal Classification (ASJC) codes

  • 物理與天文學 (全部)

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