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Direct imaging of thermally driven domain wall motion in magnetic insulators.
|Title||Direct imaging of thermally driven domain wall motion in magnetic insulators.|
|Publication Type||Journal Article|
|Year of Publication||2013|
|Authors||Jiang W, Upadhyaya P, Fan Y, Zhao J, Wang M, Chang L-T, Lang M, Wong KL, Lewis M, Lin Y-T, Tang J, Cherepov S, Zhou X, Tserkovnyak Y, Schwartz RN, Wang KL|
|Journal||Physical review letters|
|Date Published||2013 Apr 26|
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.
|Alternate Journal||Phys. Rev. Lett.|