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arXiv · 0904.0044

Current-induced microwave excitation of a domain wall confined in a magnetic wire with bi-axial anisotropy

Katsuyoshi Matsushita·Jun Sato·Hiroshi Imamura
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Abstract

We studied the current-induced magnetization dynamics of a domain wall confined in a magnetic wire with bi-axial anisotropy. We showed that above the threshold current density, breathing-mode excitation, where the thickness of the domain wall oscillates, is induced by spin-transfer torque. We found that the breathing-mode can be applied as a source of microwave oscillation because the resistance of the domain wall is a function of the domain wall thickness. In a current sweep simulation, the frequency of the breathing-mode exhibits hysteresis because of the confinement.

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Katsuyoshi Matsushita, Jun Sato, Hiroshi Imamura. 2009-04-01. Current-induced microwave excitation of a domain wall confined in a magnetic wire with bi-axial anisotropy. https://doi.org/10.1143/jpsj.78.093801

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