Dipolar field effect on microwave oscillation in a domain wall spin-valve

Physics – Condensed Matter – Mesoscale and Nanoscale Physics

Scientific paper

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4 pages, 4 figures

Scientific paper

10.1109/TMAG.2009.2022337

We examined dipolar field effects on the microwave generation in the domain wall spin-valve by solving simultaneously the Landau-Lifshitz-Gilbert and Zhang-Levy-Fert diffusion equations. By numerically analyzing dipolar field dependence, we showed that the microwave generation needs the dipole-dipole interaction for a 180$^\circ$ domain wall and the amplitude of the microwave voltage signal depends strongly on the exchange length. In order to design a microwave generator using the domain wall spin-valve with high efficiency, we propose that the materials with short exchange length are preferred.

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