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∘ 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.
@article{arxiv.0910.2280,
title = {Dipolar field effect on microwave oscillation in a domain wall spin-valve},
author = {Katsuyoshi Matsushita and Jun Sato and Hiroshi Imamura},
journal= {arXiv preprint arXiv:0910.2280},
year = {2009}
}