We investigate the current-excited magnetization dynamics in a narrow ferromagnetic Permalloy wire by means of Lorentz microscopy, together with the results of simultaneous transport measurements. A detailed structural evolution of the magnetization is presented as a function of the applied current density. Local structural deformation, bidirectional displacement, and magnetization reversal are found below the Curie temperature with increasing the current density. We discuss probable mechanisms of observed features of the current-excited magnetization dynamics.
@article{arxiv.cond-mat/0606547,
title = {Current-excited magnetization dynamics in narrow ferromagnetic wires},
author = {Yoshihiko Togawa and Takashi Kimura and Ken Harada and Tetsuya Akashi and Tsuyoshi Matsuda and Akira Tonomura and Yoshichika Otani},
journal= {arXiv preprint arXiv:cond-mat/0606547},
year = {2009}
}
Comments
11 pages, 2 figures, 3 videos, accepted in Japanese Journal of Applied Physics (Express Letters)