Current-excited magnetization dynamics in narrow ferromagnetic wires
Yoshihiko Togawa, Takashi Kimura, Ken Harada, Tetsuya Akashi, Tsuyoshi, Matsuda, Akira Tonomura, Yoshichika Otani
TL;DR
This study explores how current influences magnetization behavior in narrow ferromagnetic wires, revealing structural changes, displacements, and reversals, with implications for magnetic device control.
Contribution
It provides detailed experimental insights into current-induced magnetization dynamics in narrow ferromagnetic wires using Lorentz microscopy and transport measurements.
Findings
Structural deformation occurs below Curie temperature.
Magnetization reversal is observed with increasing current density.
Bidirectional displacement of magnetic structures is detected.
Abstract
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.
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