Electric spectroscopy of vortex states and dynamics in magnetic disks
Minori Goto, Hiroshi Hata, Akinobu Yamaguchi, Yoshinobu Nakatani,, Takehiro Yamaoka, Yukio Nozaki, Hideki Miyajima
TL;DR
This paper investigates the resonant excitation of magnetic vortex cores in disks using RF currents and fields, measuring voltage spectra to analyze vortex properties and spin torque effects.
Contribution
It introduces a method to directly determine vortex characteristics and spin torque strength from rectifying voltage spectra using analytical calculations.
Findings
Successful measurement of vortex properties and spin torque strength.
Analytical model accurately predicts rectifying voltage spectra.
Enhanced understanding of vortex dynamics in magnetic disks.
Abstract
Spin-polarized radio frequency (RF) currents and RF-Oersted fields resonantly excite a magnetic vortex core confined in a micron-scale soft magnetic disk. In this study, we measured the rectifying voltage spectra caused by the anisotropic magnetoresistance oscillation due to the gyration of the vortex with different polarity and chirality. The measured spectra are presented such that we can determine the vortex properties and strength of the spin torques and Oersted field accurately and directly through analytical calculation.
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