Abstract
We demonstrate the current-driven resonance of a single antivortex core confined in a cross-shaped Ni81Fe19 wire. The antivortex core dynamics can be excited purely by spin transfer torque; therefore, it is significant to understand the current-induced magnetization dynamics. The antivortex core resonance can be measured from the frequency dependence of a rectified voltage generated by an alternating current application. We found that the resonance frequency and peak amplitude greatly depend on the external magnetic field. This result is in good agreement with micromagnetic simulation.
Highlights
We demonstrate the current-driven resonance of a single antivortex core confined in a cross-shaped Ni81Fe19 wire
We found that the resonance frequency and peak amplitude greatly depend on the external magnetic field
As reported by Kamionka et al.,[12] the antivortex core dynamics can be dominantly excited by spin transfer torque
Summary
We demonstrate the current-driven resonance of a single antivortex core confined in a cross-shaped Ni81Fe19 wire. Current-driven antivortex core resonance measured by the rectifying effect Minori Goto1,a and Yukio Nozaki2,b 1Graduate School of Engineering Science, Osaka University, J205, 1-3, Machikaneyamacho, Toyonaka, Osaka, 560-8531, Japan 2Department of Physics, Keio University, 22-102, 3-14-1, Hiyoshi, Kohokuku, Yokohama, Kanagawa, 223-8522, Japan (Received 21 November 2015; accepted 20 January 2016; published online 9 February 2016)
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