Maximizing domain-wall speed via magnetic anisotropy adjustment in Pt/Co/Pt films
- Maximizing domain-wall speed via magnetic anisotropy adjustment in Pt/Co/Pt films
- 김덕호; 유상철; 김대윤; 문경웅; 제숭근; 조정구; 민병철; 최석봉
- Issue Date
- Applied physics letters
- VOL 104, NO 14, 142410-1-142410-3
- We report an experimental observation that indicates that a direct relation exists between the
speed of the magnetic domain-wall (DW) motion and the magnitude of the perpendicular
magnetic anisotropy (PMA) in Pt/Co/Pt films. It is found that by changing the thicknesses of the
nonmagnetic Pt layers, the PMA magnitude can be varied significantly and the field-driven DW
speed can also be modified by a factor of up to 50 under the same magnetic field. Interestingly, the DW speed exhibits a clear scaling behavior with respect to the PMA magnitude. A theory
based on the DW creep criticality successfully explains the observed scaling exponent between
the DW speed and the PMA magnitude. The presented results offer a method of maximizing the DW speed in DW-mediated nanodevices without altering the thickness of the magnetic Co layer.
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