Maximizing domain-wall speed via magnetic anisotropy adjustment in Pt/Co/Pt films

Duck-Ho Kim; Sang-Cheol Yoo; Dae-Yun Kim; Kyoung-Woong Moon; Soong-Geun Je; Cheong-Gu Cho; Byoung-Chul Min; Sug-Bong Choe
April 2014
Applied Physics Letters;4/7/2014, Vol. 104 Issue 14, p1
Academic Journal
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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