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

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,...

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Bibliographic Details
Published in:Applied physics letters 2014-04, Vol.104 (14)
Main Authors: Kim, Duck-Ho, Yoo, Sang-Cheol, Kim, Dae-Yun, Moon, Kyoung-Woong, Je, Soong-Geun, Cho, Cheong-Gu, Min, Byoung-Chul, Choe, Sug-Bong
Format: Article
Language:English
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Summary: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.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4871091