Journal
APPLIED PHYSICS LETTERS
Volume 104, Issue 14, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4871091
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Funding
- National Research Foundation of Korea (NRF)
- Korean Government (MSIP) [2012-003418, 2008-0061906]
- KIST Institutional Program
- Pioneer Research Center Program through NRF [2011-0027905]
- MEST
- International Research and Development Program of the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology (MEST) of Korea [2012-00156]
- Korean Government
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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. (C) 2014 AIP Publishing LLC.
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