期刊
IEEE TRANSACTIONS ON MAGNETICS
卷 49, 期 7, 页码 3207-3210出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TMAG.2013.2241403
关键词
Creep scaling constants; current-induced domain wall motion (CIDWM); Joule-heating effects; spin-transfer torque (STT) effects
资金
- National Research Foundation of Korea (NRF)
- Korea government (MEST) [2012-003418, 2008-0062257]
- KIST institutional program
- pioneer research center program through NRF [2011-0027905]
- MEST
We propose here a method for compensating the Joule-heating effects in the current-induced domain wall motion (CIDWM). In CIDWM experiments, the current induces not only the spin-transfer torque (STT) effects but also the Joule-heating effects, and both effects influence the domain wall (DW) motion. It is thus desired to develop a way to compensate the Joule-heating effects, in order to determine the pure STT effects on the DW motion. Up to now, in studies of DW creeping motions, such Joule-heating effects have been eliminated based on the Arrhenius law by assuming the temperature-independent creep scaling constants. However, here we find that such scaling constants are sensitive to the temperature, from the DW creeping experiment in Pt/Co/Pt wires with temperature control in a cryostat. By accounting the temperature dependence of the scaling constants, we demonstrate that all the DW speeds with various temperatures are exactly collapsed onto a single universal curve, which enables us to examine the pure STT effects on the DW motion.
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