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Asymmetric magnetic domain-wall motion by the Dzyaloshinskii-Moriya interaction

Authors
Je, Soong-GeunKim, Duck-HoYoo, Sang-CheolMin, Byoung-ChulLee, Kyung-JinChoe, Sug-Bong
Issue Date
2-12월-2013
Publisher
AMER PHYSICAL SOC
Citation
PHYSICAL REVIEW B, v.88, no.21
Indexed
SCIE
SCOPUS
Journal Title
PHYSICAL REVIEW B
Volume
88
Number
21
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/101327
DOI
10.1103/PhysRevB.88.214401
ISSN
1098-0121
Abstract
We demonstrate here that ultrathin ferromagnetic Pt/Co/Pt films with perpendicular magnetic anisotropy exhibit a sizable Dzyaloshinskii-Moriya interaction (DMI) effect. Such a DMI effect modifies the domain-wall (DW) energy density and consequently, results in an asymmetric DW expansion driven by an out-of-plane magnetic field under an in-plane magnetic field bias. From an analysis of the asymmetry, the DMI effect is estimated to be strong enough for the DW to remain in the Neel-type configuration in contrast to the general expectations of these materials. Our findings emphasize the critical role of the DMI effect on the DW dynamics as the underlying physics of the asymmetries that are often observed in spin-transfer-related phenomena.
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