Metastable magnetic domain wall dynamics
- Authors
- Jamali, Mahdi; Lee, Kyung-Jin; Yang, Hyunsoo
- Issue Date
- 9-3월-2012
- Publisher
- IOP PUBLISHING LTD
- Citation
- NEW JOURNAL OF PHYSICS, v.14
- Indexed
- SCIE
SCOPUS
- Journal Title
- NEW JOURNAL OF PHYSICS
- Volume
- 14
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/105308
- DOI
- 10.1088/1367-2630/14/3/033010
- ISSN
- 1367-2630
- Abstract
- The dynamics of metastable magnetic domain walls in straight ferromagnetic nanowires under spin waves, external magnetic fields and current-induced spin-transfer torque are studied by means of micromagnetic simulations. It is found that in contrast to a stable wall, it is possible to displace a metastable domain wall in the absence of external excitation. In addition, independent of the domain wall excitation method, the velocity of a metastable wall is much smaller than that of a stable wall and its displacement direction could be different from that of the stable wall depending on the structure of metastable walls. Under current-induced spin-transfer torque excitation, the direction of domain wall displacement is directly related to the intensity of non-adiabatic spin-transfer torque. In a rough nanowire, it is found that the displacement of a metastable wall could happen much below the critical excitation of a stable wall. Furthermore, we show that it is possible to have either a forward or a backward displacement of a metastable domain wall by changing the pulse width of the excitation.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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