期刊
APPLIED PHYSICS LETTERS
卷 110, 期 18, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4982237
关键词
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资金
- Australian Government
- Government of Western Australia
- iVEC
- Australian Research Council's Discovery Early Career Researcher Award [DE120100155]
- University of Western Australia (Research Development Award)
- University of Western Australia (Early Career Researcher Fellowship Support schemes)
- Pawsey Supercomputing Centre
- Australian Research Council [DE120100155] Funding Source: Australian Research Council
Although often important for domain wall device applications, reproducible fabrication of pinning sites at the nano-scale remains challenging. Here, we demonstrate that the stray magnetic field generated beneath magnetic vortex cores can be used to generate localized pinning sites for magnetic domain walls in an underlying, perpendicularly magnetized nanostrip. Moreover, we show that the pinning strength can be tuned by switching the vortex core polarity: switching the core polarity so that it is aligned with the magnetization of the expanding domain (rather than against it) can reduce the vortex-mediated wall depinning field by between 40% and 90%, depending on the system geometry. Significant reductions in the depinning field are also demonstrated in narrow strips by shifting the core away from the strips' centers. Published by AIP Publishing.
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