期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 50, 期 32, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/aa7a98
关键词
micromagnetism; spintronics; racetrack memory; domain wall; skyrmion; Dzyaloshinskii-Moriya interaction; spin-Hall effect
资金
- Ministero degli Affari Esteri e della Cooperazione Internazionale [CN16GR09]
- project WALL from European Commission [FP7-PEOPLE-2013-ITN 608031]
- Spanish government [MAT2014-52477-C5-4-P]
- Junta de Castilla y Leon [SA282U14]
- King Abdullah University of Science and Technology (KAUST)
A storage scheme based on racetrack memory, where the information can be coded in a domain or a skyrmion, seems to be an alternative to conventional hard disk drive for high density storage. Here, we perform a full micromagnetic study of the performance of synthetic antiferromagnetic (SAF) racetrack memory in terms of velocity and sensitivity to defects by using experimental parameters. We find that, to stabilize a SAF skyrmion, the DzyaloshinskiiMoriya interaction in the top and the bottom ferromagnet should have an opposite sign. The velocity of SAF skyrmions and SAF Neel domain walls are of the same order and can reach values larger than 1200 m s(-1) if a spin-orbit torque from the spin-Hall effect with opposite sign is applied to both ferromagnets. The presence of disordered anisotropy in the form of randomly distributed grains introduces a threshold current for both SAF skyrmions and SAF domain walls motions.
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