Ratchet effect of virtual domain wall motion in discrete magnetic nanodot chains

Recently, virtual domain walls (VDWs) contained within a narrow gap among discrete magnetic nanoelements without real internal spin structures and thus with a significantly suppressed stochastic nature of domain wall propagation have attracted considerable attention. In this work, the ratchet effect...

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Bibliographic Details
Published inApplied physics express Vol. 10; no. 12; pp. 125001 - 125004
Main Authors Ma, Xiao-Ping, Kim, Seon-Dae, Piao, Hong-Guang, Kim, Dong-Hyun
Format Journal Article
LanguageEnglish
Published The Japan Society of Applied Physics 01.12.2017
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Summary:Recently, virtual domain walls (VDWs) contained within a narrow gap among discrete magnetic nanoelements without real internal spin structures and thus with a significantly suppressed stochastic nature of domain wall propagation have attracted considerable attention. In this work, the ratchet effect of VDW motion in asymmetrically shaped nanodot chains under alternating magnetic fields was numerically investigated via micromagnetic simulations. The results show that the asymmetric stray field distribution in the gap and the magnetic shape anisotropy of the nanodots are the primary causes of the VDW ratchet effect. The ratchet behavior is found to be controllable via modulation of the frequency and strength of the alternating magnetic field, as well as by modifying the geometric shape of the asymmetric nanodots. A unilateral bandpass filter based on the VDW ratchet effect is proposed.
ISSN:1882-0778
1882-0786
DOI:10.7567/APEX.10.125001