Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 527, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jmmm.2021.167758
Keywords
Unidirectional vortex core switching; Convergence/divergence mode; Nanostructured magnetic material
Funding
- National Key R&D Program of China [2017YFB0903700, 2017YFB0903702]
- YiChang Government funding [A19-402-a05]
- Global Research Laboratory Program [2009-00439]
- Max Planck POSTECH/KOREA Research Initiative Program through the National Research Foundation of Korea (NRF) - Ministry of Science, ICT & Future Planning [2016K1A4A4A01922028]
- Korea Research Foundation (NRF) [2018R1A2B3009569]
- Korea Basic Science Institute (KBSI) [D38614]
- National Research Foundation of Korea [2018R1A2B3009569] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The study investigates the reliable unidirectional switching of a magnetic vortex core driven by a continuous rotating magnetic field using a permalloy nanodisk with a nanocavity inserted in the center in combination with micromagnetic simulations. It is found that the nanocavity modulates the modes of core motion differently based on its size, reducing the threshold field amplitude required for vortex core switching for convergence mode. The confinement of the nanocavity to the core is mediated by the cavity height, and low-power-driven fast unidirectional switching is achievable by carefully choosing the value of the nanocavity height.
Reliable unidirectional switching of magnetic vortex core driven by continuous rotating magnetic field is investigated using a permalloy nanodisk with a nanocavity inserted in the center in combination with micromagnetic simulations. It is reported that once the vortex core is confined in a nanocavity of diameter is comparable to the core size, the modes of the core motion (divergence/convergence modes) are modulated differently by the nanocavity: the threshold field amplitude required for vortex core switching is reduced for convergence mode, but not for divergence mode. We found that the confinement of the nanocavity to the core is mediated by the cavity height as well. Low-power-driven fast unidirectional switching is found to be achievable by carefully choosing the value of the nanocavity height.
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