Nanocavity-Mediated Fast Magnetic Vortex Core In-Situ Switching by Local Magnetic Field
Xiao-Ping Ma1† , Hongguo Yang1† , Changfeng Li1 , Cheng Song2 , and Hong-Guang Piao1*
1 Hubei Engineering Research Center of Weak Magnetic-Field Detection, College of Science, China Three Gorges University, Yichang 443002, China2 Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Abstract ：Fast in situ switching of magnetic vortex core in a ferromagnetic nanodisk assisted by a nanocavity, with diameter comparable to the dimension of a vortex core, is systematically investigated by changing the strength as well as the diameter of the effective circular region of the applied magnetic field. By applying a local magnetic field within a small area at the nanodisk center, fast switching time of about 35 ps is achieved with relatively low field strength (70 mT) which is beneficial for fast data reading and writing. The reason for this phenomenon is that the magnetic spins around the nanocavity is aligned along the cavity wall due to the shape anisotropy when the perpendicular field is applied, which deepens the dip around the vortex core, and thus facilitates the vortex core switching.
收稿日期: 2021-09-21
出版日期: 2021-11-12
:
75.75.-c
(Magnetic properties of nanostructures)
75.75.Jn
(Dynamics of magnetic nanoparticles)
75.78.Cd
(Micromagnetic simulations ?)
85.70.Li
(Other magnetic recording and storage devices (including tapes, disks, And drums))
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2021, Vol. 38 
