Spin current pumped by confined breathing skyrmion

Spin pumping is a widely recognized method to generate the spin current in the spintronics, which can be found in varieties of magnetic materials and is acknowledged as a fundamentally dynamic process equivalent to the spin-transfer torque. In this work, we theoretically verified the oscillating spi...

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Bibliographic Details
Published in:New journal of physics 2020-05, Vol.22 (5), p.53029
Main Authors: Zhang, Chunlei, Wang, Jianing, Jin, Chendong, Zeng, Zhaozhuo, Xia, Haiyan, Wang, Jianbo, Liu, Qingfang
Format: Article
Language:English
Subjects:
Alternating current
Ferromagnetic resonance
Ferromagnetism
Hypothetical particles
Magnetic materials
micromagnetics
Particle theory
Physics
Pumping
racetrack memory
skyrmion
Spin dynamics
spin pumping
Spintronics
Torque
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Summary:Spin pumping is a widely recognized method to generate the spin current in the spintronics, which can be found in varieties of magnetic materials and is acknowledged as a fundamentally dynamic process equivalent to the spin-transfer torque. In this work, we theoretically verified the oscillating spin current mixed by AC and DC components can be pumped from the microwave-motivated breathing skyrmion. The spin current can be pumped within a relatively low-frequency microwave compared with the in-plane ferromagnetic resonance (FMR). Although the amplitude of spin current density for a single confined skyrmion is several times lower than the FMR spin pumping, the pumped current would be improved to be the same order as the FMR through a tight skyrmion lattice. Based on the spin pumping of breathing skyrmion, we designed a high reading-speed racetrack memory model whose reading speed is much higher than the SOT (spin-orbit torque)/STT (spin-transfer torque) skyrmion racetrack. Our work focuses on the spin pumping phenomenon inside the breathing skyrmion, and it may contribute to the applications of the skyrmion-based device.
ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/ab83d6