Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8153553 | Journal of Magnetism and Magnetic Materials | 2018 | 5 Pages |
Abstract
The dynamic behaviors of vortex domain walls (VDWs) in ferromagnetic nanowires driven by a magnetic field above Walker breakdown field (Hw) were investigated using micromagnetic simulation. It was found when nanowire has proper geometrical dimensions, the VDW may oscillate in a chirality invariant mode or a chirality switching mode depending on applied field and damping constant. At fixed damping constant, the oscillation mode can be controlled by applied field - with the increase of applied field, the oscillation of VDW change from a chirality invariant mode to a variant one. As the oscillation of VDW changes from chirality invariant regime to chirality switching regime, the oscillation frequency and amplification will undergo an abnormal change, which may offer a fingerprint for the switch of oscillation mode. Our finding proposes a simple way to control the chirality of a VDW by properly manipulating nanowire geometry and applied field, which may have important applications in VDW-based devices.
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Condensed Matter Physics
Authors
Y. Li, Z. Lu, C. Chen, M. Cheng, H. Yin, W. Wang, C. Li, Y. Liu, R. Xiong, J. Shi,