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Magnetic vortex nucleation modes in static magnetic fields
- Magnetic vortex nucleation modes in static magnetic fields
- Vaňatka, M.; Urbánek, M.; Jíra, R.; Flajšman, L.; Dhankhar, M.; Im, Mi Young; Michalička, J.; Uhlíř, V.; Šikola, T.
- DGIST Authors
- Im, Mi Young
- Issue Date
- AIP Advances, 7(10)
- Article Type
- Buckling; Electric variables measurement; High resolution transmission electron microscopy; Imaging techniques; Magnetic fields; Magnetism; Nucleation; Quantum optics; Transmission electron microscopy; Anisotropic magnetoresistance effects; Electrical measurement; Electrical transport; Electrical transport measurements; Lorentz transmission electron microscopy; Magnetic transmission X-ray microscopies; Micromagnetic simulations; Static magnetic fields; Vortex flow
- The magnetic vortex nucleation process in nanometer- and micrometer-sized magnetic disks undergoes several phases with distinct spin configurations called the nucleation states. Before formation of the final vortex state, small submicron disks typically proceed through the so-called C-state while the larger micron-sized disks proceed through the more complicated vortex-pair state or the buckling state. This work classifies the nucleation states using micromagnetic simulations and provides evidence for the stability of vortex-pair and buckling states in static magnetic fields using magnetic imaging techniques and electrical transport measurements. Lorentz Transmission Electron Microscopy and Magnetic Transmission X-ray Microscopy are employed to reveal the details of spin configuration in each of the nucleation states. We further show that it is possible to unambiguously identify these states by electrical measurements via the anisotropic magnetoresistance effect. Combination of the electrical transport and magnetic imaging techniques confirms stability of a vortex-antivortex-vortex spin configuration which emerges from the buckling state in static magnetic fields. © 2017 Author(s).
- American Institute of Physics Inc.
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