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Non-equilibrium dynamic reversal of in-plane ferromagnetic elliptical disk

Title
Non-equilibrium dynamic reversal of in-plane ferromagnetic elliptical disk
Authors
Kim, June SeoHwang, Hee KyeongYou, Chun Yeol
DGIST Authors
Kim, June SeoYou, Chun Yeol
Issue Date
2018
Citation
Journal of Magnetism and Magnetic Materials, 445, 103-109
Type
Article
Article Type
Article
Keywords
Ferromagnetic MaterialsFerromagnetic Resonance FrequencyFerromagnetismFieldLayerMagnetic FieldsMagnetismMagnetizationMagnetization ReversalMicromagnetic SimulationsNon-Equilibrium DynamicsOut-of-plane Magnetic FieldsPrecessional TorquesShape AnisotropySinusoidal Magnetic FieldsSpinThickness DependenceTorqueUltrafast SwitchingVector
ISSN
0304-8853
Abstract
The ultrafast switching mechanism of an in-plane magnetized elliptical magnetic disk by applying dynamic out-of-plane magnetic field pulses is investigated by performing micromagnetic simulations. For the in-plane magnetized nanostructures, the out-of-plane magnetic field is able to rotate the direction of magnetization when the precession torque overcomes the shape anisotropy of the system. This type magnetization reversal is one of non-equilibrium dynamic within a certain transition time util the precession torque is equivalent to the damping torque. By controlling the rise time or fall times of dynamic out-of-plane field pulses, the transition time can be also successively tuned and then an ultrafast switching of an elliptical magnetic nano-disk is clearly achieved by controlling the precessional torque. As another reversal approach, sinusoidal magnetic fields in gigahertz range are applied to the system. Consequently, the thresholds of switching fields are drastically decreased. We also reveal that the ferromagnetic resonance frequencies at the center and the edge of the elliptical disk are most important for microwave sinusoidal out-of-plane magnetic field induced magnetization reversal. © 2017 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/4541
DOI
10.1016/j.jmmm.2017.08.093
Publisher
Elsevier B.V.
Related Researcher
  • Author You, Chun Yeol Spin Phenomena for Information Nano-devices(SPIN) Lab
  • Research Interests Spintronics; Condensed Matter Physics; Magnetic Materials & Thin Films; Micromagnetic Simulations; Spin Nano-Devices
Files:
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Collection:
DGIST-LBNL Research Center for Emerging Materials1. Journal Articles
Department of Emerging Materials ScienceSpin Phenomena for Information Nano-devices(SPIN) Lab1. Journal Articles


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