Abstract
The time evolution of vortex spin structures in ferromagnetic FeNi disks (4 μm and 6 μm in diameter and thickness of 30 nm) during fast magnetic field pulses was observed by time-resolved x-ray magnetic circular dichroism with photoelectron emission microscopy. For the smaller disk, the displacement of the vortex core was found to linearly follow the field amplitude as described by an analytical model based on Thiele's equation with boundary conditions for patterned magnets. In contrast, for the larger disk which contains a smaller magnetic restoring force, a nonlinear response of the core displacement to the field amplitude, and also a sub-ns delay of the core motion, was observed. In parallel a deformation of the vortex spin structure was observed. Part of the Zeeman energy is stored in deforming the vortex structure during the rise time of the magnetic field with a large ΔH/Δt.
| Original language | English |
|---|---|
| Article number | 134414 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 85 |
| Issue number | 13 |
| DOIs | |
| Publication status | Published - Apr 6 2012 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
Cite this
Nonlinear motion of magnetic vortex cores during fast magnetic pulses. / Fukumoto, Keiki; Arai, Kuniaki; Kimura, Takashi; Otani, Yoshichika; Kinoshita, Toyohiko.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 85, No. 13, 134414, 06.04.2012.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Nonlinear motion of magnetic vortex cores during fast magnetic pulses
AU - Fukumoto, Keiki
AU - Arai, Kuniaki
AU - Kimura, Takashi
AU - Otani, Yoshichika
AU - Kinoshita, Toyohiko
PY - 2012/4/6
Y1 - 2012/4/6
N2 - The time evolution of vortex spin structures in ferromagnetic FeNi disks (4 μm and 6 μm in diameter and thickness of 30 nm) during fast magnetic field pulses was observed by time-resolved x-ray magnetic circular dichroism with photoelectron emission microscopy. For the smaller disk, the displacement of the vortex core was found to linearly follow the field amplitude as described by an analytical model based on Thiele's equation with boundary conditions for patterned magnets. In contrast, for the larger disk which contains a smaller magnetic restoring force, a nonlinear response of the core displacement to the field amplitude, and also a sub-ns delay of the core motion, was observed. In parallel a deformation of the vortex spin structure was observed. Part of the Zeeman energy is stored in deforming the vortex structure during the rise time of the magnetic field with a large ΔH/Δt.
AB - The time evolution of vortex spin structures in ferromagnetic FeNi disks (4 μm and 6 μm in diameter and thickness of 30 nm) during fast magnetic field pulses was observed by time-resolved x-ray magnetic circular dichroism with photoelectron emission microscopy. For the smaller disk, the displacement of the vortex core was found to linearly follow the field amplitude as described by an analytical model based on Thiele's equation with boundary conditions for patterned magnets. In contrast, for the larger disk which contains a smaller magnetic restoring force, a nonlinear response of the core displacement to the field amplitude, and also a sub-ns delay of the core motion, was observed. In parallel a deformation of the vortex spin structure was observed. Part of the Zeeman energy is stored in deforming the vortex structure during the rise time of the magnetic field with a large ΔH/Δt.
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U2 - 10.1103/PhysRevB.85.134414
DO - 10.1103/PhysRevB.85.134414
M3 - Article
AN - SCOPUS:84860210511
VL - 85
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 1098-0121
IS - 13
M1 - 134414
ER -