Magnetization reversal in individual micrometer-sized polycrystalline Permalloy rings

Moore, TA, Hayward, TJ, Tse, DHY, Bland, JAC, Castano, FJ and Ross, CA (2005) Magnetization reversal in individual micrometer-sized polycrystalline Permalloy rings. Journal of Applied Physics, 97 6: 164-167. doi:10.1063/1.1858055

Author Moore, TA
Hayward, TJ
Tse, DHY
Bland, JAC
Castano, FJ
Ross, CA
Title Magnetization reversal in individual micrometer-sized polycrystalline Permalloy rings
Journal name Journal of Applied Physics   Check publisher's open access policy
ISSN 0021-8979
Publication date 2005-01-01
Year available 2006
Sub-type Article (original research)
DOI 10.1063/1.1858055
Open Access Status Not yet assessed
Volume 97
Issue 6
Start page 164
End page 167
Total pages 5
Place of publication Melville, NY, United States
Publisher A I P Publishing LLC
Language eng
Formatted abstract
The magnetization reversal of individual 2 μm and 5 μm diameter polycrystalline Permalloy rings, with respective widths 0.75 μm and 1 μm, thickness 45 nm, has been investigated by focused magneto-optic Kerr effect (MOKE) magnetometry. Micromagnetic simulation of the reversal in the 2 μm diameter ring reveals that the onion-to-vortex state switching occurs by nucleation and subsequent annihilation of vortex walls that span the width of the ring, and that the vortex-to-reverse-onion state switching occurs by expansion of a reverse domain. The hysteresis loop shows good agreement with the experimental MOKE loop. Measurements of the switching through one-half of a 5 μm diameter ring enable the determination of the circulation of the vortex states accessed during one applied field cycle. The rings switch via one vortex state (either clockwise or anticlockwise) on both downward and upward applied field sweeps. The number of applied field cycles spent switching via one vortex state before changing to switch via the opposite vortex state is random, likely to be due to the history of the spin configuration and thermal fluctuations.
Keyword Physics, Condensed Matter
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Centre for Advanced Imaging Publications
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