Thermal Reversal of Magnetic Grains Under Time Varying Pulse Field

Media thermal magnetization switching under an arbitrary time varying field, pulse shape, and duration is an important issue in many recording applications. This paper shows a scale dilemma in using the time dependent energy barrier approach to describe long time thermal reversal of magnetic grains...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2006-10, Vol.42 (10), p.2294-2296
Main Authors: Wang, X., Fernandez-de-Castro, J., Gao, K., Jin, Z.
Format: Article
Language:English
Subjects:
Coercive force
Cross-disciplinary physics: materials science
rheology
Energy barrier
Energy use
Exact sciences and technology
Frequency
Grains
Magnetic anisotropy
Magnetic fields
Magnetic recording
Magnetic switching
Magnetism
Magnetization
Materials science
Mathematical models
Optimal reversal path
Optimization
Other topics in materials science
Perpendicular magnetic anisotropy
Physics
Pulse shape
Recording
Switching
Thermal stability
thermal switching
time varying field
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Summary:Media thermal magnetization switching under an arbitrary time varying field, pulse shape, and duration is an important issue in many recording applications. This paper shows a scale dilemma in using the time dependent energy barrier approach to describe long time thermal reversal of magnetic grains under a time varying pulse field. A new model approach based on an optimal reversal path is proposed to characterize the thermal reversal behavior of magnetic grains under an arbitrary time varying pulse field. Using this new model approach, the effects of pulse field duration, width, and amplitude on magnetic grain thermal switching behavior are studied
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2006.878657