Magnetization Reversal of Highly Coercive FePt Examined With Pulsed Microcoils

Magnetization Reversal of Highly Coercive FePt Examined With Pulsed Microcoils

The switching of ultra-high coercivity FePt thin films has been studied by pulsed magnetic fields of up to 25 T, generated with microcoils of 50 mum diameter and using a fast magneto-optical polar Kerr effect setup. Whereas under static measurements, the coercive field reaches 5.5 T, under pulsed ma...

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Veröffentlicht in:IEEE transactions on magnetics 2006-10, Vol.42 (10), p.3072-3074
Hauptverfasser: Weisheit, M., Bonfim, M., Grechishkin, R., Barthem, V., Fahler, S., Givord, D.
Format: Artikel
Sprache:eng
Schlagworte:
Coercive force
Condensed Matter
Damping
Equations
FePt
Ferrous alloys
hard magnetic thin films
Intermetallics
Iron compounds
Kerr effect
L10
Magnetic field measurement
Magnetic fields
Magnetic films
Magnetic switching
Magnetism
Magnetization reversal
magneto-optic Kerr effect
Magnetooptic effects
Materials Science
Mathematical analysis
perpendicular magnetic anisotropy
Physics
Platinum compounds
Pulse generation
Pulse measurements
pulsed magnetic fields
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Zusammenfassung:The switching of ultra-high coercivity FePt thin films has been studied by pulsed magnetic fields of up to 25 T, generated with microcoils of 50 mum diameter and using a fast magneto-optical polar Kerr effect setup. Whereas under static measurements, the coercive field reaches 5.5 T, under pulsed magnetic field it approaches 8 T. An approximation of the Landau-Lifshitz-Gilbert (LLG) equation was used to calculate the magnetization response to the field pulse. Good agreement between experiment and simulation is observed if a value of 0.1 is assumed for the damping constant
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2006.880146