Title :
Magnetization Reversal of Highly Coercive FePt Examined With Pulsed Microcoils
Author :
Weisheit, M. ; Bonfim, M. ; Grechishkin, R. ; Barthem, V. ; Fähler, S. ; Givord, D.
Author_Institution :
Inst. for Metallic Mater., IFW Dresden
Abstract :
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
Keywords :
Kerr magneto-optical effect; coercive force; coils; iron alloys; magnetic fields; magnetic switching; magnetic thin films; magnetisation reversal; 5.5 T; 50 micron; 8 T; FePt; LLG equation; Landau-Lifshitz-Gilbert equation; coercive field; highly coercive FePt; magnetization response; magnetization reversal; magneto-optical polar Kerr effect; pulsed magnetic fields; pulsed microcoils; static measurements; ultra-high coercivity FePt thin films; Coercive force; Equations; Kerr effect; Magnetic field measurement; Magnetic films; Magnetic switching; Magnetization reversal; Magnetooptic effects; Pulse generation; Pulse measurements; FePt; L10; hard magnetic thin films; magnetic fields; magnetic films; magnetization reversal; magneto-optic Kerr effect; perpendicular magnetic anisotropy; pulsed magnetic fields;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2006.880146
