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Laser Induced Magnetization Switching in Films with Perpendicular Anisotropy: a Comparison Between Measurements and a Multi-macrospin Model by Bunce, C.; Wu, J.; Ju, G.; Lu, B.; Hinzke, D.; Kazantseva, N.; Nowak, U.; Chantrell, R. W. is a scholarly article available to read on EtoBox.

What is Laser Induced Magnetization Switching in Films with Perpendicular Anisotropy: a Comparison Between Measurements and a Multi-macrospin Model about?

Thermally-assisted ultra-fast magnetization reversal in a DC magnetic field for magnetic multilayer thin films with perpendicular anisotropy has been investigated in the time domain using femtosecond laser heating. The experiment is set-up as an optically pumped stroboscopic Time Resolved Magneto-Optical Kerr Effect magnetometer. It is observed that a modest laser fluence of about 0.3 mJ/square-cm induces switching of the magnetization in an applied field much less than the DC coercivity (0.8 T) on the sub-nanosecond time-scale. This switching was thermally-assisted by the energy from the femtosecond pump-pulse. The experimental results are compared with a model based on the Landau Lifschitz Bloch equation. The comparison supports a description of the reversal process as an ultra-fast demagnetization and partial recovery followed by slower thermally activated switching due to the spin system remaining at an elevated temperature after the heating pulse.

Author

Bunce, C.; Wu, J.; Ju, G.; Lu, B.; Hinzke, D.; Kazantseva, N.; Nowak, U.; Chantrell, R. W.

Published

2009

Language

EN