Laser induced magnetization switching in films with perpendicular anisotropy : a comparison between measurements and a multi-macrospin model

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2009
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Bunce, Christopher
Wu, Jing
Ju, Ganping
Lu, Bin
Kazantseva, Natalia
Chantrell, Roy W.
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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/cm2 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.

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ISO 690BUNCE, Christopher, Jing WU, Ganping JU, Bin LU, Denise HINZKE, Natalia KAZANTSEVA, Ulrich NOWAK, Roy W. CHANTRELL, 2009. Laser induced magnetization switching in films with perpendicular anisotropy : a comparison between measurements and a multi-macrospin model
BibTex
@unpublished{Bunce2009Laser-9047,
  year={2009},
  doi={10.1103/PhysRevB.81.174428},
  title={Laser induced magnetization switching in films with perpendicular anisotropy : a comparison between measurements and a multi-macrospin model},
  author={Bunce, Christopher and Wu, Jing and Ju, Ganping and Lu, Bin and Hinzke, Denise and Kazantseva, Natalia and Nowak, Ulrich and Chantrell, Roy W.}
}
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