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- W2946509969 abstract "The influence of the amplitude of an external magnetic field ($H$) and femtosecond laser pulse fluence ($F$) on ultrafast magnetization dynamics has been investigated in a ferromagnetic ${mathrm{Ni}}_{54.3}{mathrm{Mn}}_{31.9}{mathrm{Sn}}_{13.8}$ Heusler-alloy film using the time-resolved magneto-optical Kerr effect. A large slowing down of the demagnetization process was observed and characteristic parameters of magnetization precession were determined for a wide range of $H$ and $F$ values. Long demagnetization times of the order of hundreds of picoseconds have been found and explained as a result of the Curie temperature (${T}_{mathrm{C}}$) proximity in the alloy film studied. Effective magnetic anisotropy field (${H}_{text{k}}^{text{eff}}$) and Gilbert damping parameter dependencies were determined. A significant reduction of the precession frequency versus $F$ of the uniform Kittel mode was found. A strong decrease of ${H}_{text{k}}^{text{eff}}$ with $F$ was well simulated in the frame of an extended version of the microscopic three-temperature model (eM3TM), and explained by the ${T}_{mathrm{C}}$ proximity effect. The estimated low values of the eM3TM model parameters, the demagnetization rate and electron-lattice coupling constant, appeared essential to explain the slowing down effect of demagnetization. Precession amplitude dependencies were explained by a phenomenological approach taking into account ${H}_{text{k}}^{text{eff}}$ and changes of the equilibrium magnetization angles induced by pump-pulse excitation." @default.
- W2946509969 created "2019-05-29" @default.
- W2946509969 creator A5007143193 @default.
- W2946509969 creator A5012993320 @default.
- W2946509969 creator A5051292294 @default.
- W2946509969 creator A5053533706 @default.
- W2946509969 date "2019-05-17" @default.
- W2946509969 modified "2023-10-10" @default.
- W2946509969 title "Ultrafast magnetization dynamics in an epitaxial<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:msub><mml:mi>Ni</mml:mi><mml:mrow><mml:mn>54.3</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Mn</mml:mi><mml:mrow><mml:mn>31.9</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Sn</mml:mi><mml:mrow><mml:mn>13.8</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>Heusler-alloy film close to the Curie temperature" @default.
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- W2946509969 doi "https://doi.org/10.1103/physrevb.99.184424" @default.
- W2946509969 hasPublicationYear "2019" @default.
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