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2016 ; 6
(ä): 22767
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Model of THz Magnetization Dynamics
#MMPMID26956997
Bocklage L
Sci Rep
2016[Mar]; 6
(ä): 22767
PMID26956997
show ga
Magnetization dynamics can be coherently controlled by THz laser excitation,
which can be applied in ultrafast magnetization control and switching. Here,
transient magnetization dynamics are calculated for excitation with THz magnetic
field pulses. We use the ansatz of Smit and Beljers, to formulate dynamic
properties of the magnetization via partial derivatives of the samples free
energy density, and extend it to solve the Landau-Lifshitz-equation to obtain the
THz transients of the magnetization. The model is used to determine the
magnetization response to ultrafast multi- and single-cycle THz pulses. Control
of the magnetization trajectory by utilizing the THz pulse shape and polarization
is demonstrated.