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Published on: March 24, 2019
Ultrafast optical parametric pumping of magnetization reorientation and precessional dynamics in DyFe2/YFe2 exchange
L R Shelford1, Y Liu1, U Al-Jarah1
1School of Physics, University of Exeter, Stocker Road, Exeter, Devon EX4 4QL, United Kingdom.
Abstract:
The magnetization dynamics of a wound [DyFe(2)(20 Å)/YFe(2)(80 Å)](×40) exchange spring multilayer have been explored in optical pump probe experiments. Ultrafast optical heating was used to modify the magnetic parameters of the multilayer, while the time resolved magneto-optical Kerr effect was used to probe its response. Although the probe signal is dominated by precession and winding of the exchange spring within the soft YFe(2) layer, reorientation of the DyFe(2) hard-layer magnetization is detected on time scales less than 100 ps. Micromagnetic simulations reproduce the main features of the experimental data and indicate a dramatic optically induced reduction of the hard-layer anisotropy. The results establish the feasibility of switching a spring system by means of parametric excitation.
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