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Magnetization reversal by means of an ultrafast laser pulse

Magnetization reversal by means of an ultrafast laser pulse - image 

Free electron lasers generate pulses as short as femtoseconds (one-millionth of a milliardth of a second), capable of taking ultra-fast snapshots of physical systems.

In this experiment, two 100-femtoseconds pulses were used, one to excite the magnetic system by local heating (pump) and another one (probe) to measure the magnetization changes induced by the first one. It was demonstrated that a single optical laser pulse can reverse the Fe magnetizations locally.

Innovation dimension: All-optical switching of magnetization in thin magnetic filmsis an attractive perspective for applications in sensors and devices.

Magnetization reversal by means of an ultrafast laser pulse - image

Magnetization sensitive specular reflectivity of p-polarized FEL radiation tuned at Fe 3p resonance. A magnetic pulse saturates the Fe magnetization in the high reflectivity state (MFe+). When a single pump-laser pulse of 100 fs duration reaches the sample, reflectivity drops towards the MFe- value.

 

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Maurizio Sacchi: maurizio.sacchi@elettra.eu

Carlo Spezzani: carlo.spezzani@elettra.eu

Elettra - Sincrotrone Trieste S.C.p.A. 34149 Trieste, Italy and

Laboratory of Quantum Optics, University o Nova Gorica, 5001 Nova Gorica, Slovenia

 
 
last update by cblasetti on 7/23/2015 2:31:14 PM

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