dr. Alexej Kimel: Femtosecond opto-magnetism: Controlling and Harnessing the Fundamental Forces in Magnets
|Wanneer:||vr 16-01-2015 11:00 - 12:00|
The idea to change properties of media with the help of light has long intrigued people in physics and chemistry. Understanding the mechanisms leading to photo-induced magnetic phenomena is a particularly intriguing problem as the strongest perturbation in light-matter interaction - the effect of the electric field of light on electric charges - conserves the spin. In my talk I will discuss how to control spins in magnets with the help of femtosecond laser pulses [1,2]. It will be shown that the laser pulses can effectively manipulate spins via ultrafast effect on spin-orbit  and exchange interactions [3,4] in magnetic materials. The effects are truly non-dissipative being observed even if the laser pulse is not absorbed . I will also discuss scenarios in which the strength of the opto-magnetic effects can be employed to achieve ever faster magnetic switching .
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