Andrei Kirulyuk (SIMES Seminar)

Date(s) - Nov 13 2015
11:00 AM - 12:00 PM

Sycamore Room, Building 40, room 195


The role of exchange interaction in all-optical magnetic switching

Andrei Kirilyuk

Radboud University, Institute for Molecules and Materials


In spite of the recent extensive work on all-optical switching of magnetization in a variety of samples [1-4], confusion persists as to its mechanism. Here I will discuss, that this confusion may be largely due to the fact that this phenomenon involves behavior on multiple scales, both in space and time. At 100’s fs, independent demagnetization of sublattices is observed accompanied by spin diffusive processes at <10 nm distances, as shown by time-resolved X-ray scattering [5]. This is followed by the exchange spring driven behavior [2] with reversal and formation of skyrmion-like domains [6] at a few tens of ps times.

In order to tune the exchange interaction between the sublattices, the alloyed samples were replaced with multilayers. Intriguingly, very large scale coherent precession could be observed that accompany the growth of large domains [7]. The presence of the compensation point added an extra spatial feature to the reversal dynamics in the multilayer samples.

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1. Stanciu C.D. et al., Phys. Rev. Lett. 99, 047601 (2007).

2. Kirilyuk A., Kimel A.V., and Rasing Th. Rep. Prog. Phys. 76 , 026501 (2013)

3. Lambert, C.-H. et al, Science 345, 1337 (2014).

4. Mangin S. et al., Nature Materials 13, 287 (2014).

5. Graves C.E. et al., Nature Materials 12, 293 (2013)

6. Finazzi M. et al., Phys. Rev. Lett. 110, 177205 (2013)

7. Savoini M., Tsema Y. et al, submitted