Imaging the Ultrafast Spin-Lattice Motion During Ultrafast All-Optical Switching of Ferromagnets
Dr. Hermann A. Durr
SLAC National Accelerator Laboratory, USA.
Date & Time: 15:30 - 16:30, July 16th (Thu), 2015.
Place: 8F Medium Seminar Room(#811-812), Sengen
Abstract:
Understanding the ultrafast interplay between charge, magnetic and lattice degrees of freedom is central to gaining control of condensed matter phenomena as diverse as insulator-metal transitions and magnetic switching. Although magnetism in metallic systems is expected to couple only weakly to phonons, the observed ultrafast demagnetization [1] and all-optical magnetic switching demonstrate just the opposite [2,3]. Femtosecond soft x-ray pulses from the Linac Coherent Light Source, offer the unique opportunity to image in real time the ultrafast spin dynamics that leads to magnetization reversal [4]. Hard x-rays and fs electron pulses enable first glimpses at the laser-induced lattice motion revealing unexpected spin-lattice relaxation channels. Understanding the evolving spin-lattice motion on the fs time and nm length scales associated with the exchange interaction opens new possibilities of engineering angular momentum relaxation channels in
magnetic systems.
References
[1] E. Beaurepaire, et al., Phys. Rev. Lett, 76, 4250 (1996).
[2] C.D. Stanciu et al., Phys. Rev. Lett, 99, 047601 (2007).
[3] S. Mangin, et al. Nature Materials 13, 286 (2014).
[4] C. E. Graves, A. H. Reid et al., Nature Materials, 12, 293 (2013).
References
[1] E. Beaurepaire, et al., Phys. Rev. Lett, 76, 4250 (1996).
[2] C.D. Stanciu et al., Phys. Rev. Lett, 99, 047601 (2007).
[3] S. Mangin, et al. Nature Materials 13, 286 (2014).
[4] C. E. Graves, A. H. Reid et al., Nature Materials, 12, 293 (2013).