Berlin 2018 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 6: Ultrafast magnetism I

MA 6.6: Vortrag

Montag, 12. März 2018, 11:00–11:15, EB 407

Ultra-fast control of the magnetic order of materials by laser light — •Sangeeta Sharma¹, John Kay Dewhurst¹, Peter Elliott¹, Sam Shallcross², and E. K. U. Gross¹ — ¹Max Planck Inst. of micro structure physics, Halle, Germany — ²Lehrstuhl fuer Theoretische Festkoerperphysik, Erlangen University, Erlangen, Germany

By creating via pump laser pulse a non-equilibrium distribution of charge on sub-exchange time scales (i.e., faster than the time scale associated with spin flip in the ground state) we demonstrate that a precise control of magnetic structure is possible on ultra-short time scales, including switching of spin order from anti-ferromagnetic (AFM) to transient ferromagnetic (FM). The microscopic physics of this ultra-fast spin modulation is dominated by charge flows created by spin-preserving optical excitations, one of the fastest means of manipulating an electronic system by light. We demonstrate this mechanism to be universally applicable to AFM, FM, multilayers and bulk systems, and provide three rules that encapsulate the laser induced early time magnetization dynamics of multi-sub-lattice systems.