Magnetization dynamics: the first picosecond
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1 Magnetization dynamics: the first picosecond Hermann A. Dürr What is the time scale for angular momentum conservation between spin, orbital and lattice degrees of freedom? laser magneto-optical data storage What is the ultimate writing speed of magnetic data storage devices? Requirements for fs FEL radiation
2 Einstein - de Haas Effect apply magnetic field
3 Einstein - de Haas Effect apply magnetic field
4 Einstein - de Haas Effect lattice apply magnetic field transfer of angular momentum between and lattice t s-l ~ 100ps
5 Laser induced demagnetization laser magneto-optical data storage?
6 Laser induced demagnetization laser magneto-optical data storage stationary lattice??? what happens to angular momentum on an ultrafast time scale?
7 Femtosecond evolution of Ni electronic structure photoemission 6 ev = 6 ev 1.5 ev Ni film Intensity 1ps 0ps -0,2 0,0 0,2 E-E F (ev) Rhie, Dürr, Eberhardt, PRL 90, (2003)
8 Femtosecond evolution of Ni electronic structure 2000 electron temperature photoemission 6 ev = 6 ev 1.5 ev Ni film 1600 T e (K) ~1ps Intensity 1ps time delay (ps) 0ps -0,2 0,0 0,2 E-E F (ev) Rhie, Dürr, Eberhardt, PRL 90, (2003)
9 Femtosecond evolution of Ni electronic structure 2000 electron temperature photoemission -90 exchange coupling T e (K) ~1ps time delay (ps) Intensity 1ps 0ps binding energy (mev) ~300fs time delay (fs) -0,2 0,0 0,2 E-E F (ev) Rhie, Dürr, Eberhardt, PRL 90, (2003)
10 Ultrafast energy relaxation in Ni Evolution of many particle interactions
11 Ultrafast energy relaxation in Ni spin-orbit transfer of angular momentum ~ 300 fs Evolution of many particle interactions
12 Ultrafast energy relaxation in Ni spin-orbit transfer of angular momentum ~ 300 fs Evolution of many particle interactions ~ 1ps? phonons spin-lattice transfer of angular momentum
13 FEL requirements ~ 300 fs ~ 1ps phonons
14 FEL requirements temporal resolution and pump-probe synchronization ~ 300 fs Photoemission spectroscopy <0.1eV <10fs ~ 1ps phonons
15 FEL requirements temporal resolution and pump-probe synchronization ~ 300 fs ~ 1ps Photoemission spectroscopy <0.1eV <10fs transform limited FEL pulses of reproducible shape! HGHG VUV FEL phonons
16 FEL requirements temporal resolution and pump-probe synchronization XMCD ~0.1eV <30fs ~ 300 fs ~ 1ps Photoemission spectroscopy <0.1eV <10fs transform limited FEL pulses of reproducible shape! HGHG VUV FEL phonons
17 FEL requirements temporal resolution and pump-probe synchronization ~ 300 fs XMCD ~0.1eV <30fs HGHG soft x-ray FEL reproducible FEL pulse shape! ~ 1ps Photoemission spectroscopy <0.1eV <10fs transform limited FEL pulses of reproducible shape! HGHG VUV FEL phonons
18 FEL requirements temporal resolution and pump-probe synchronization ~ 300 fs XMCD ~0.1eV <30fs HGHG soft x-ray FEL reproducible FEL pulse shape! ~ 1ps Photoemission spectroscopy <0.1eV <10fs transform limited FEL pulses of reproducible shape! HGHG VUV FEL phonons Surface <100fs x-ray diffraction; match pump/probe volume
19 FEL requirements temporal resolution and pump-probe synchronization ~ 300 fs XMCD ~0.1eV <30fs HGHG soft x-ray FEL reproducible FEL pulse shape! ~ 1ps Photoemission spectroscopy <0.1eV <10fs transform limited FEL pulses of reproducible shape! HGHG VUV FEL phonons Surface <100fs XFEL x-ray diffraction; match pump/probe volume seeded FEL, pulses <<100fs
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