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Publication Citation: Ultrafast element-specific magnetization Dynamics of complex magnetic materials on a table-top

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Author(s): Thomas J. Silva; Justin M. Shaw; Hans T. Nembach; Chan La-O-Vorakiat; Henry C. Kapteyn; Margaret M. Murnane; Stefan Mathias; Roman Adam; Patrik Grychtol; Martin Aeschlimann; Claus M. Schneider; Emrah Turgut; Dennis Rudolf;
Title: Ultrafast element-specific magnetization Dynamics of complex magnetic materials on a table-top
Published: December 21, 2012
Abstract: We review recent progress in femtosecond magnetization dynamics probed by extreme ultraviolet pulses from high-harmonic generation. In a transverse magneto-optical Kerr geometry, we establish an ultrafast, element-specific experimental capability - on a table-top - for the measurement of magnetization dynamics in complex multi-sublattice magnets and multilayer magnetic structures. We show that this newly introduced technique is an artifact-free magnetic sensor, with only negligible non-magnetic (optical) contributions from the transient variation of the refractive index due to the presence of a non equilibrium hot-electron distribution. We then use these new experimental capabilities of ultrahigh time-resolution, combined with element-specific simultaneous probing, to disentangle important microscopic processes that drive magnetization dynamics on femtosecond timescales. We elucidate the role of exchange interaction on magnetization dynamics in strongly exchange-coupled alloys, and the role of photo-induced superdiffusive spin currents in magnetic multilayer stacks.
Citation: IEEE Transactions on Magnetics
Volume: 103
Pages: 4 pp.
Keywords: High-harmonic generation,magneto-optical Kerr effect,demagnetization,femtosecond magnetism
Research Areas: Physics, Condensed Matter Physics, Optical Physics