Abstract
We present a novel setup to measure the transverse magneto-optical Kerr effect in the extreme ultraviolet spectral range based on a fiber laser amplifier system with a repetition rate between 100 and 300 kHz, which we use to measure element-resolved demagnetization dynamics. The setup is equipped with a strong electromagnet and a cryostat, allowing measurements between 10 and 420K using magnetic fields up to 0.86T. The performance of our setup is demonstrated by a set of temperature- and time-dependent magnetization measurements with elemental resolution.
Highlights
In the last few decades, magneto-optical spectroscopy has led to an impressive series of discoveries in ultrafast magnetism, spanning from the discovery of optically induced ultrafast manipulation of magnetic order1,2 to the experimental verification of the theoretically predicted existence of femtosecond spin currents3–5 and optically induced spin transfer.6–13 a complete and thorough understanding of the phenomena on a microscopic scale is still an area of active research
We present a novel extreme ultraviolet (EUV) transverse magneto-optical Kerr effect (T-MOKE) experiment based on a high-repetition-rate fiber laser system to drive the highharmonic generation
Thin-film perovskite manganites exhibit rich phase diagrams due to the strong correlations between the charge, lattice, and spin degrees of freedom,39–41 which can be of particular interest for ultrafast spin dynamics
Summary
In the last few decades, magneto-optical spectroscopy has led to an impressive series of discoveries in ultrafast magnetism, spanning from the discovery of optically induced ultrafast manipulation of magnetic order to the experimental verification of the theoretically predicted existence of femtosecond spin currents and optically induced spin transfer. a complete and thorough understanding of the phenomena on a microscopic scale is still an area of active research. The use of ultrashort extreme ultraviolet (EUV) light pulses to probe the instantaneous magnetization enables both few femtosecond time resolution and the possibility to disentangle the contributions of individual elemental components of the probed system.. HHG combines a compact, laboratory-scale light source with excellent properties of the EUV light, such as a high degree of coherence, a broad bandwidth, and ultrashort pulse durations in the low-femtosecond to attosecond regime, allowing state-of-the-art time resolution in pump–probe experiments. In comparison to alternative short-pulse EUV light sources, such as free-electron lasers and femtoslicing synchrotrons, generation of a stable EUV source with high average power is challenging. In this regard, several approaches based on high-repetition-rate, high-power lasers have recently been developed.. We are able to apply high magnetic fields of up to 0.86 T and temperatures between 10 and 420 K in our setup
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