FEMTOSPEX-Magnetism
Femto-Second-Pump-Probe
Methods
NEXAFS, Time-resolved absorption, XMCD, XMLD
Remote access
not possible
Station data | |
---|---|
Temperature range | 30 - 450 K (low-T), 130 - 750 K (variable T) |
Pressure range | <= 10E-7 mbar |
Detector | GaAs Photodiode, gated Avalanche Photodiode (1 ns) |
Manipulators | Low-Temprerature (He) cryostat, variable temperature cryostat |
Sample holder compatibility | Omicron or compatible |
Additional equipment | |
Magnetic field (longitudinal) | .5 Tesla |
Magnetic field (transverse) | .04 Tesla |
Applicable at beamline(s) | |
PM3 | 20 - 1900 eV |
UE52_SGM | 100 - 1500 eV |
UE56-1_PGM | 60 - 1300 eV |
UE112_PGM-1 | 8 - 690 eV; for extreme values (<50 eV or >400 eV) contact the beamline crew |
Experimental station for fs time resolved XMCD and XAS
The FEMTOSPEX XMCD/XAS experimental station was set up in 2004 for the proof-of-principle Femtoslicing experiments and has since then been a workhorse for both in-house research and user operation at the HZB. It has been built particularly for time-resolved XAS and XMCD measurements in transmission, coping with the reduced photon flux in fs time resolved experiments. The main scientific focus is on ultrafast magnetization dynamics and time-resolved X-ray absorption spectroscopy.
The experimental setup for laser pump – X-ray probe on magnetic samples consists of a measurement chamber housing the magnet and transmission sample, and the detector chamber with a fast avalanche photodiode (APD). Laser and X-ray beams enter through the beamline flange under an angle of 1.5° (almost collinear). An Al foil mounted between the chambers prevents laser light to enter the detection chamber with the APD.