Abstract
Using a fast silicon strip detector, a multi-frame acquisition scheme was implemented to perform energy-dispersive X-ray magnetic circular dichroism at the iron K-edge in pulsed high magnetic fields. The acquisition scheme makes use of the entire field pulse. The quality of the signal obtained from samples of ferrimagnetic erbium iron garnet allows for quantitative evaluation of the signal amplitude. Below the compensation point, two successive field-induced phase transitions and the reversal of the net magnetization of the iron sublattices in the intermediate phase were observed.
Highlights
The development of X-ray magnetic circular dichroism (XMCD) in pulsed magnetic fields (PMF) (Mathon et al, 2007) has significantly increased the field range accessible for XMCD studies from the limits of current superconducting magnets to fields of 30 T and beyond
Two different acquisition schemes are currently used to perform XMCD studies in PMF: in energy-scanning XMCD a series of field pulses is performed at each energy, using fast photodiodes and amplifiers capable of following the magnetic field pulse to detect the signal
We have implemented a multi-frame acquisition scheme to perform ED-XMCD in pulsed high magnetic fields. This detection scheme allows the entire field pulse to be followed and combines the high quality of the energy spectra obtained in the dispersive geometry with a good consistency of the field dependence
Summary
The development of X-ray magnetic circular dichroism (XMCD) in pulsed magnetic fields (PMF) (Mathon et al, 2007) has significantly increased the field range accessible for XMCD studies from the limits of current superconducting magnets to fields of 30 T and beyond. Two different acquisition schemes are currently used to perform XMCD studies in PMF: in energy-scanning XMCD a series of field pulses is performed at each energy, using fast photodiodes and amplifiers capable of following the magnetic field pulse to detect the signal. This provides excellent consistency of the magnetic field dependence, while the energy spectra are constructed point by point. The quality of the spectra and of the field dependence of the XMCD amplitude allow for a quantitative evaluation of the Fe K-edge signal amplitude for the study of the Fe sublattice magnetization
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