Open AccessXMCD under pressure at the Fe K edge on the energy‐dispersive beamline of the ESRF
Author(s) -
Mathon O.,
Baudelet F.,
Itié J.P.,
Pasternak S.,
Polian A.,
Pascarelli S.
Publication year - 2004
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049504018862
Subject(s) - magnetic circular dichroism , beamline , x ray absorption spectroscopy , enhanced data rates for gsm evolution , xanes , absorption edge , diamond anvil cell , diamond , k edge , materials science , x ray magnetic circular dichroism , condensed matter physics , high pressure , spectroscopy , absorption spectroscopy , atomic physics , optics , physics , band gap , engineering physics , spectral line , metallurgy , telecommunications , beam (structure) , quantum mechanics , astronomy , computer science
The present paper demonstrates the feasibility of X‐ray absorption spectroscopy (XAS) and X‐ray magnetic circular dichroism (XMCD) at high pressure at the Fe K edge on the ID24 energy‐dispersive beamline of the ESRF. In 3 d transition metals, performing experiments at the hard X‐ray K edge rather than at the magnetically interesting soft X‐ray L edges represents the only way to access the high‐pressure regime obtainable with diamond anvil cells. The simultaneous availability of a local structure (XAS) and of a magnetic (XMCD) probe on the sample under identical thermodynamical conditions is essential for studying correlations between local structural and magnetic properties. The state‐of‐the‐art theoretical understanding of K ‐edge XMCD data is briefly summarized, and the set‐up of beamline ID24 for high‐pressure XMCD experiments is illustrated and the conditions required to perform measurements at the K edges of 3 d transition metals are underlined. Finally, two examples of recent high‐pressure results at the Fe K edge in pure Fe and Fe 3 O 4 powder are presented.