X-ray ferromagnetic resonance spectroscopy[EPFL]

mt7344

We present a method to measure continuous-wave ferromagnetic resonance
FMR spectra based on
. r( I. T( Y% ^/ s* A. s& M6 }the core-level absorption of circularly polarized x rays. The technique is demonstrated by using a
4 W9 ]6 Q( `, Z( z' G( F/ A5 ymonochromatic x-ray beam incident on an yttrium–iron–garnet sample excited by a microwave field
at 2.47 GHz. FMR spectra are obtained by monitoring the x-ray absorption intensity at the photon
% W. m( J  d9 f7 y9 x, E& B/ Henergy corresponding to the maximum of the magnetic circular dichroism effect at the iron L2,3
/ y5 w: v# o! f2 z! M7 uedges as a function of applied magnetic field. The x-ray FMR signal is shown to be energy
dependent, which makes the technique element sensitive and opens up new possibilities to perform
2 r- v) p, C3 r7 O# h( ^element-resolved FMR in magnetic alloys and multilayers.
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[ 本帖最後由 mt7344 於 2007-6-9 07:00 PM 編輯 ]