標題: X-ray ferromagnetic resonance spectroscopy[EPFL] [打印本頁] 作者: mt7344 時間: 2007-6-9 06:56 PM 標題: X-ray ferromagnetic resonance spectroscopy[EPFL] We present a method to measure continuous-wave ferromagnetic resonance FMR spectra based on" T- i: g9 c! `( ~4 X$ Y
the core-level absorption of circularly polarized x rays. The technique is demonstrated by using a% R+ s8 G. i5 B( _( e1 \( Q" t
monochromatic x-ray beam incident on an yttrium–iron–garnet sample excited by a microwave field- q* B' t Z+ @& m" Z
at 2.47 GHz. FMR spectra are obtained by monitoring the x-ray absorption intensity at the photon % F8 K) k* c/ yenergy corresponding to the maximum of the magnetic circular dichroism effect at the iron L2,3 ' u) q+ v- `& ^; hedges as a function of applied magnetic field. The x-ray FMR signal is shown to be energy " h$ m, F0 ~& k [( Pdependent, which makes the technique element sensitive and opens up new possibilities to perform 2 H; ?& @0 ?( R/ ~1 _element-resolved FMR in magnetic alloys and multilayers. * g4 P, m7 |" |: T# Z3 _( ~' y4 k( Z6 `2 y- z9 x; h, ^% C) R- H
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