ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Systematic studies of the magnetic or spin-dependent EXAFS (SPEXAFS) were performed at the L2/3 edges of Eu3Fe5O12, Gd and Tb metal and the alloy Ho20Gd80. The magnetic absorption exhibits distinct EXAFS structure, more pronounced than the nonmagnetic EXAFS. The Fourier transform of the Eu L2/3-edges SPEXAFS spectra, which are measured with an accuracy of less than 5×10−5, show a complete disappearance of the oxygen peak. This allows an identification of the positions of the magnetic neighbors for a significantly longer range as it is possible by using the conventional EXAFS profile. Studies of the alloy Ho20Gd80 at the L2/3 edges of both components, which show no significant differences in the polarization averaged EXAFS, indicate an essential influence of the spin structure at the absorbing atom on the magnetic EXAFS spectrum. At the L3 edge of Gd and Tb metal (both of hcp structure) we found similar structures in the conventional as well as in the magnetic EXAFS. The data are interpreted in terms of the sensibility of the SPEXAFS on the angular momentum of the absorbing and neighboring atoms.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.353727
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