Abstract
Magnetic extended x-ray absorption fine structure (MEXAFS) is a helicity-dependent counterpart of the well-established EXAFS technique. By means of MEXAFS it is possible not only to analyze the local magnetic structure but also to learn about magnetic fluctuations. Here temperature-dependent MEXAFS was employed to study the spin fluctuation of a terbium single crystal in a wide temperature range from 10 to 250 K covering two magnetic transitions. As compared with EXAFS, the MEXAFS signal intensity decreases more dramatically with increasing temperature, especially when spin orientation changes from ferromagnetic order to helical structure and paramagnetic order. The strong temperature dependence of MEXAFS is related to the atomic thermal vibrations (probed by EXAFS) and to the reduction of the magnetization at increasing temperatures. To analyze the individual scattering contributions to the MEXAFS and the EXAFS, ab initio calculations have been performed. The strongly enhanced magnetic multiple scattering was observed at low temperature and interpreted on the basis of the exchange interaction model.
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