- Conference date: 23-27 Aug 1999
- Location: Chicago, Illinois (USA)
We review first the principles of the X-ray magnetic circular dichroism (XMCD) which will be used to investigate the magnetic properties of Europium Chalcogenides. These compounds are good models of magnetism in solids and were selected to illustrate the potentialities and limitations XMCD at high excitation energy. A thorough analysis of the Eu L-edges XMCD spectra allowed us to identify several effects which, if they are not properly taken into account, may cause the failure of the magneto-optical sum rules at the L-edge of rare-earths. These effects include: (i) the exchange splitting of the core states; (ii) the crystal field splitting of the final states, and (iii) the strong quadrupolar contributions to the XMCD spectra. It is also shown that Magnetic EXAFS measurements at the Eu L-edges combined with XMCD studies at the Chalcogen K-edges produce strong evidence that the highly localized moments of Eu are indirectly coupled via the magnetically polarized p-states of the anions. This is the first time that such magnetic interactions mediated by the anions are unambiguously detected by X-ray absorption spectroscopy.
- Magnetooptical effects
- Classical Heisenberg model
- Magnetic circular dichroism spectroscopy
- Crystal field splitting
Data & Media loading...
Article metrics loading...