ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Magnetic circular dichroism (MCD) in core-level absorption provides insights into the element-specific and site-selective magnetic states of various magnetic materials. Fe7S8 and Fe7Se8 have the pseudo-NiAs-type crystal structure and are ferrimagnetic below 578 and ∼450 K, respectively. We have measured MCD spectra in the Fe 2p (L2,3) and Fe 3p (M2,3) core-level absorption of these compounds. The L2,3 MCD spectra were taken at ∼80 K with the total electron yield method. The M2,3 MCD spectra were measured at room temperature with the reflection method using the magnetic-field modulation technique. Both experiments were made using circularly polarized undulator radiation. The L2,3 MCD spectra were found to exhibit a negative peak at the L3 edge with a maximum intensity of ∼10−2 and a weaker positive peak at the L2 edge. The MCD spectrum of Fe7S8 showed sideband features near the L3 edge. Utilization of the magnetic-field modulation method allowed a detection of small MCD signals around the M2,3 edges; the maximum signal intensity was of the order of ∼3×10−3. The M2,3 MCD spectrum of Fe7S8 showed a MCD signal for a prethreshold multiplet, while that of Fe7Se8 exhibited no appreciable MCD signal for a prethreshold multiplet. The features observed in the L2,3 MCD and M2,3 MCD are consistent with an electronic band-structure calculation reported recently. © 1996 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.362225
