Simultaneous determination of Fe 3{ital p} spin-orbit and exchange splittings in photoemission
- Department of Physics, University of Texas, Austin, Texas 78712 (United States)
- Department of Physics, Utah State University, Logan, Utah 84322-4415 (United States)
Spin-resolved core-level photoemission data from the 3{ital p} level of ultrathin Fe films [1.4--5.1 monolayers (ML)] epitaxially grown on W(110) have been obtained. A nonlinear least-squares analysis, based on a one-particle Hamiltonian that simultaneously includes core-valence exchange and core-hole spin-orbit interactions, is developed. It is first tested on Fe 2{ital p} magnetic circular dichroism (MCD) photoemission spectra and shown to successfully describe the MCD asymmetry data. The model is then used to analyze our thin-film 3{ital p} data. With increasing film thickness the spin-orbit splitting (0.67{plus_minus}0.02 eV) remains constant (as expected), the exchange splitting increases from 0{plus_minus}0.12 eV to 0.41{plus_minus}0.05 eV, the average Fe film magnetization (=1.2{plus_minus}0.3{mu}{sub {ital B}} at 1.4 ML) increases, and the singularity index decreases. The analysis highlights the importance of simultaneously considering all relevant photoemission parameters in extracting meaningful values of the spin-orbit and exchange interactions.
- OSTI ID:
- 54928
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 21 Vol. 51; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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