Element-specific magnetic properties of Co(2)(Mn(1-x)Fe(x))Si films probed by x-ray magnetic circular/linear dichroism
2011 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 84, no 5, 054448- p.Article in journal (Refereed) Published
Element-specific magnetic properties of epitaxial Co(2)Fe(x)Mn(1-x)Si/MgO(100) Heusler films prepared by laser ablation are measured by circular dichroism in x-ray absorption spectroscopy (XMCD). Surface and bulk magnetization of the 100-nm-thick films are equal as tested by comparing the total electron yield and transmission measurements and follow the generalized Slater-Pauling rule. For Co(2)FeSi, the large magnetization of 6 mu(B) per formula unit indicates half-metallic behavior. Calculations using the local spin density approximation (LDA) result in a half-metallic band structure for this compound when an additional electron-electron-correlation correction (LDA + U) is considered. Simulated XMCD spectra using the LDA and LDA + U approaches are compared to the experimental spectra. While the electron-electron Coulomb correlation has only a small effect on the observable XMCD spectra, the calculations predict that it will cause a significant change in the x-ray magnetic linear dichroism (XMLD).
Place, publisher, year, edition, pages
2011. Vol. 84, no 5, 054448- p.
IdentifiersURN: urn:nbn:se:uu:diva-158312DOI: 10.1103/PhysRevB.84.054448ISI: 000293829800008OAI: oai:DiVA.org:uu-158312DiVA: diva2:439113