6533b824fe1ef96bd127fe8a

RESEARCH PRODUCT

Temperature dependence of x-ray absorption spectra in the ferromagnetic Heusler alloysMn2VAlandCo2FeAl

E. Arbelo JorgeP. KlaerWenhong WangK. InomataH. J. ElmersHiroaki SukegawaMartin Jourdan

subject

Materials scienceCondensed matter physicsAbsorption spectroscopyMagnetic circular dichroismFEALFermi energyCondensed Matter PhysicsElectronic Optical and Magnetic Materialssymbols.namesakeFerromagnetismFerrimagnetismDensity of statessymbolsFermi–Dirac statistics

description

We investigate the temperature dependence of the spin-resolved unoccupied density of states (DOS) in ferromagnetic ${\text{Co}}_{2}\text{FeAl}$ and ferrimagnetic ${\text{Mn}}_{2}\text{VAl}$ epitaxial films on MgO(100) using x-ray magnetic circular dichroism. We observe an unexpected strong temperature dependence of the DOS beyond the change expected from the Fermi distribution function. An increase in spectral weight is observed for majority states below the Fermi energy in the case of ${\text{Mn}}_{2}\text{VAl}$ and for minority states above the Fermi energy in the case of ${\text{Co}}_{2}\text{FeAl}$. Reduced atomic order near the interface suppresses the unexpected temperature dependence of the DOS for ${\text{Mn}}_{2}\text{VAl}$.

https://doi.org/10.1103/physrevb.82.024418