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Abstract:
We report on the properties of thin films of the full Heusler compound
Co2TiSn prepared by dc magnetron co-sputtering. Fully epitaxial,
stoichiometric films were obtained by deposition on MgO (001) substrates
at substrate temperatures above 600 degrees C. The films are well
ordered in the L2(1) structure, and the Curie temperature slightly
exceeds the bulk value. They show a significant, isotropic
magnetoresistance and the resistivity becomes strongly anomalous in the
paramagnetic state. The films are weakly ferrimagnetic, with nearly 1
mu(B) on the Co atoms, and a small antiparallel Ti moment, in agreement
with theoretical expectations. From comparison of x-ray absorption
spectra on the Co L-3,L-2 edges, including circular and linear magnetic
dichroism, with ab initio calculations of the x-ray absorption and
circular dichroism spectra we infer that the electronic structure of
Co2TiSn has essentially nonlocalized character. Spectral features that
have not been explained in detail before are explained here in terms of
the final-state band structure.
