Magnetotransport in Co$_2$TiSn

The Heusler alloy Co$_2$TiSn is a ferromagnet with a Curie temperature of 355K. Our theoretical predictions by CASTEP as well as calculations done by others \footnote{A. Yamasaki et al., Phys. Rev. B {\bf 65}, 104410 (2002). } show a high spin polarisation in the conduction band making it a promising candidate for a metallic spin injector. We study its magnetotransport properties as well as MOKE and magnetisation data on bulk crystals and find a large anomalous Hall coefficient indicating a significant spin-orbit coupling. We compliment our theoretical band structure calculations with point contact probe measurements between the magnetic metal surface and a superconducting tip to obtain the spin polarisation at the Fermi energy.