Anisotropic magnetoresistance effect in Co2(Fe-Mn)(Al-Si) Heusler alloy thin films

In this research, we measured anisotropic magnetoresistance (AMR) effect of the Co₂(Fe-Mn)(Al-Si) (CFMAS) Heusler alloy thin films . The AMR effect is a resistance change depending on the relative angle between the magnetization vector and the direction of the current flow . Kokado et al ., reported systematic analysis of the AMR effects in the Fe, Co, Ni, and Fe₄N. According to their theory, sign of the AMR effect becomes negative due to the absence of spin-flip-s-d scattering process of the conduction electron, which suggests a negative AMR effect in half-metallic materials . After the report by Kokado et al ., Sakuraba et al ., discussed correlation between AMR effect and current-perpendicular to plane giant magnetoresistance (CPP-GMR) ratio of some Co-based full Heusler alloys . According to their results, there was a correlation between the negative sign of the AMR effect and the half-metallic nature of the Heusler alloys, which is consistent with the Kokado´s prediction . Thus, we purposed to investigate AMR effect as well as the structural and magnetic properties of CFMAS Heusler alloy thin films for inspecting a possibility of the half-metallic nature of this compound.