Tunneling magnetoresistance effect and structure of granular films using CoFeAlSi alloy

摘要

Magnetic granular films have showed a spin dependent tunnel magnetoresistance effect. The TMR ratio depends on the spin polarization of magnetic granules. Half-metallic ferromagnets have a high spin polarization and Co-based full heuslar alloys are attractive materials. We have reported that the granular films using full-Heusler CoFeAlSi(CFAS) alloy and Al_2O_3 showed a large MR ratio of about 18% under a magnetic field of 8 kOe at room temperature. It is considered that this large MR ratio results from high spin polarization of the granules. In this article, we report the TMR effect and the structure of the granular films using CFAS alloy.