[22a-12K-1~11] 10.1 Emerging materials in spintronics and magnetics (including fabrication and characterization methodologies)

9:00 AM - 9:15 AM JST(12:00 AM - 12:15 AM UTC)English Presentation

[22a-12K-1] Evaluation of magneto-crystalline anisotorpy K₁ of Co-based Heusler Co₂FeAl_xSi_1-x alloy thin film for highly sensitive TMR sensor

〇Takayuki Hojo¹, Hiromi Hamasaki¹, Masakiyo Tsunoda¹, Mikihiko Oogane¹ (1.Tohoku Univ.)

Keywords:

Heusler alloy

A tunnel magnetoresistance (TMR) sensor is a highly sensitive magnetic sensor workable at room temperature, and its sensitivity is determined from TMR ratio and magnetic anisotropy . Thus, both high TMR ratio and small magnteic anisotropy is required to realize highly sensitve TMR sensor. In this study, we focused on Co-based Heusler alloy Co₂FeAl_xSi_1-x as the free layer of TMR sensors. Magnetic tunnel junctions (MTJs) with these electrodes have been reported to show very high TMR ratio because of their half-metallicity. On the other hand, there is no reports of magnetic anisotoropy of Co₂FeAl_xSi_1-x. In this presentation, we report on systematical investigation of magneto-crystalline anisotropy K₁ of Co₂FeAl_xSi_1-x thin films fabricated by co-sputtering technique.