[23p-A201-1~11] 10.2 Fundamental and exploratory device technologies for spin

3:15 PM - 3:30 PM JST(6:15 AM - 6:30 AM UTC)English Presentation

[23p-A201-7] Impact of carbon on anomalous Hall conductivity in antiferromagnetic CoMn thin films for efficient current-induced magnetization switching

〇Shinji Isogami¹, Yohei Kota², Hideyuki Yasufuku¹, Keiji Oyoshi¹, Masahiko Tanaka¹, Yukiko Takahashi¹ (1.NIMS, 2.KOSEN Fukushima Col.)

Keywords:

transition metal carbides,Anomalous Hall effect,Current-induced magnetization switching

Carbon was embedded in the host 16-nm-thick CoMn antiferromagnetic films, via vacuum carburization process with Ar and C₂H₂ gas mixture under the annealing temperature of 500°C. Possible crystal structure revealed by x-ray diffraction suggests the L1₀-like structure with the carbon at body-centered site. It was revealed that the magnetic easy-axis lies on the film plane, and the magnitude of AHE enhanced drastically by carbon. Conversely, the film without carbon shows remarkably small value; therefore, carbon would be a booster of AHE. The enhanced saturation magnetization and negative AMR effects including fine crystal structures will be shown at the conference.