[14p-P10-1~98] 10 Spintronics and Magnetics（Poster）

[14p-P10-55] Manipulation of in-plane magnetic anisotropy in amorphous CoFeB films induced by structural phase transitions of BaTiO₃

〇Shinji Isogami¹, Tomoyasu Taniyama² (1.Fukushima NCT., 2.Tokyo Institute of Tech.)

Keywords:Multiferroic, Magnetostrictive effect, Magnetic anisotropy

Magnetic anisotropy in the amorphous CoFeB films deposited on the BaTiO₃ substrates were investigated, and the value of uniaxial magnetic anisotropy energy demonstrated the drastic change from 0.36×10⁵ erg/cm³ to 7.4×10⁵ erg/cm³, which can be attributed to the structural transition from the tetragonal to the orthorhombic phases of the BaTiO₃. Because the order of the values agreed with those estimated from the lattice strain occurring in the BaTiO₃ substrate, the induced magnetic anisotropy was originated from the magnetostrictive effect. The effect of Ta layer insertion at the BaTiO₃ substrate/CoFeB interface as well as the domain structure in the BaTiO₃ will be discussed at the conference.