[10p-PB3-1~43] 10 Spintronics and Magnetics (Poster)

[10p-PB3-23] Fabrication and TMR effect of MTJs using Co₂FeAl_0.13Si_0.87 Heuler alloy

〇Hiu Kuwano¹, Takayuki Hojo¹, Takahide Kubota¹, Mikihiko Oogane¹, Masakiyo Tsunoda¹ (1.Tohoku Univ.)

Keywords:

spintronics,magnetic tunnel junction,Co-based Heusler alloys

Co-based Heusler alloys are expected to exhibit large tunnel magnetoresistance (TMR) effects owing to their high spin polarization. In particular, Co₂FeAl_xSi_1-xis promising for biomagnetic sensor applications using magnetic tunnel junctions (MTJs), because the magnetocrystalline anisotropy constant K₁ can be reduced to nearly zero by controlling the Al/Si composition ratio. In this presentation, we report the magnetocrystalline anisotropy K₁and TMR properties of Co₂FeAl_0.13Si_0.87 single-layer films and MTJs, whose composition is close to K₁ ~ 0.