[14a-A501-1~13] 10.2 Fundamental and exploratory device technologies for spin

▲ [14a-A501-9] Efficient spin current injection in Co₂MnSi/Pt films

〇(P)Yuta Sasaki¹, Satoshi Sugimoto¹, Yukiko Takahashi¹, Shinya Kasai^1,2 (1.NIMS, 2.JST PRESTO)

Keywords:Spin current, Heusler alloys

Spin pumping is one of the promising ways to generate the spin current in ferromagnetic (FM)/nonmagnetic (NM) heterostructures. A magnetization precessional motion under the ferromagnetic resonance (FMR) condition induces the spin current flow to the NM layer and it is converted into a transverse charge current via the inverse spin Hall effect(ISHE) in the NM layer. The key factor determining the spin transport property is the spin mixing conductance at the FM/NM surface. The spin injection efficiency depends on the choice of the materials, however, there are few reports on its FM material dependence. In this study, the spin injection efficiency in Co₂MnSi(CMS), which shows a large spin polarization and large magnetoresistance, was systematically investigated using the spin pumping method.