9:00 AM - 9:15 AM
▼ [12a-S302-1] Large impact of spin-scattering asymmetry at Co2Fe0.4Mn0.6Si/CoFe ferromagnetic interface on current-perpendicular-to-plane giant magnetoresistance
Keywords:spintronics, giant magnetoresistance, Heusler alloy
In this study, we show direct evidence for interface spin-scattering asymmetry (γ) at half metallic ferromagnet/ferromagnet interface based on a half metallic Co2Fe0.4Mn0.6Si (CFMS)/CoFe interface. Fully epitaxial current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) pseudo spin-valve (PSV) devices involving CoFe/CFMS/Ag/CFMS/CoFe structures exhibit an enhancement in resistance change-area product owing to the formation of the CFMS/CoFe interface at room temperature. This is well reproduced qualitatively by a simulation based on the generalized two-current series-resistor model with considering the presence of large γ at the CFMS/CoFe interface in the CPP-GMR PSV structure. We also discuss the results of the first-principles ballistic transport calculations for (001)-CoFe/CFMS/CoFe, which indicate strong spin-dependent conductance at the CFMS/CoFe interface, suggesting large γ.