Electrical spin injection and detection have been investigated at cryogenic temperatures using a lateral spin-valve structure. Either Bi or BiPb was used as a nonmagnetic spin medium, while CoFe and NiFe were employed as the spin injector and spin detector, respectively. A large magnetoresistance signal corresponding to ΔR=1.2 m was detected from the BiPb-based spin-valves. From this result, a large spin diffusion length of 230 μm and a high interfacial spin polarization of 10% were derived. From an independent calculation, it was found that the interfacial spin polarization and the associated spin accumulation are strongly correlated with the interfacial resistance.
Bibliographical noteFunding Information:
This work was supported by Priority Research Centers Program (Grant No. 2009-0093823) through the National Research Foundation of Korea (NRF), by a grant from the Fundamental R&D Program for Core Technology of Materials funded by the Ministry of Knowledge Economy, and by the Basic Science Research Program (Grant No. NRF-2007-314-C00107) through the National Research Foundation of Korea (NRF).
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)