科研之友
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摘要
A nonlocal spin valve (NLSV) is a nanoscale planar heterostructure, consisting of a spin injector, a spin detector, and a nonmagnetic channel. A pure spin current can be induced in the nonmagnetic channel by electrical spin injection. We report large but inverted spin signals in a set of NLSV structures. The interface between the ferromagnetic spin detector and the nonmagnetic channel is found to be a break junction formed by electrostatic discharge. A large (> 80%) but negative tunneling spin polarization across the break junction is inferred. The large magnitude is due to a strong coupling between the charges and spins at the low-conductance break junction. The inverted sign results from the specific interfacial atomic structures and bonding states, which influence the spin-dependent tunneling matrices.
- 出版日期2011-3-3
