Current-field diagram for the magnetic states of a surface spin valve in a point contact with a single ferromagnetic film

Yanson, I. K.; Balkashin, O. P.; Fisun, V. V.; Yanson, Yu. I.; Naidyuk, Yu. G.
March 2013
Low Temperature Physics;Mar2013, Vol. 39 Issue 3, p279
Academic Journal
This is a study of the influence of an external magnetic field H and an electric current I on the spin-valve (SV) effect in a point contact between a ferromagnetic thin film (F) and a sharp, nonmagnetic metal tip (N). To explain our observations, we propose a model for a local surface SV in an N/F contact of this type. In this model, a ferromagnetic cluster at the N/F interface serves as the free layer in the SV. This cluster has a larger coercive field than the bulk of the ferromagnetic film, presumably due to its nanoscale nature. Finally, we construct a magnetic state diagram of the surface SV as a function of I and H.


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