Schematic of a point contact between a Ag tip and a Co film deposited on top of a Cu bottom electrode. The magnetic field is applied in the plane of the film.
, , and vs for a point contact with in zero field (dashed, red). In field (black solid line) a step in is observed as well as peaks in and at .
spectra for two point contacts of approximately equal resistance. The ballistic contact (dashed line, ) has pronounced phonon peaks (at , ) and no magnetic peaks. Weak phonon peaks and pronounced magnetic features are observed for the diffusive contact (solid line, ).
Hysteretic current-driven switching for point contact. The magnetic field is applied in the plane of the film.
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