Quantitative studies of spin-momentum-transfer-induced excitations in Co/Cu multilayer films using point-contact spectroscopy

Rippard, W. H.; Pufall, M. R.; Silva, T. J.
February 2003
Applied Physics Letters;2/24/2003, Vol. 82 Issue 8, p1260
Academic Journal
We have measured current-induced magnetic excitations in a variety of exchange-coupled Co/Cu multilayers using point-contact spectroscopy. A step in the dc resistance and corresponding peak in dV/dI are observed at a critical current I[SUBc] (whose value depends linearly on applied magnetic field B[SUBapp], in agreement with Slonczewski's theory. These features are observed for both in- and 8 out-of-plane fields. Excitations in ferromagnetically coupled films occur even without an applied field. The spin transfer efficiency is determined from the slope and intercept of I[SUBc] (vs) B[SUBapp] and varied from contact to contact. For out of plane magnetized samples, the deduced spin transfer efficiency values are in good agreement with the predictions of Slonczewski.


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