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|Author(s):||William H. Rippard; Matthew R. Pufall; Thomas J. Silva;|
|Title:||Quantitative Studies of Spin-Momentum-Transfer-Induced Excitations in Co/Cu Multilayer Films Using Point-Contact Spectroscopy|
|Published:||February 24, 2003|
|Abstract:||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 Ic whose value linearly depends applied magnetic field B, in agreement with Slonczewski's theory. These features are observed for both in- and 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 Ic vs. Bapp and varied from contact-to-contact. These variations are within the range predicted by Slonczewski's theory, as bounded between the diffusive and ballistic limits for electron propagation through a point contact.|
|Citation:||Applied Physics Letters|
|Pages:||pp. 1260 - 1262|
|Keywords:||point contact,SMT,spin excitations,spin momentum transfer|
|PDF version:||Click here to retrieve PDF version of paper (110KB)|