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We describe variations in the resistance of Co/Cu multilayers, induced by means of a high current density ≈10⁸A/cm² injected into the multilayer through a point contact. We propose that the observed resistance changes are due to excitations of zero-wave-number spin waves in the magnetic layers. As predicted, such current-driven excitation of a magnetic multilayer occurs for only one direction of current flow and has a current threshold which increases linearly with the applied magnetic field.
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Tsoi et al. (1998) studied this question.
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