Current-induced domain-wall motion in synthetic antiferromagnets
Abstract
Domain-wall magnetoresistance and low-frequency noise have been studied in epitaxial antiferromagnetically-coupled [Fe/Cr(001)]10 multilayers and ferromagnetic Co line structures as a function of DC current intensity. In [Fe/Cr(001)]10 multilayers a transition from excess to suppressed domain-wall induced 1/f noise above current densities of jc ~ 2*105 A/cm2 has been observed. In ferromagnetic Co line structures the domain wall related noise remains qualitatively unchanged up to current densities exceeding 106A/cm2. Theoretical estimates of the critical current density for a synthetic Fe/Cr antiferromagnet suggest that this effect may be attributed to current-induced domain-wall motion that occurs via spin transfer torques.
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