Abstract
A small uniaxial anisotropy is induced in Permalloy wires cold drawn to diameters of 1 mil and less. Knowledge of this induced anisotropy is important in the study of domain-wall behavior in such wires. The anisotropy field, HA, is typically less than 50 Oe with easy direction parallel to the wire axis. Static methods of measuring HA, as well as resonance methods under usual conditions, are hampered by the fact that the large shape anisotropy arising from the wire geometry tends to mask out the effects of HA. These short comings are overcome in the method discussed here by exciting ferromagnetic resonance with curl hrf obtained by driving rf current parallel to the wire axis. This method permits observation of resonance in the range from 2 to 3 Gc/sec at fields comparable with HA. The greater than 100-Oe linewidths observed are found to be dominated by a mechanism other than pure eddy-current exchange damping which would give rise to considerably smaller linewidths. The large variation in HA along the wire suggests that the linewidth is largely due to inhomogeneity in HA. The influence of eddy-current exchange effects on the determination of HA is evaluated.
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