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The radial average of the isotropic nuclear-magnetic cross-term as a function of applied magnetic field. The negative contributions to that grow with increasing reverse field come from grains that have reversed their magnetization. The solid curves are derived from our scattering model in which grains of different size are permitted to switch.
The color plots of indicate the characteristic time at which, following application of a reversal field , a grain of diameter will have reversed its magnetization direction. For a constant measurement time values of the critical grain size should thus follow the contours of constant time. (a) Measured compared to a simple Sharrock model, showing poor agreement. (b) Measured compared to a modified model in which the anisotropy field has a monotonic dependence on grain size .
(a) The in-plane magnetization curve measured using a VSM (triangles) compared to the simulation (solid line). The parameters used are those derived from neutron scattering experiments without adjustment. is scaled to the measured saturation moment in the curve. (b) The fitted anisotropy field obtained from neutron data has an approximately linear dependence on grain size .
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