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Size-dependent reversal of grains in perpendicular magnetic recording media measured by small-angle polarized neutron scattering
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10.1063/1.3486680
/content/aip/journal/apl/97/11/10.1063/1.3486680
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/11/10.1063/1.3486680
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Figures

Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

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 .

Image of FIG. 3.
FIG. 3.

(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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/content/aip/journal/apl/97/11/10.1063/1.3486680
2010-09-13
2014-04-16
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Size-dependent reversal of grains in perpendicular magnetic recording media measured by small-angle polarized neutron scattering
http://aip.metastore.ingenta.com/content/aip/journal/apl/97/11/10.1063/1.3486680
10.1063/1.3486680
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