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Thermal limits on field alignment of nanoparticle FePt media
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Definition of , the angle between the particle magnetization and the applied field . (b) The definition of , the median angle in the particle distribution function.

Image of FIG. 2.
FIG. 2.

A plot of vs , the normalized maximum magnetostatic energy of the particle in the applied field (solid line). Also shown (dashed line) is an estimate of from the average of calculated from the Langevin function (Ref. 16). This is a good approximation at lower values of .

Image of FIG. 3.
FIG. 3.

Values of vs particle diameter for several values of applied field (solid lines). Also shown is one case at cryogenic temperatures (dashed line). The particles are assumed to be spherical with an of .

Image of FIG. 4.
FIG. 4.

The required alignment field to reach as a function of particle diameters (same assumptions as in Fig. 3). The effect of demagnetizing field on the required alignment field are captured by the solid line labeled , which was the assumed value of the demagnetizing factors for a 2D array of particles aligned normal to the array plane.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Thermal limits on field alignment of nanoparticle FePt media