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Magnetically and thermally induced switching processes in hard magnets
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Image of FIG. 1.
FIG. 1.

(a) -XRD scan. The reflex positions expected for bulk ordered FePt and the MgO substrate are marked by lines. The inset shows a rocking curve of the (001) reflex. (b) AFM image of the 5 nm FePt film.

Image of FIG. 2.
FIG. 2.

Hysteresis loops measured at different angles between easy axis and applied field. For exemplary coercivity and switching field are marked. Additionally for the initial curve is plotted.

Image of FIG. 3.
FIG. 3.

Coercivity and switching field with respect to the tilting angle between substrate normal and applied field. The red curve illustrates the expected SW-dependence for the measured anisotropy field of 10.8 T. The black line is a fit of Eq. (1) with as free parameter. The solid lines consider the texture spread of the magnetic easy axes, the dotted lines not. The blue line shows the expected trend of the coercivity. Up to , it does not differ from . For ) should result from a mirror operation of the switching field at the line .

Image of FIG. 4.
FIG. 4.

Out-of-plane viscosity measurements. The time dependency of the magnetic moment is plotted semi-logarithmic for different reverse fields .

Image of FIG. 5.
FIG. 5.

Linear fit for determining the thermal stability factor and the zero-field via Eq. (7).

Image of FIG. 6.
FIG. 6.

Viscosity coefficient S and calculated fluctuation field for different reversed fields.


Generic image for table
Table I.

Overview of the results, which are obtained by analysing dynamic coercivity and viscosity coefficient.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetically and thermally induced switching processes in hard magnets