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Effect of inhomogeneous microstructure of granular layer on inter granular/inter layer exchange coupling in stacked perpendicular recording media
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10.1063/1.4764312
/content/aip/journal/jap/112/9/10.1063/1.4764312
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/9/10.1063/1.4764312
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Stacked structure of a typical coupled granular continuous (CGC) medium. Inter granular and inter layer coupling are shown by springs in the figure.

Image of FIG. 2.
FIG. 2.

(a) Average boundary width (d BW) and range of boundary width (Δd BW) dependence on SiO2 content of CoCrPt-SiO2 granular layer. (b) Average grain diameter and standard deviation of grain diameter dependence on SiO2 content of CoCrPt-SiO2 granular layer.

Image of FIG. 3.
FIG. 3.

(a) Cross-section TEM image of the stacked medium. (b) Plane-view TEM image of the cap layer. (c) Plane-view TEM image of the granular layer. (d) Cross-section model image for the stacked medium.

Image of FIG. 4.
FIG. 4.

Average initial boundary height (t BH) and range of initial boundary height (Δt BH) for stacked media with various materials of granular layer.

Image of FIG. 5.
FIG. 5.

The relation between (a) average boundary width (d BW) and average of initial boundary height (t BH), (b) range of boundary width (Δd BW), and range of initial boundary height (Δt BH), (c) cross-section model image of the stacked medium.

Image of FIG. 6.
FIG. 6.

Magnetic domains observed by MFM for media with various cap layer thicknesses, (a) 0, (b) 1.7, (c) 3.4, (d) 5.1, and (e) 6.8 nm.

Image of FIG. 7.
FIG. 7.

(a) Model of center grains surrounded with 6 grains for stacked medium with granular layer and cap layer. (b) Stacked medium with single layer model which is equivalent to model in Fig. 7(a). The center grain is also surrounded with 6 grains. In this image the front 2 grains and the behind 2 grains were taken out to focus on the center.

Image of FIG. 8.
FIG. 8.

Energy dependence on angle between magnetization and easy axis.

Image of FIG. 9.
FIG. 9.

ΔE dependence on J Col.

Image of FIG. 10.
FIG. 10.

Model structure used in the numerical calculation to find J CL dependence on cap layer thickness.

Image of FIG. 11.
FIG. 11.

Average and fluctuation calculation of inter granular coupling for model in Figures 7(a) and 7(b).

Image of FIG. 12.
FIG. 12.

Model of a stacked medium with a small ferromagnetic exchange coupling spacer layer between the granular layer and cap layer.

Image of FIG. 13.
FIG. 13.

Schematic M-H loop for stacked media, (a) without reference layer, (b) with reference layer when ferromagnetic coupling (F-coupling) is larger than anti ferromagnetic coupling (AF-coupling), (c) with reference layer when F-coupling is smaller than AF-coupling.

Image of FIG. 14.
FIG. 14.

Interlayer F-coupling constant (J F) and interlayer AF-coupling constant (J AF) dependence on spacer layer thickness at Rh thickness of around 0.9 nm.

Image of FIG. 15.
FIG. 15.

Interlayer F-coupling constant (J F) dependence on spacer layer thickness at various Rh thicknesses.

Image of FIG. 16.
FIG. 16.

Model of a stacked medium with Pd spacer layer.

Image of FIG. 17.
FIG. 17.

J CL and J Col dependence on spacer layer thickness.

Image of FIG. 18.
FIG. 18.

J CL, ΔJ Col and ΔJ CL, ΔJ Col dependence on cap layer thickness at spacer layer thickness of around 1.1 nm.

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/content/aip/journal/jap/112/9/10.1063/1.4764312
2012-11-08
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effect of inhomogeneous microstructure of granular layer on inter granular/inter layer exchange coupling in stacked perpendicular recording media
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/9/10.1063/1.4764312
10.1063/1.4764312
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