Stacked structure of a typical coupled granular continuous (CGC) medium. Inter granular and inter layer coupling are shown by springs in the figure.
(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.
(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.
Average initial boundary height (t BH) and range of initial boundary height (Δt BH) for stacked media with various materials of granular layer.
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.
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.
(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.
Energy dependence on angle between magnetization and easy axis.
ΔE dependence on J Col.
Model structure used in the numerical calculation to find J CL dependence on cap layer thickness.
Average and fluctuation calculation of inter granular coupling for model in Figures 7(a) and 7(b).
Model of a stacked medium with a small ferromagnetic exchange coupling spacer layer between the granular layer and cap layer.
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.
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.
Interlayer F-coupling constant (J F) dependence on spacer layer thickness at various Rh thicknesses.
Model of a stacked medium with Pd spacer layer.
J CL and J Col dependence on spacer layer thickness.
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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