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Magnetic design evolution in perpendicular magnetic recording media as revealed by resonant small angle x-ray scattering
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10.1063/1.4820921
/content/aip/journal/apl/103/11/10.1063/1.4820921
http://aip.metastore.ingenta.com/content/aip/journal/apl/103/11/10.1063/1.4820921

Figures

Image of FIG. 1.
FIG. 1.

(a) Experimental setup with CCD distances at 80, 255, and 430 mm from the sample. At the nearest distance, the CCD is off set to the upper left from the incoming beam in order to access the higher angles. (b) A comparison of resonant and non-resonant scattering showing the charge scattering ring corresponding to structural grains and the magnetic scattering ring corresponding to magnetic clusters. There is no magnetic scattering visible off resonance. The color bar represents the scattering intensity in logarithmic scale.

Image of FIG. 2.
FIG. 2.

(a) SAXS profiles for the GRL layer of 4 different generations of PMR recording media from 2007–2012 (Gen1–Gen4). (b) Corresponding profiles from the full media structures (GRL + MCL). SAXS features from the structural grains are visible at periods of around 8–10 nm, while SAXS features representing magnetic correlations, i.e., magnetic clusters are visible at periods of 20–100 nm. The intensities are shifted for better comparison. (c) A simplified magnetic media layer structure with SUL, seed and Ru underlayers, GRL, MCL, and carbon overcoat (COC). (d) Plan-view TEM image of the grain structure in the GRL from a recent Gen4 media design.

Image of FIG. 3.
FIG. 3.

(a) Average media grain sizes and cluster sizes as evolved over time from Gen1 to Gen4 for “GRL only” and full media stack (GRL + MCL). (b) Media grain size and cluster size distributions as evolved over time from Gen1 to Gen4 for “GRL only” and full media stack (GRL + MCL). (c) Illustration of simplified media layers and lateral microstructure as evolved over time from Gen1 to Gen4. From Gen1 through Gen3, the grain boundary phase in the GRL became more effective in magnetically decoupling the grains from each other. Moving to Gen4 media the only way to reduce lateral exchange further in the composite system is via the MCL.

Tables

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Table I.

Grain sizes/magnetic cluster sizes and grain size distributions/magnetic cluster size distributions as extracted from the SAXS data of Fig.  2 .

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/content/aip/journal/apl/103/11/10.1063/1.4820921
2013-09-10
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetic design evolution in perpendicular magnetic recording media as revealed by resonant small angle x-ray scattering
http://aip.metastore.ingenta.com/content/aip/journal/apl/103/11/10.1063/1.4820921
10.1063/1.4820921
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