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Magnetic viscosity, hysteresis reptation, and their relationship with adjacent track interference in advanced perpendicular recording media
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10.1063/1.4747941
/content/aip/journal/jap/112/4/10.1063/1.4747941
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/4/10.1063/1.4747941
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic description of the double exchange-break PMR media stack that comprises a gradation in anisotropy among the three magnetic layers. The samples consisted of a thickness series in the NiW seed, and the three magnetic layers.

Image of FIG. 2.
FIG. 2.

Saturation field, H s is plotted for the single exchange-break and double exchange-break PMR media vs. the total exchange-break layer thickness. H s is normalized to that for media with no exchange-break layers, H s(EBL = 0). The lines guide the eye.

Image of FIG. 3.
FIG. 3.

Error rate ATI degradation slope is plotted vs. thermal stability factor K u V/k B T for the four series of samples. The lines guide the eye.

Image of FIG. 4.
FIG. 4.

(a) Plot of the hysteresis loop for one of the samples in the study. The points for which the viscosity was measured are indicated by the solid circles (b) Set of viscosity curves for different external applied field values. The lines represent best-fit second-order logarithmic curves through the points. The initial magnetization for some of the viscosity curves is indicated in both (a) and (b).

Image of FIG. 5.
FIG. 5.

(a) The linear coefficient of viscosity, S 0 is plotted vs. the external applied field for the MAG3 series (b) S 0 is plotted vs. the initial magnetization, M i for the same series. The lines guide the eye.

Image of FIG. 6.
FIG. 6.

The linear coefficient of viscosity, S 0 is plotted vs. the initial magnetization, M i for (a) NiW series (b) MAG1 series (c) MAG2 series and (d) MAG3 series. The lines guide the eye.

Image of FIG. 7.
FIG. 7.

The quadratic coefficient of viscosity, S 1 is plotted vs. the initial magnetization, M i for (a) NiW series (b) MAG1 series (c) MAG2 series and (d) MAG3 series. The lines guide the eye.

Image of FIG. 8.
FIG. 8.

(a) The linear coefficient of viscosity, S 0 is plotted vs. the thermal stability factor K u V/k B T for the four series of samples (b) S 0 is plotted vs. the intrinsic coercive squareness, . The lines in both (a) and (b) are guides to the eye.

Image of FIG. 9.
FIG. 9.

(a) Plot of the hysteresis loop for one of the samples in the study. The set of curves in (b) and (c) illustrate the methodology for the reptation measurement (b) Set of field reptation curves, and (c) set of remanence reptation curves obtained after different external applied fields were applied and removed, respectively. The lines represent best-fit second-order logarithmic curves through the points.

Image of FIG. 10.
FIG. 10.

For one of the samples, the linear and quadratic coefficients of field reptation are plotted vs. the linear and quadratic coefficients of viscosity in (a) and (b), respectively. The same for remanence reptation are plotted in (c) and (d), respectively. The dotted lines are best-fits through the points.

Image of FIG. 11.
FIG. 11.

The linear coefficient of remanence reptation, R 0 is plotted vs. the initial remanence, for (a) NiW series, (b) MAG1 series, (c) MAG2 series, and (d) MAG3 series. The lines guide the eye.

Image of FIG. 12.
FIG. 12.

The quadratic coefficient of remanence reptation, R 1 is plotted vs. the initial remanence, for (a) NiW series, (b) MAG1 series, (c) MAG2 series, and (d) MAG3 series. The lines guide the eye.

Image of FIG. 13.
FIG. 13.

The normalized recording signal amplitude due to ATI is plotted vs. the number of adjacent write iterations for (a) NiW series, (b) MAG1 series, (c) MAG2 series, and (d) MAG3 series. The lines represent best-fit second-order logarithmic curves through the points. The initial signal after the first adjacent write is also indicated.

Image of FIG. 14.
FIG. 14.

The linear coefficient of remanence reptation, R 0 is plotted vs. the initial remanence, for values of the latter between 0.85 and 1.0 for (a) NiW series, (b) MAG1 series, (c) MAG2 series, and (d) MAG3 series. The solid squares correspond to those points for which values are equal to the initial signal values obtained from the signal amplitude ATI plots in Figure 13. The lines connecting the solid squares are guides to the eye.

Image of FIG. 15.
FIG. 15.

(a) Plot comparing the linear coefficient of signal amplitude ATI vs. that of remanence reptation for samples from all four series. The thermal stability factor K u V/k B T is indicated alongside for some of the samples (b) Plot comparing the quadratic coefficients of signal amplitude ATI and remanence reptation for all samples.

Image of FIG. 16.
FIG. 16.

(a) Plot comparing the linear coefficient of signal-to-noise ratio ATI vs. that of remanence reptation for samples from all four series. The thermal stability factor K u V/k B T is indicated alongside for some of the samples (b) Plot comparing the quadratic coefficients of signal amplitude ATI and remanence reptation for all samples.

Image of FIG. 17.
FIG. 17.

(a) Plot comparing the linear coefficient of error rate ATI vs. that of remanence reptation for samples from all four series. The thermal stability factor K u V/k B T is indicated alongside for some of the samples (b) Plot comparing the quadratic coefficients of error rate ATI and remanence reptation for all samples.

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/content/aip/journal/jap/112/4/10.1063/1.4747941
2012-08-28
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Magnetic viscosity, hysteresis reptation, and their relationship with adjacent track interference in advanced perpendicular recording media
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/4/10.1063/1.4747941
10.1063/1.4747941
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