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High frequency effects in perpendicular recording media (2000)

Greaves, S. J. ; Muraoka, H. ; Sugita, Y. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 87 (2000), S. 4990-4992

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: Simulations of perpendicular recording media were carried out to determine the effect of switching speed limitations upon recording performance. Simulations of hysteresis loops at various applied field sweep rates show that the onset of a switching speed limited increase in coercivity occurs for sweep rates in excess of 2×1013 Oe/s. Switching speeds of individual grains were found to be around 18 to 38 ps, depending on the medium thickness and the magnetization state of surrounding grains. Recording simulations show that for media thicknesses of up to 180 Å, writing frequencies of 5 Gbit/s are feasible before loss of output occurs. © 2000 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.373225

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Interaction effects and magnetic ordering in GMR alloys : The 6th joint magnetism and magnetic materials (MMM)−intermag conferenc (1994)

Greaves, S. J. ; El-Hilo, M. ; O'Grady, K. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 76 (1994), S. 6802-6804

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: In this paper AgNiFe alloy films were examined both before and after annealing. Characterization of the samples and examination of interaction effects was carried out by measuring the temperature decay of remanence, initial susceptibility, and magnetoresistance. The temperature decay of remanence reveals that annealing widens the distribution of energy barriers, which is indicative of grain growth. The behavior of the initial susceptibility as a function of temperature is analogous to that found in spin glasses. From these measurements, it is believed that interaction effects in these systems are small.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.358472

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Reversal mechanisms in Tb/Fe multilayers : 38th Annual Conference on Magnetism and Magnetic Materials (1994)

O'Grady, K. ; Thomson, T. ; Greaves, S. J. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 75 (1994), S. 6849-6851

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: Reversal processes in Tb/Fe multilayer films are reported. The form of the hysteresis is explained as a function of the number of bilayers in terms of a two-coercivity model. Remanence measurements have been made which provide an insight into the distribution of the energy barriers for the two coercive processes associated with nucleation or domain-wall motion. The time dependence of magnetization has also been measured and this has been used to evaluate fluctuation fields and activation volumes for the series of films. The variation of the fluctuation field with applied field indicates that the two-coercivity model proposed is consistent with the time dependence. An increase is seen in the average activation volume with the number of bilayers.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.356805

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