Method of designing patterned magnetic recording medium and...

Details Method of designing patterned magnetic recording medium and... Method of designing patterned magnetic recording medium and...

2008-03-04

2008-03-04

Heinz, A. J. (Department: 2627)

Dynamic magnetic information storage or retrieval

Record medium

C360S135000

Reexamination Certificate

active

11689851

ABSTRACT:
A method of designing a patterned magnetic recording medium including a magnetic film with perpendicular magnetic anisotropy which is patterned into dots form includes steps of setting values to dot pattern periods Pxand Py, a thickness “t”, a thermal stability factor Kn, a minimum inter-dot spacing S0, and a maximum recording field Hm, setting an initial value of a saturation magnetization Ms, finding a nucleation field for magnetization reversal Hnand estimating a coercivity Hcand a saturation field Hs, and repeating the steps given above so as to make the saturation field Hslower than the maximum recording field Hm, thereby determining the magnetic properties Ms, Hnand Hcsatisfying a desired condition.

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Charles T. Rettner, et al., “Patterning of Granular Magnetic Media with a Focused Ion Beam to Produce Single-Domain Islands at >140 Gbit/in2”, IEEE Transactions on Magnetics, vol. 37, No. 4, Jul. 2001, pp. 1649-1651.

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