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Micromagnetic analysis of the effect of intergranular exchange on thermal stability in magnetic recording. II. Slightly oriented longitudinal media

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2 Author(s)
Hong Zhou ; Center for Magnetic Recording Res., California Univ., San Diego, La Jolla, CA, USA ; H. N. Bertram

For pt.I see ibid., vol.38, no.2, p.1405-16 (Mar. 2002). We describe micromagnetic simulations to examine the effect of intergranular exchange on thermal stability of dibit transitions in slightly oriented longitudinal media. We found that, by increasing the intergranular exchange and the anisotropy orientation ratio, Ku⟨V⟩ is reduced to maintain the fixed Mrt, the writing coercivity, and the average grain planar area. Within the drive working temperatures (T⩽350 K), to increase signal-to-noise ratio (SNR) at 109 s, both the intergranular exchange and the anisotropy orientation ratio must be reduced. However, if both Ku ⟨V⟩ and Mrt are fixed, for a constant circumferential loop closure field, a larger SNR is always exhibited at a higher OR(Mr) initially and at 109 s. For both cases, if the intergranular exchange cannot be neglected, SNR always slightly increases with increasing OR(Mr)

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IEEE Transactions on Magnetics  (Volume:38 ,  Issue: 2 )