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Micromagnetic analysis of the effect of intergranular exchange on thermal stability in magnetic recording. I. Two-dimensional isotropic longitudinal media

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

We describe micromagnetic simulations that examine the effect of intergranular exchange on thermal stability of dibit transitions in two-dimensional (2D) isotropic longitudinal media. We found that, by maintaining the constant Mrt, the writing coercivity and the average grain planar area, Ku ⟨V⟩ is reduced with increasing he. Increasing the intergranular exchange enhances thermal decay and yields a smaller signal-to-noise ratio (SNR) at 109 s. However, if both Ku⟨V⟩ and Mrt are fixed, ⟨D⟩ increases slightly if the writing coercivity is held constant but decreases slightly at a fixed intrinsic loop closure field. For both cases, a smaller SNR is always found at a higher exchange initially and after ten years. Thus, for 2D isotropic longitudinal media, the intergranular exchange must be reduced to achieve a higher SNR at 109 s

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