Abstract
In conventional heat-assisted magnetic recording media, the recording layer also acts as the storage layer. To minimize the effect of Tc variance, a new composite structure with a superparamagnetic writing layer is proposed to decouple the recording problem from the long-term storage issue. The thermal switching probability distribution (SPD) was calculated using 1nm × 1nm × 1nm renormalized parameters of FePt. Analytical derivation and micro-magnetic simulation results both show the volume dependence of the SPD Width ∞ 1/(Volume)1/2. The SPD of the composite structure designed in this paper has a full-width half-maximum of 44 K, which is 20% narrower than that found in an FePt recording layer subject to 3% Tc variance.
Original language | English (US) |
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Article number | 7389395 |
Journal | IEEE Transactions on Magnetics |
Volume | 52 |
Issue number | 7 |
DOIs | |
State | Published - Jul 2016 |
Bibliographical note
Publisher Copyright:© 1965-2012 IEEE.
Keywords
- Composite Media
- Heat Assisted Magnetic Recording
- Superparamagnetic Writing