Journal
JOURNAL OF APPLIED PHYSICS
Volume 122, Issue 21, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5004244
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Funding
- Vienna Science and Technology Fund (WWTF) [MA14-044]
- Advanced Storage Technology Consortium (ASTC)
- Austrian Science Fund (FWF) [I2214-N20]
- Austrian Science Fund (FWF) [I2214] Funding Source: Austrian Science Fund (FWF)
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It is assumed that heat-assisted magnetic recording is the recording technique of the future. For pure hard magnetic grains in high density media with an average diameter of 5 nm and a height of 10 nm, the switching probability is not sufficiently high for the use in bit-patterned media. Using a bilayer structure with 50% hard magnetic material with low Curie temperature and 50% soft magnetic material with high Curie temperature to obtain more than 99.2% switching probability leads to very large jitter. We propose an optimized material composition to reach a switching probability of Pswitch > 99.2% and simultaneously achieve the narrow transition jitter of pure hard magnetic material. Simulations with a continuous laser spot were performed with the atomistic simulation program VAMPIRE for a single cylindrical recording grain with a diameter of 5 nm and a height of 10 nm. Different configurations of soft magnetic material and different amounts of hard and soft magnetic material were tested and discussed. Within our analysis, a composition with 20% soft magnetic and 80% hard magnetic material reaches the best results with a switching probability Pswitch > 99.2%, an off-track jitter parameter sigma(off), (80/20) = 0.46 nm and a down-track jitter parameter sigma(down),(80/20) = 0.49 nm. Published by AIP Publishing.
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