Titel
Improving the signal-to-noise ratio for heat-assisted magnetic recording by optimizing a high/low Tc bilayer structure
Autor*in
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Abstract
We optimize the recording medium for heat-assisted magnetic recording by using a high/low Tc bilayer structure to reduce AC and DC noise. Compared to a former work, small Gilbert damping α=0.02 is considered for the FePt-like hard magnetic material. Atomistic simulations are performed for a cylindrical recording grain with diameter d=5nm and height h=8nm. Different soft magnetic material compositions are tested, and the amount of hard and soft magnetic material is optimized. The results show that for a soft magnetic material with αSM=0.1 and Jij,SM=7.72×10−21J/link, a composition with 50% hard and 50% soft magnetic material leads to the best results. Additionally, we analyze how much areal density can be improved by using the optimized bilayer structure compared to the pure hard magnetic recording material. It turns out that the optimized bilayer design allows an areal density that is 1Tb/in.2 higher than that of the pure hard magnetic material while obtaining the same signal-to-noise ratio.
Stichwort
Atomistic simulationsMagnetic devicesMagnetization dynamicsMagnetic materialsMagnetic anisotropyExchange interactions
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
phaidra.univie.ac.at/o:1085596
Erschienen in
Titel
Journal of Applied Physics
Band
126
Ausgabe
12
ISSN
0021-8979
Erscheinungsdatum
2019
Publication
AIP Publishing
Fördergeber
— I2214-N20
Erscheinungsdatum
27.09.2019
Zugänglichkeit
Rechte
Rechteangabe
© Author(s) 2019
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