Thermal switching probability distribution of L10 FePt for heat assisted magnetic recording

Transition jitter is one of the most important parameters for evaluating the potential areal density of Heat Assisted Magnetic Recording. However, obtaining this either experimentally or through micro-magnetic simulation is time consuming. Here, we show that the more easily calculated thermal switch...

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Bibliographic Details
Published inApplied physics letters Vol. 110; no. 18
Main Authors Liu, Zengyuan, Huang, Pin-Wei, Ju, Ganping, Victora, R. H.
Format Journal Article
LanguageEnglish
Published Melville American Institute of Physics 01.05.2017
Subjects
Applied physics
Grain size
Grain size distribution
Magnetic recording
Magnetic tape
Particle size distribution
Probability distribution
Switching
Tracking
Variance
Vibration
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Summary:Transition jitter is one of the most important parameters for evaluating the potential areal density of Heat Assisted Magnetic Recording. However, obtaining this either experimentally or through micro-magnetic simulation is time consuming. Here, we show that the more easily calculated thermal switching probability distribution (SPD) can serve as a substitute. In particular, we provide an equation relating the standard deviation of write temperature to the jitter. The equation is verified for three critical noise sources: T c variance, H K variance, and grain size distribution. In addition, the SPD subject to cooling at various cross-track positions is investigated. A method to determine the magnetic grain size is proposed.
Bibliography:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4983033