The superior role of the Gilbert damping on the signal-to-noise ratio in heat-assisted magnetic recording

•Important to understand influence of recording parameters on signal-to-noise ratio.•Damping constant has strong influence on signal-to-noise ratio.•Signal-to-noise ratio saturates for larger damping constants. In magnetic recording the signal-to-noise ratio (SNR) is a good indicator for the quality...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2020-11, Vol.514, p.167125, Article 167125
Main Authors: Muthsam, O., Slanovc, F., Vogler, C., Suess, D.
Format: Article
Language:English
Subjects:
Codes
Damping
Grain size
Magnetic materials
Magnetic recording
Parameters
Signal to noise ratio
Simulation
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Summary:•Important to understand influence of recording parameters on signal-to-noise ratio.•Damping constant has strong influence on signal-to-noise ratio.•Signal-to-noise ratio saturates for larger damping constants. In magnetic recording the signal-to-noise ratio (SNR) is a good indicator for the quality of written bits. However, a priori it is not clear which parameters have the strongest influence on the SNR. In this work, we investigate the role of the Gilbert damping on the SNR. Grains consisting of FePt like hard magnetic material with two different grain sizes d=5 nm and d=7 nm are considered and simulations of heat-assisted magnetic recording (HAMR) are performed with the atomistic simulation program VAMPIRE. The simulations display that the SNR saturates for damping constants larger or equal than 0.1. Additionally, we can show that the Gilbert damping together with the bit length have a major effect on the SNR whereas other write head and material parameters only have a minor relevance on the SNR.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2020.167125