The superior role of the Gilbert damping on the signal-to-noise ratio in heat-assisted magnetic recording
- Author(s)
- O. Muthsam, F. Slanovc, C. Vogler, D. Suess
- Abstract
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.
- Organisation(s)
- Physics of Functional Materials
- Journal
- Journal of Magnetism and Magnetic Materials
- Volume
- 514
- No. of pages
- 6
- ISSN
- 0304-8853
- DOI
- https://doi.org/10.1016/j.jmmm.2020.167125
- Publication date
- 11-2020
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103017 Magnetism, 103015 Condensed matter, 103018 Materials physics
- ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials, Condensed Matter Physics
- Portal url
- https://ucris.univie.ac.at/portal/en/publications/the-superior-role-of-the-gilbert-damping-on-the-signaltonoise-ratio-in-heatassisted-magnetic-recording(9518f3ce-900e-45a9-acc7-2b6b0d5b544a).html