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