Improving the signal-to-noise ratio for heat-assisted magnetic recording by optimizing a high/low Tc bilayer structure

Autor(en)

Olivia Muthsam, Florian Slanovc, Christoph Vogler, Dieter Süss

Abstrakt

We optimize the recording medium for heat-assisted magnetic recording by using a high/low T c 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 = 5 nm and height h = 8 nm. 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 α SM = 0.1 and J i j, SM = 7.72 × 10 - 21 J / 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 1 Tb / in. 2 higher than that of the pure hard magnetic material while obtaining the same signal-to-noise ratio.

Organisation(en)

Physik Funktioneller Materialien

Journal

Journal of Applied Physics

Band

126

Anzahl der Seiten

7

ISSN

0021-8979

DOI

https://doi.org/10.1063/1.5119407

Publikationsdatum

2019

Peer-reviewed

Ja

ÖFOS 2012

103017 Magnetismus

Schlagwörter

ASJC Scopus Sachgebiete

Allgemeine Physik und Astronomie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/ddd0b64c-d3d1-4b88-85fb-c6344b11f277