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Materials Development for Thermally-Assisted Magnetic Recording Media

Published online by Cambridge University Press:  21 March 2011

C.F. Brucker  and
T.W. McDaniel
C.F. Brucker
Affiliation:
Seagate Technology, 47050 Kato Road Fremont, CA 94538, U.S.A.
T.W. McDaniel
Affiliation:
Seagate Technology, 47050 Kato Road Fremont, CA 94538, U.S.A.
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Abstract

We have carried out a combined experimental and computer simulation study to specify and identify candidate films to support high areal density, thermally-assisted magnetic recording. The motivation of this work is to utilize the enhanced writability of very high coercivity materials that thermal assistance can provide. Media with high coercivity (and anisotropy Ku) are known to be essential to achieve a sufficiently high ratio of KuV/kBT necessary to maintain magnetic stability at temperature T in media switching units (grains; single domains) of volume V. Nominally, we expect V ∝ D−3/2, where D is the medium bit density per unit area in recording. A micromagnetic recording simulation tool with a capability of representing realistic grain size distributions, temperature-dependent magnetic properties, and spatially-varying imposed temperature distributions was employed to study the interplay of thermal and magnetic field gradients in the recording process. In addition, a simple LLG-based thermomagnetic switching model supplemented the micromagnetics model. We fabricated improved Co/X multilayer media for recording evaluation, and performed standard materials characterization.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 674: Symposia T/U/V – Applications of Ferromagnetic and Optical Materials, Storage and Magnetoelectronics , 2001 , V2.3
Copyright
Copyright © Materials Research Society 2001

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References

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