Basic noise mechanisms of heat-assisted-magnetic recording

Abstract

Heat-assisted magnetic recording (HAMR) is expected to be a key technology to significantly increase the areal storage density of magnetic recording devices. At high temperatures thermally induced noise becomes a major problem, which must be overcome in order to reliably write magnetic bits with narrow transitions. We propose an elementary model based on the effective recording time window (ERTW) to compute the switching probability of bits during HARM of bit-patterned media. With few assumptions this analytical model allows to gain deeper insights into the basic noise mechanisms like AC and DC noise. Finally, we discuss strategies to reduce noise and to increase the areal storage density of both bit-patterned as well as granular media.

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• Improving the Signal-to-noise Ratio for Heat-Assisted Magnetic Recording by Optimizing a High/Low Tc bilayer structure
• The superior role of the Gilbert damping on the signal-to-noise ratio in heat-assisted magnetic recording
• Write head design for effective curvature reduction in heat-assisted magnetic recording by topology optimization
• Graphene Overcoats for Ultra-High Storage Density Magnetic Media