Basic noise mechanisms of heat-assisted-magnetic recording

TL;DR

This paper presents an analytical model for understanding and mitigating heat-induced noise in heat-assisted magnetic recording, aiming to enhance data density in magnetic storage devices.

Contribution

It introduces a simple yet effective model based on the effective recording time window to analyze fundamental noise mechanisms in HAMR.

Findings

The model explains AC and DC noise origins in HAMR.

Strategies to reduce noise and improve storage density are discussed.

Insights gained can guide the design of more reliable HAMR systems.

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.