Spin-stand Measurements to Extract the Switching Distributions of Heat-Assisted Magnetic-Recording Media

A new measurement method to characterize the switching temperature distributions of heat-assisted magnetic recording (HAMR) media at recording time scales is presented. The method uses HAMR components in conventional recording systems, such as spin-stand testers and hard disk drives. Using DC noise...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2023-03, Vol.59 (3), p.1-1
Main Authors: Jubert, Pierre-Olivier, Tang, Toan, Gee, Harold, NGUYEN, Thien, Wolf, Daniel, Rivkin, Kirill, Bashir, Asif, Moser, Andreas, Roddick, Eric, Papusoi, Cristian
Format: Article
Language:English
Subjects:
Current measurement
Disk drives
Heat Assisted Magnetic Recording (HAMR)
Heat-assisted magnetic recording
Laser noise
magnetic media
Magnetic recording
Magnetic storage
Magnetism
measurement
Measurement by laser beam
Measurement methods
Media
Recording instruments
Switching
Temperature distribution
Temperature measurement
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Summary:A new measurement method to characterize the switching temperature distributions of heat-assisted magnetic recording (HAMR) media at recording time scales is presented. The method uses HAMR components in conventional recording systems, such as spin-stand testers and hard disk drives. Using DC noise measurements, a 2-dimensional map of the probability of grains switching is extracted as a function of the medium temperature and of the applied field, which are controlled by the HAMR head laser power and writer current, respectively. These measurements give access to details of the HAMR media temperature and field distributions, as well as provide useful information related to the operation of the HAMR recording system.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2022.3214085