Effect of Recording Conditions on the Downtrack Thermal Gradient in Heat-Assisted Magnetic Recording

Downtrack thermal gradient (DTG) is calculated for heat-assisted magnetic recording (HAMR) systems in both spin-stand experiment and micromagnetic model. DTG is an important parameter in HAMR. It describes the change in temperature in the vicinity of the write position. Recording conditions and medi...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2018-11, Vol.54 (11), p.1-4
Main Authors: Hernandez, Stephanie, Liu, Zengyuan, Granz, Steven, Gilbert, Ian, Mader, Drew, Blaber, Martin, Huang, Pin-Wei, Rea, Chris, Ju, Ganping, Rausch, Tim
Format: Article
Language:English
Subjects:
Anisotropy
Curie temperature
Curvature
Heat assisted magnetic recording (HAMR)
Heat-assisted magnetic recording
Laser modes
Laser transitions
Magnetic recording
Magnetism
Mathematical models
Media
media noise
micromagnetic
Micromagnetics
Parameters
Temperature
Temperature gradients
Temperature measurement
thermal gradient
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Summary:Downtrack thermal gradient (DTG) is calculated for heat-assisted magnetic recording (HAMR) systems in both spin-stand experiment and micromagnetic model. DTG is an important parameter in HAMR. It describes the change in temperature in the vicinity of the write position. Recording conditions and media properties affect the switching process, which in turn affects the measured DTG. Trends in DTG versus different recording conditions such as linear velocity and applied field showed very good agreement between experiment and model. The model is also used to quantify the effect on DTG from parameters that are difficult to measure, such as Curie temperature distributions, anisotropy field distributions, and curvature. Finally, a breakdown of the contribution of the different conditions and properties considered on DTG is presented.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2018.2846523