Visible to the public Micromagnetic Study of Media Noise Plateau in Heat-Assisted Magnetic Recording

TitleMicromagnetic Study of Media Noise Plateau in Heat-Assisted Magnetic Recording
Publication TypeJournal Article
Year of Publication2019
AuthorsHsu, W., Victora, R. H.
JournalIEEE Transactions on Magnetics
Keywordscompositionality, cyber physical systems, heat spot, Heat-assisted magnetic recording, Heat-assisted magnetic recording (HAMR), Heating systems, high recording density, integrated media noise power, intermediate recording density, Internet of Things, linear density, low recording density, magnetic recording noise, Magnetic Remanence, Media, media noise, media noise plateau, micromagnetic simulation, micromagnetic study, micromagnetics, Perpendicular magnetic anisotropy, perpendicular magnetic recording, pubcrawl, recording physics, remanence, remanence noise, Resiliency, temperature gradient, transition noise
AbstractThe relationship between integrated media noise power and linear density in heat-assisted magnetic recording (HAMR) is discussed. A noise plateau for intermediate recording density has been observed in HAMR, similar to that found in perpendicular magnetic recording (PMR). Here, we show, by changing the temperature profile of the heat spot in HAMR, that we can tune the noise plateau regions to different recording densities. The heat spot with sharp temperature gradient favors a plateau at high recording density, while the heat spot with gradual temperature gradient favors a plateau at low recording density. This effect is argued to be a consequence of the competition between transition noise and remanence noise in HAMR.
Citation Keyhsu_micromagnetic_2019