Exchange coupled composite media for heat assisted magnetic recording | Zendy

Zengyuan Liu | Zendy; R. H. Victora | Zendy

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Exchange coupled composite media for heat assisted magnetic recording

Author(s) -

Zengyuan Liu,

R. H. Victora

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4978461

Subject(s) - full width at half maximum , superparamagnetism , materials science , condensed matter physics , composite number , coupling (piping) , layer (electronics) , magnetic field , nuclear magnetic resonance , physics , nanotechnology , optoelectronics , composite material , quantum mechanics , magnetization

Micromagnetic simulation is used to calculate the temperature derivative of the switching field dHsw/dT for a composite media with a superparamagnetic writing layer. The results show that dHsw/dT is reduced for a defined probability of switching, and switching field line width remains almost unchanged. An analytical two-spin model is established to relate exchange coupling between the two layers Jex to energy barrier and the switching probability distribution (SPD). Both the analytical model and micro-magnetic simulation show that the full-width half-maximum FWHM∝(Jex)−0.5 and writing temperature Tsw∝(Jex)−1. It is also found that the writing layer leads the storage layer during switching

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