Influence of exchange on signal-to-noise ratio in [CoX/Pt]4 media | Zendy

Zhen Zhao | Zendy; Jiangnan Li | Zendy; Longze Wang | Zendy; Dan Wei | Zendy

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Influence of exchange on signal-to-noise ratio in [CoX/Pt]4 media

Author(s) -

Zhen Zhao,

Jiangnan Li,

Longze Wang,

Dan Wei

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 - 10.1063/1.4978457

Subject(s) - micromagnetics , perpendicular recording , recording media , condensed matter physics , anisotropy , grain size , saturation (graph theory) , materials science , signal to noise ratio (imaging) , nuclear magnetic resonance , magnetic anisotropy , computational physics , perpendicular , physics , magnetic field , magnetization , optics , composite material , computer science , mathematics , multimedia , geometry , quantum mechanics , combinatorics

In longitudinal hard disk drives, the medium Signal-to-Noise Ratio (SNR) is higher with better grain segregation or lower inter-grain exchange. In current energy assisted magnetic recording system, multilayer perpendicular media are utilized; thus, it is significant to study the influence of grain segregation on SNR, as well as the relevant percolation phenomenon, to give suggestions on the recording media design. In this study, micromagnetic recording models of Microwave Assisted Magnetic Recording (MAMR) is built up to calculate SNR to find optimized [CoX/Pt]4 media parameters such as the inter-grain exchange Agb and the anisotropy orientation distribution αθ, with different field generation layer (FGL) saturation in the spin torque oscillator (STO). The constrained relationship between Agb and αθ in MAMR have been estimated, and the medium SNR will be optimized in the perpendicular [CoX/Pt]4 with a proper but not lowest exchange

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