Development of Spin-Torque Oscillators and High $!_}$ CoPt Media With Small Grain Size for Microwave-Assisted Magnetic Recording


We tend to report the selection of materials and style of spin-torque oscillators (STOs) which are able to control in an alternative magnetic field (variable frequency) of magnitude $sim 8000$ Oe, generate massive enough in-plane ac magnetic field in the recording media, and have tunable high frequency at low driving current for microwave-assisted magnetic recording (MAMR) based on micromagnetic simulations. The mechanism and integration approaches of STOs with the current recording system to possess the smallest amount driving current are presented. This paper conjointly covers the fabric choice, layer-stack optimization, and process development on Cox Pt1−x alloy films with very high coercivity of a lot of than one.five T ( $K_u$ of regarding $mathbf 1.5times 10^7$ erg/cc), well-isolated tiny grains of size half-dozen–7 nm, for the extension of perpendicular magnetic recording and MAMR.

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