Abstract
We report the selection of materials and design of spin-torque oscillators (STOs) which are able to operate in an alternative magnetic field (variable frequency) of magnitude $\sim 8000$ Oe, generate large 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 have the least driving current are also presented. This paper also covers the material choice, layer-stack optimization, and process development on Co x Pt1− x alloy films with extremely high coercivity of more than 1.5 T ( $K_{u}$ of about $\mathbf {1.5\times 10^{7}}$ erg/cc), well-isolated small grains of size 6–7 nm, for the extension of perpendicular magnetic recording and MAMR.
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