Abstract
Microwave assisted magnetic recording (MAMR) was proposed to increase the data storage areal density in hard disk drives [1]. With a localized AC field generated by a spin torque oscillator (STO), MAMR significantly reduces the switching field when the AC field frequency matches the ferromagnetic resonance frequency of the media elements [2]. In this study we present micromagnetic modeling of media switching-field reduction due to AC fields at GHz frequencies. We employ a 4-layer media model based on current exchange-coupled media with the top layer describing a large lateral exchange “cap” with three low lateral exchange “oxide” layers below. We examine hysteresis loops in two scenarios: depth invariant applied fields (external and AC), and depth invariant external field with depth varying AC field. We then do a DC-band write study with realistic writer field and macrospin-based STO field to gauge switching-field reduction in a scenario more similar to actual recording.
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