Localized Microwave Field Generation for Perpendicular Recording at Deep Subcoercivity

摘要

Increasing area recording density requires an accompanied increase of the medium coercivity while maintaining sufficient thermal magnetic stability. However, today, the coercivity of the thin film recording media is rapidly approaching the hard limit of the magnetic field produced by any available recording head. In order to overcome such a limit, a scheme using localized microwave field at the ferromagnetic resonance frequency of the medium has been proposed to enable writing at field substantially below the medium coercivity [1]. In this paper we present a scheme for generating the localized ac field at a wide range of ultra-high frequencies.