The Importance of Depth-Varying Fields for MAMR Switching-Field Reduction

Autor:	Byron Lengsfield, Terry Olson, Adam F. Torabi, Masato Shiimoto, Lei Xu, Mikito Sugiyama
Rok vydání:	2015
Předmět:	Physics Magnetization Magnetic anisotropy Hysteresis Nuclear magnetic resonance Condensed matter physics Field (physics) Area density Electrical and Electronic Engineering Magnetic hysteresis Ferromagnetic resonance Micromagnetics Electronic Optical and Magnetic Materials
Zdroj:	IEEE Transactions on Magnetics. 51:1-3
ISSN:	1941-0069 0018-9464
DOI:	10.1109/tmag.2015.2437074
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::662659775952da90f802cde8eade7a11 https://doi.org/10.1109/tmag.2015.2437074 Zobrazit plný text záznamu