Atomistic simulation of sub-nanosecond non-equilibrium field cooling processes for magnetic data storage applications

Abstract

Thermally assisted magnetic writing is an important technology utilizing temperature dependent magnetic properties to enable orientation of a magnetic data storage medium. Using an atomistic spin model we study non-equilibrium field cooled magnetization processes on sub-nanosecond timescales required for device applications. We encapsulate the essential physics of the process in a TRM-T curve and show that for fast timescales heating to the Curie temperature is necessary where the magnetic relaxation time is shortest. Furthermore we demonstrate the requirement for large magnetic fields to achieve a high thermoremanent magnetization necessary for fast recording or data rates.