Anomalous damping dependence of the switching time in Fe/FePt bilayer recording media

Razvan V. Ababei, Matthew O.A. Ellis, Richard F.L. Evans, Roy W. Chantrell

Research output: Contribution to journalArticlepeer-review


Gilbert damping plays a significant role in magnetic reversal processes, and it determines the timescale of the switching. Here we investigate the properties of exchange-coupled composite media and the dependence of the switching time on the damping constant of the soft layer using atomistic spin dynamics. For a bilayer Fe/FePt medium, we find an anomalous increase of the switching time with increasing soft layer damping constant. The reversal occurs via a high-temperature exchange spring, and we show that the increase in the switching time is related to a corresponding increase in the time to establish the exchange spring. This phenomenon is delicately balanced in that the switching time increase occurs only in fields close to the coercivity.

Original languageEnglish
Article number024427
Number of pages6
JournalPhysical Review B
Issue number2
Publication statusPublished - 24 Jan 2019

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