Accumulative Magnetic Switching of Ultrahigh-Density Recording Media by Circularly Polarized Light

Y. K. Takahashi, R. Medapalli, S. Kasai, J. Wang, K. Ishioka, S. H. Wee, O. Hellwig, K. Hono, E. E. Fullerton

Research output: Contribution to journalArticlepeer-review

38 Citations (Scopus)

Abstract

Magnetization control of ferromagnetic materials only by circularly polarized light has received increasing attention both as a fundamental probe of the interactions of light and magnetism but also for future high-density magnetic recording technologies. Here we show that for granular FePt films designed for ultrahigh-density magnetic recording, the optical magnetic switching by circularly polarized light is an accumulative effect from multiple optical pulses. The measured results can be reproduced by a simple statistical model where the probability of switching a grain depends on the helicity of the optical pulses. We further show the deterministic switching of high-anisotropy materials by the combination of circularly polarized light and modest external magnetic fields, thus, revealing a pathway towards technological implementation.

Original languageEnglish
Article number054004
JournalPhysical Review Applied
Volume6
Issue number5
DOIs
Publication statusPublished - 2016 Nov 14
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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