Multiferroic composites for magnetic data storage beyond the super-paramagnetic limit

Melvin Vopson, E. Zemaityte, M. Spreitzer, Esmaeil Namvar

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    Abstract

    Ultra high-density magnetic data storage requires magnetic grains of <5 nm diameters. Thermal stability of such small magnetic grain demands materials with very large magneto-crystalline anisotropy, which makes data write process almost impossible, even when Heat Assisted Magnetic Recording (HAMR) technology is deployed. Here, we propose an alternative method of strengthening the thermal stability of the magnetic grains via elasto-mechanical coupling between the magnetic data storage layer and a piezo-ferroelectric substrate. Using Stoner-Wohlfarth single domain model, we show that the correct tuning of this coupling can increase the effective magneto-crystalline anisotropy of the magnetic grains making them stable beyond the super-paramagnetic limit. However, the effective magnetic anisotropy can also be lowered or even switched off during the write process by simply altering the applied voltage to the substrate. Based on these effects, we propose two magnetic data storage protocols, one of which could potentially replace HAMR technology, with both schemes promising unprecedented increases in the data storage areal density beyond the super-paramagnetic size limit.
    Original languageEnglish
    Article number113910
    JournalJournal of Applied Physics
    Volume116
    Issue number11
    Early online date18 Sep 2014
    DOIs
    Publication statusPublished - 21 Sep 2014

    Keywords

    • novel magnetic data storage
    • multiferroic data storage
    • super-paramagnetic limit

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    • Western Digital

      Melvin Vopson (Visiting researcher)

      11 Jul 201818 Jul 2018

      Activity: Visiting an external organisation typesVisiting an external academic institution

    • CIMTEC Congress 2016

      Melvin Vopson (Invited speaker)

      4 Jun 2016

      Activity: Participating in or organising an event typesParticipation in conference

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