Energy barriers in patterned media

Jeroen de Vries

    Research output: ThesisPhD Thesis - Research UT, graduation UT

    195 Downloads (Pure)


    Due to the fact that thermal activation aids in overcoming the energy barrier, the required field for reversal varies from instance to instance for the same island. This thermally induced switching field distribution can be used to determine the difference in energy barrier of magneticallyweak and strong islands. In chapter 3 an alloy aswell as twomultilayer structures are compared using this method. In chapter 4 the temperature dependence of the thermally induced switching field distribution is investigated. For archival purposes it is not the data capacity but the longevity of the data which is most relevant. When we want store information which will outlast the human race, the medium will have different requirements than a mediumused for everyday information storage. For a hard disk, aminimumrequired storage time of 10 years is acceptable, but for such an archival storage system, 1 million to 1 billion years is the relevant timescale. In chapter 5 a storage system has been investigated with high energy barriers which should make data storage for such timescales possible.
    Original languageEnglish
    QualificationDoctor of Philosophy
    Awarding Institution
    • University of Twente
    • Elwenspoek, Michael Curt, Supervisor
    • Abelmann, Leon , Advisor
    Thesis sponsors
    Award date17 Oct 2013
    Place of PublicationEnschede
    Print ISBNs978-90-365-0640-3
    Publication statusPublished - 17 Oct 2013


    • IR-87435
    • METIS-298012
    • TSTNE-Magnet-AHE: Anomalous Hall Effect
    • EWI-24448
    • switching field distribution
    • TST-SMI: Formerly in EWI-SMI


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