Grain boundaries in granular materials - A fundamental limit for thermal stability

L. Saharan, C. Morrison, Y. Ikeda, K. Takano, J. J. Miles, T. Thomson, T. Schrefl, G. Hrkac

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    We show that thermal-stability and the associated switching field in well segregated, nanoscale granular materials is explained by grain boundary and interface effects. Grain boundaries pose a fundamental limit on scaling rooted in their chemical and morphological structure, while exchange interactions across interfaces cause the switching to deviate from the expected coherent Stoner-Wohlfarth behaviour. Measurements and simulations of CoCrPt-systems show a clear shift in applied field angle behaviour, arising from exchange-coupling between magnetic-phases, while the quantitative switching field can only be explained by a transition layer surrounding the grains. These results are potentially significant for Heat-Assisted-Magnetic Recording and Bit-Patterned-Media Recording. © 2013 AIP Publishing LLC.
    Original languageEnglish
    Article number142402
    JournalApplied Physics Letters
    Issue number14
    Publication statusPublished - 2013


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