Inter/intra granular exchange and thermal activation in nanoscale granular magnetic materials

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

    Research output: Contribution to journalArticlepeer-review


    We explain the effect of inter/intra granular exchange coupling and thermal activation on the switching behavior of nano-scale granular magnetic materials. For an ideal, non-interacting granular system, the minimum switching field occurs at 45 from the easy axis of the grains. We show through simulation and measurements, using a CoCrPt oxide-segregated granular film as a model system, that there is a clear shift in the angle of applied field at which the minimum switching field occurs. This arises solely due to incoherent reversal induced by inter-granular exchange coupling or incoherency within larger grains, rather than thermal activation. © 2011 American Institute of Physics.
    Original languageEnglish
    Article number132507
    JournalApplied Physics Letters
    Issue number13
    Publication statusPublished - 26 Sept 2011


    • chromium compounds
    • cobalt compounds
    • exchange interactions (electron)
    • granular materials
    • magnetic switching
    • magnetic thin films
    • nanomagnetics
    • perpendicular magnetic recording
    • remanence
    • segregation


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