Superparamagnetic behavior in Fe ultrathin films on GaN(0001)

P.K.J. Wong, W. Zhang, W. Zhang, X.G. Cui, I.G. Will, Y.B. Xu, Z.K. Tao, Xueliang Li, X. Li, Z.L. Xie, R. Zhang

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    Abstract

    In this paper, growth, structural and magnetic properties of ultrathin Fe grown on GaN(OOOl) by molecular beam epitaxy. The films and their surfaces were monitored by in-situ reflection high energy electron diffraction (RHEED) and a crystal thickness monitor. The magnetic properties of the samples were determined by a superconducting quantum interference device (SQUID) magnetometer. Superparamagnetism (SPM) of the ultrathin Fe can be activated at the ambient temperature.the hysteresis loop of an as-deposited 5 ML Fe(llO) film on GaN(0001) taken at RT and reveals that the loop on one hand has an unsaturated magnetization and on the other hand possesses tiny but noticeable Mr and Hc. These two characteristics as a whole imply a coexistence of SPM and weak FM in the ultrathin film. In order to gain further insight into this mixed magnetic state, temperature dependence of the magnetization M(T) in the form of field cooling (FC) and zero field cooling (ZFC) curves of the 5 ML sample was measured by SQUID in a T range between 5 and 300 K.
    Original languageUndefined
    Title of host publicationProceedings of the 8th International Vacuum Electron Sources Conference and Nanocarbon, IVESC 2010
    Place of PublicationUSA
    PublisherIEEE
    Pages494-495
    Number of pages2
    ISBN (Print)978-1-4244-6645-0
    DOIs
    Publication statusPublished - Oct 2010

    Publication series

    Name
    PublisherIEEE

    Keywords

    • METIS-279136
    • EWI-19685
    • IR-76076

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