Hall magnetometry measurements of bulk single crystalline rings

M. Charalambous, R. Koch, A. Kent, W. Masselink

    Research output: Contribution to journalArticle

    Abstract

    The (Formula presented) characteristics of (Formula presented) rings are measured down to the subpicovolt level using a Hall magnetometry technique. Non-Ohmic response of the rings to an ac magnetic field is detected below a temperature (Formula presented) Fourier analysis of the data demonstrates appearance of higher harmonics up to order 9. The frequency and amplitude dependence of the harmonic susceptibilities is analyzed. The quasistatic (Formula presented) response of the ring is obtained after using a triangular wave form, providing conclusive evidence for the vortex-glass phase transition in twinned crystals. Different techniques are employed to improve the resolution of the method, including use of different semiconducting materials and use of a bridge circuit. The resolution achieved is (Formula presented) in a field of 1 T, corresponding to a relative resolution of (Formula presented) and a magnetic moment of (Formula presented).

    Original languageEnglish (US)
    Pages (from-to)9510-9523
    Number of pages14
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume58
    Issue number14
    DOIs
    StatePublished - Jan 1 1998

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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