Competing anisotropies in holmium-erbium superlattices

J.A. Simpson, D.F. McMorrow, R.A. Cowley, D.A. Jehan, R.C.C. Ward, M.R. Wells, K.N. Clausen

    Research output: Contribution to journalJournal articleResearch

    Abstract

    The effect of competing crystal-field anisotropies on magnetic order has been investigated in a series of Ho/Er superlattices. For temperatures in the interval T(N)(Er) less-than-or-equal-to T less-than-or-equal-to T(N)(Ho) the Ho basal-plane order propagates coherently through the paramagnetic Er with a typical length scale of 1000 angstrom. Below T(N)(Er) the coherence length of the basal-plane order decreases, while the longitudinal component of the Er moments fails to order across the Ho block. It is argued that these results require an extension of current models of indirect exchange in superlattices to explicitly include the superlattice band structure.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume73
    Issue number8
    Pages (from-to)1162-1165
    ISSN0031-9007
    DOIs
    Publication statusPublished - 1994

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