Quantum tunneling of magnetization in single domain particles

J. Tejada, L. Balcells, Søren Linderoth, R. Perzynski, B. Rigau, B. Barbara, J.C. Bacri

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    We present a study of the magnetic relaxation of several ferrofluids composed of particles of about 40 Å in diameter (Fe3O4FeC, CoFe2O4). Our key observation is a nonthermal character of the relaxation below 3 K for the CoFe2O4 ferrofluid and below 1 K for the FeC ferrofluid. The crossover temperature from thermal to nonthermal (quantum) regime is in accordance with theoretical suggestions of macroscopic quantum tunneling of magnetization in single domain particles.
    Original languageEnglish
    JournalJournal of Applied Physics
    Volume73
    Issue number10
    Pages (from-to)6952-6954
    ISSN0021-8979
    DOIs
    Publication statusPublished - 1993

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