Phys. Rev. B 57, R8107–R8110 (1998)

Superparamagnetic behavior of structural domains in epitaxial ultrathin magnetite films

Abstract

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F. C. Voogt^*, T. T. M. Palstra, L. Niesen, O. C. Rogojanu, M. A. James, and T. Hibma
Materials Science Centre, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands

Received 31 October 1997; published in the issue dated 1 April 1998

We provide evidence that thin films of magnetite Fe₃O₄ epitaxially grown on single-crystalline MgO(100), form domains with unique magnetic properties. Strong 180° Fe-O-Fe superexchange paths at antiphase domain boundaries result in a frustration of the interdomain interactions. Probe-layer Mössbauer spectroscopy shows superparamagnetic behavior in the entire film, in spite of the nearly perfect layer-by-layer growth. Superconducting quantum interference device magnetometry is used to determine the temperature and thickness dependence of the superparamagnetic blocking temperatures.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.57.R8107

DOI:

10.1103/PhysRevB.57.R8107

PACS:

75.70.Ak, 68.55.-a, 76.80.+y

^*Author to whom correspondence should be addressed. Electronic address: VOOGT@PHYS.RUG.NL

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Phys. Rev. B 57, R8107–R8110 (1998)

Superparamagnetic behavior of structural domains in epitaxial ultrathin magnetite films