Film thickness and temperature dependence of the magnetic properties of pulsed-laser-deposited (formula presented) films on different substrates

Sangeeta Kale, S. M. Bhagat, S. E. Lofland, T. Scabarozi, S. B. Ogale, A. Orozco, S. R. Shinde, T. Venkatesan, B. Hannoyer, B. Mercey, W. Prellier

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

We report a systematic study of 〈100〉 epitaxial films of magnetite (formula presented) of thickness 300–2000 Å, grown on single-crystal substrates (MgO, (formula presented) and (formula presented)) using pulsed laser deposition. The magnetic state was explored by measuring magnetization, conversion-electron Mössbauer spectroscopy, and ferromagnetic resonance. At 300 K, films grown on (formula presented) and (formula presented) are, more or less, normal for all thicknesses. That is, the in-plane anisotropy is fourfold. The films on MgO, however, show no in-plane anisotropy if the thickness is less than ∼800 Å. In contrast to some previous claims, the present films exhibit magnetic saturation at quite modest (⩽2 kOe) fields. We propose simple models to account for a variety of observations. In addition to the shape anisotropy, strains appear to play the major role in determining the variation of the magnetic behavior with thickness, substrate, and temperature.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume64
Issue number20
DOIs
StatePublished - 2001

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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