Film thickness and temperature dependence of the magnetic properties of pulsed-laser-deposited Fe3O4 films on different substrates

Kale, Sangeeta ; Bhagat, S. M. ; Lofland, S. E. ; Scabarozi, T. ; Ogale, S. B. ; Orozco, A. ; Shinde, S. R. ; Venkatesan, T. ; Hannoyer, B. ; Mercey, B. ; Prellier, W. (2001) Film thickness and temperature dependence of the magnetic properties of pulsed-laser-deposited Fe3O4 films on different substrates Physical Review B, 64 (20). 205413_1-205413_9. ISSN 0163-1829

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Official URL: http://prb.aps.org/abstract/PRB/v64/i20/e205413

Related URL: http://dx.doi.org/10.1103/PhysRevB.64.205413

Abstract

We report a systematic study of <100> epitaxial films of magnetite (Fe3O4) of thickness 300-2000 Å, grown on single-crystal substrates (MgO, MgAl2O4, and SrTiO3) using pulsed laser deposition. The magnetic state was explored by measuring magnetization, conversion-electron Mossbauer spectroscopy, and ferromagnetic resonance. At 300 K, films grown on MgAl2O4 and SrTiO3 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.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
ID Code:26858
Deposited On:08 Dec 2010 13:04
Last Modified:11 Jun 2011 11:11

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