Surface and interface properties of epitaxial Fe3O4 films studied by Mössbauer spectroscopy

Fujii, Toru; Takano, Mikio; Katano, Rintaro; Isozumi, Yasuhito; Bandō, Yoshichika

doi:10.1016/0304-8853(94)90683-1

Cited by 45 publications

(19 citation statements)

References 14 publications

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“…For instance, it has been found that: ͑a͒ it is much more difficult to fully saturate epitaxial films than bulk single crystals, 1,2 ͑b͒ ultrathin films show superparamagnetic behavior, 3 ͑c͒ the saturation magnetization of ultrathin films is considerably reduced with respect to the bulk value, 4 and ͑d͒ the local magnetic moments are out of plane in zero field. 1,3,5 In this article will discuss the extent to which the deviating behavior of thin Fe 3 O 4 films is related to an antiphase domain structure, as has been suggested recently. 2,3 …”

Section: Introductionmentioning

confidence: 88%

Anti-phase domains and magnetism in epitaxial magnetite layers

Hibma

Voogt

Niesen

et al. 1999

Journal of Applied Physics

130

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers)Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Recent studies show that the magnetic properties of epitaxial thin films of magnetite (Fe 3 O 4 ) deviate strongly from bulk behavior: it is difficult to saturate thin films, ultrathin films may become super paramagnetic, their saturation magnetization drops to zero, and the local magnetic moments are oriented out of plane in zero field. The possible relationship between this anomalous behavior and the occurrence of anti-phase boundaries ͑APBs͒ is discussed. Transmission electron microscopy images confirm that APBs are present in our Fe 3 O 4 films grown by molecular beam epitaxy on MgO͑100͒. Only APBs with out-of-plane shift vectors are visible. The much higher APB density found in sputtered films suggests that preparation conditions are important. To explain the deviating saturation and the superparamagnetic behavior of thin Fe 3 O 4 films at the same time, the magnetic coupling over the APB must be dramatically reduced due to spin disorder along the boundaries.

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Section: Introductionmentioning

confidence: 88%

Anti-phase domains and magnetism in epitaxial magnetite layers

Hibma

Voogt

Niesen

et al. 1999

Journal of Applied Physics

130

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“…5 A second issue in this field is the question whether or not a magnetically inactive or ''dead'' interface layer in the order of 10 Å is present in these layers. From neutron reflectrometry, 6 the thickness dependence of the magnetic moment, 5 Mössbauer spectrometry, 7 and also from the resistivity 8 and the magnetocrystalline anisotropy, 9 such a ''dead'' layer was reported. Nevertheless, in another study 4 Fe 3 O 4 /MgO multilayers with an Fe 3 O 4 layer thickness below 53 Å were characterized by Mössbauer spectroscopy and magnetization measurements, showing no surface effects.…”

Section: ͓S0021-8979͑99͒75508-8͔mentioning

confidence: 99%

Magnetization of Fe3O4/MgO multilayers studied with Mössbauer spectroscopy

Strijkers

Heijden

Swagten

et al. 1999

Journal of Applied Physics

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The magnetic behavior and structure of Fe3O4/MgO multilayers have been investigated with Mössbauer spectroscopy in field, magnetization measurements, and scanning tunneling microscopy. It is shown that detailed structural knowledge of the size of the structural domains and the width of the antiphase boundaries are indispensable in understanding the magnetization behavior of the films and the contradictory results reported in the literature.

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“…One of the layer materials currently under investigation is magnetite, F%O4, [1][2][3]. Determining the stoichiometry of thin layers of F%O4 is especially complicated.…”

Section: Introductionmentioning

confidence: 99%

“…unsuitable and XPS and AES can only be used to this end in combination with sputtering. A potentially relatively accurate, however, also a comparatively complicated method to asses layer stoichiometry is conversion electron M6ssbauer spectroscopy (CEMS) [3,6].…”

Section: Introductionmentioning

confidence: 99%

“…More indirect methods to estimate the stoichiometry of thin Fe30 4 layers, based upon the magnetic properties of Fe304, are the determination of the saturation magnetisation Ms [ 1 ] and the examination of the Verwey transition [ 2,3,7 ]. The saturation magnetisation Ms, however, provides an estimate with a large margin of error and may be subject to finite scaling effects.…”

Section: Introductionmentioning

confidence: 99%

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