Investigation of the stoichiometry of MBE-grown Fe3O4 layers by magneto-optical Kerr spectroscopy

Fontijn, Wfj Willem; Wolf, R.M.; Metselaar, R Ruud; Zaag, PJ van der

doi:10.1016/s0040-6090(96)08910-9

Cited by 31 publications

(18 citation statements)

References 17 publications

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“…Crystal structure Figure 1 shows the TEM images and selected area electronic diffraction (SAED) patterns of Fe 3 O 4 (100) [ Fig. 1(a) [22]. The discrepancy of the lattice constant between films and bulk is less than 0.3%, which can be ascribed to weak strain.…”

Section: Resultsmentioning

confidence: 99%

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Anisotropic magnetoresistance across Verwey transition in charge ordered Fe3O4 epitaxial films

Liu

Zhang

et al. 2017

Phys. Rev. B

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The anisotropic magnetoresistance (AMR) near the Verwey temperature (T V ) is investigated in charge ordered Fe 3 O 4 epitaxial films. When the temperature continuously decreases below T V , the symmetry of AMR in Fe 3 O 4 (100) film evolves from twofold to fourfold at a magnetic field of 50 kOe, where the magnetic field is parallel to the film surface, whereas AMR in Fe 3 O 4 (111) film maintains twofold symmetry. By analyzing AMR below T V , it is found that the Verwey transition contains two steps, including a fast charge ordering process and a continuous formation process of trimeron, which is comfirmed by the temperature-dependent Raman spectra. Just below T V , the twofold AMR in Fe 3 O 4 (100) film originates from uniaxial magnetic anisotropy. The fourfold AMR at a lower temperature can be ascribed to the in-plane trimerons. By comparing the AMR in the films with two orientations, it is found that the trimeron shows a smaller resistivity in a parallel magnetic field. The field-dependent AMR results show that the trimeron-sensitive field has a minimum threshold of about 2 kOe.

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Section: Resultsmentioning

confidence: 99%

“…Several factors, including stoichiometry, residual strain, difference in thermal expansion coefficients between substrates and Fe 3 O 4 films, and antiphase boundaries (APBs) can affect the Verwey transition [22,[28][29][30][31]. First, in O 4 reveals a nearly exact stoichiometry.…”

Section: Transport Propertiesmentioning

confidence: 99%

Anisotropic magnetoresistance across Verwey transition in charge ordered Fe3O4 epitaxial films

Liu

Zhang

et al. 2017

Phys. Rev. B

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“…The MOKE however remains unchanged, as it originates from a rotation of the incoming polarisation around the out of plane magnetic field component, which is invariant to rotation around the surface normal. From two raw measurements M 45 , M −45 we can then easily extract the RAS and MOKE signal:…”

Section: 39mentioning

confidence: 99%

“…Previous ellipsometric measurements have estimated the formation of a top surface oxidisation of up to 4 nm for Fe 3 O 4 (001) thin films grown on various lattice matched substrates. 45 The formation of such an surface maghemite 44 layer cannot only be the cause of a RAS response on a (110) surface, but can also alter its shape due to the change in overall reflectivity in such a multilayered system. As samples in Fig.…”

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confidence: 99%

Reflectance anisotropy spectroscopy of magnetite (110) surfaces

et al. 2014

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Reflectance anisotropy spectroscopy (RAS) has been used to measure the optical anisotropies of bulk and thin film Fe3O4(110) surfaces. The spectra indicate that small shifts in energy of the optical transitions, associated with anisotropic strain or electric field gradients caused by the (110) surface termination or an native oxide layer, are responsible for the strong signal observed. The RAS response was then measured as a function of temperature. A distinct change in the RAS line shape amplitude was observed in the spectral range from 0.8 to 1.6 eV for temperatures below the Verwey transition of the crystal. Finally thin film magnetite was grown by molecular beam epitaxy on MgO(110) substrates. Changes in the RAS spectra were found for different film thickness, suggesting that RAS can be used to monitor the growth of magnetite (110) films in situ. The thickness dependence of the RAS is discussed in terms of various models for the origin of the RAS signal.

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“…A difference in nucleation behavior between growth on a neutral CoO͑100͒ surface and a polar CoO͑111͒ surface and the ensuing difference in APB density seems a natural explanation, as it was verified that stoichiometric Fe 3 O 4 was grown. 12,15 The actual nature of the magnetic coupling over the APB will be undoubtedly much more complicated than suggested by the simple model cited above. Since the boundaries are formed during the coalescence of islands, the APBs will have curved shapes and little preferred orientation, as is evident from Fig.…”

Section: Antiphase Domains and Magnetismmentioning

confidence: 99%

Anti-phase domains and magnetism in epitaxial magnetite layers

Hibma

Voogt

Niesen

et al. 1999

Journal of Applied Physics

129

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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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Investigation of the stoichiometry of MBE-grown Fe3O4 layers by magneto-optical Kerr spectroscopy

Cited by 31 publications

References 17 publications

Anisotropic magnetoresistance across Verwey transition in charge ordered Fe3O4 epitaxial films

Anisotropic magnetoresistance across Verwey transition in charge ordered Fe3O4 epitaxial films

Reflectance anisotropy spectroscopy of magnetite (110) surfaces

Anti-phase domains and magnetism in epitaxial magnetite layers

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