Magnetic domain structures of Sr3Co2Z hexaferrite by TEM

•Magnetic domain structure is measured by electron holography and Lorentz microscopy.•Magnetic domain structure (MDE) of Co Z hexaferrites is shown.•MDE was measured in crystallographic orientations; c axis and perpendicular to that.•MDE measured in c crystallographic orientation show high angle dom...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2020-05, Vol.501, p.166423, Article 166423
Main Authors: Salazar, William, Moreno-Aldana, Luis Carlos, Sandino del Busto, John William
Format: Article
Language:English
Subjects:
Chemical synthesis
Crystal structure
Crystallography
Domain walls
Electron beams
Electron holography
Hexaferrites
Holography
Ion beams
Lorentz microscopy
Magnetic domains
Magnetic flux
Magnetic materials
Magnetism
Photomicrographs
Transmission electron microscopy
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Summary:•Magnetic domain structure is measured by electron holography and Lorentz microscopy.•Magnetic domain structure (MDE) of Co Z hexaferrites is shown.•MDE was measured in crystallographic orientations; c axis and perpendicular to that.•MDE measured in c crystallographic orientation show high angle domain structure.•This last result agrees with literature reported results.•MDE perpendicular to c shows domain structure with like vortex structure.•This result has not yet reported in the literature.•Electron holography has demonstrated to be powerful tool to study MDE. The magnetic domain structure of Sr3Co2Z hexaferrite related to crystal orientation is investigated by Lorentz microscopy and electron holography. The sample of Sr3Co2Z, prepared by citrate method, was milled in two different crystallographic orientations by focused ion beam. One of them was prepared with its c crystallographic axis direction parallel to the electron beam at the TEM, and the other one, perpendicular to this direction. In both specimens, Lorentz micrographs revealed some structure domain walls e.g. stripes and magnetic flux-closure. Furthermore, phase micrographs acquired by electron holography revealed magnetic domain structures with 145.3° ± 5.2° domain walls.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2020.166423