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  Evidence for largest room temperature magnetic signal from Co2+ in antiphase-free & fully inverted CoFe2O4 in multiferroic-ferrimagnetic BiFeO3-CoFe2O4 nanopillar thin films

Wang, X., Hu, Z., Agrestini, S., Herrero-Martín, J., Valvidares, M., Sankar, R., et al. (2021). Evidence for largest room temperature magnetic signal from Co2+ in antiphase-free & fully inverted CoFe2O4 in multiferroic-ferrimagnetic BiFeO3-CoFe2O4 nanopillar thin films. Journal of Magnetism and Magnetic Materials, 530: 167940, pp. 1-6. doi:10.1016/j.jmmm.2021.167940.

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 Creators:
Wang, Xiao1, Author              
Hu, Zhiwei2, Author              
Agrestini, Stefano3, Author              
Herrero-Martín, Javier4, Author
Valvidares, Manuel4, Author
Sankar, Raman4, Author
Chou, Fang-Cheng4, Author
Chu, Ying-Hao4, Author
Tanaka, Arata4, Author
Tjeng, Liu Hao5, Author              
Pellegrin, Eric4, Author
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863461              
3Stefano Agrestini, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863459              
4External Organizations, ou_persistent22              
5Liu Hao Tjeng, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863452              

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Free keywords: Cobalt ferrite, Multiferroic, Nanopillars, Spinel, Spintronics, XMCD, Circular dichroism spectroscopy, Dichroism, Magnetic moments, Spintronics, Thin films, Antiphase, Cobalt ferrites, Ferrimagnetics, Multiferroics, NanoPillar, Spinel, Spintronics application, Thin film systems, Thin-films, X-ray magnetic circular dichroism, Iron compounds
 Abstract: The ongoing quest for defect-free thin films systems that are apt for being used as spin filtering materials for spintronic applications did yet not deliver satisfying results regarding materials that would be up to the pertinent requirements. Using soft x-ray absorption spectroscopy (XAS) and x-ray magnetic circular dichroism (XMCD) measurements at the Co-L2,3 and Fe-L2,3 absorption edges, we have investigated the magnetic properties of a nanostructured thin film with self-assembled CoFe2O4 nanopillars embedded in BiFeO3, the latter being a well-known system for its combined multiferroic and spintronic properties. In this BiFeO3-CoFe2O4 heterostructure we observed a significant XMCD signal at the Co-L2,3 edges which turns out to be the largest among the presently reported for Co ions at room temperature. A quantitative analysis of the Co-L2,3 spectra unveils that such a large Co-L2,3 XMCD signal stems from the impeccable fully inverted spinel ordering of the A- and B-sites in antiphase-free CoFe2O4 nanopillars. This twofold perfect CoFe2O4 ordering feature yields an unprecedented optimization within a multifunctional ferrimagnetic-multiferroic thin film system highly relevant for spintronic applications, also resulting in an equally unprecedented macroscopic magnetic moment for such material as compared to its pure form as well as to technologically relevant thin film compound systems. © 2021 Elsevier B.V.

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Language(s): eng - English
 Dates: 2021-03-232021-03-23
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.jmmm.2021.167940
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Title: Journal of Magnetism and Magnetic Materials
  Other : Journal of Magnetism and Magnetic Materials: MMM
  Abbreviation : J. Magn. Magn. Mater.
Source Genre: Journal
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Publ. Info: Amsterdam : NH, Elsevier
Pages: - Volume / Issue: 530 Sequence Number: 167940 Start / End Page: 1 - 6 Identifier: ISSN: 0304-8853
CoNE: https://pure.mpg.de/cone/journals/resource/954925512464