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  Magnetic properties of strained multiferroic CoCr2O4: A soft x-ray study

Windsor, Y. W., Piamonteze, C., Ramakrishnan, M., Scaramucci, A., Rettig, L., Huever, J. A., et al. (2017). Magnetic properties of strained multiferroic CoCr2O4: A soft x-ray study. Physical Review B, 95(22): 224413. doi:10.1103/PhysRevB.95.224413.

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PhysRevB.95.224413.pdf (Verlagsversion), 2MB
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2018
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APS
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 Urheber:
Windsor, Yaov William1, 2, Autor           
Piamonteze, C.2, Autor
Ramakrishnan, M.2, Autor
Scaramucci, A.3, 4, Autor
Rettig, Laurenz1, 2, Autor           
Huever, J. A.5, Autor
Bothschafter, E. M.2, Autor
Bingham, N. S.6, 7, Autor
Alberca, A.2, 8, Autor
Avula, S. R. V.2, Autor
Noheda, Beatriz5, Autor           
Staub, U.2, Autor
Affiliations:
1Physical Chemistry, Fritz Haber Institute, Max Planck Society, ou_634546              
2Swiss Light Source, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland, ou_persistent22              
3Laboratory for Scientific Development and Novel Materials, Paul Scherrer Institute, 5235 Villigen PSI, Switzerland, ou_persistent22              
4Materials Theory, ETH Zurich, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich, Switzerland, ou_persistent22              
5Zernike Institute for Advanced Materials, University of Groningen AG, Groningen, The Netherlands, ou_persistent22              
6Laboratory for Mesoscopic Systems, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland, ou_persistent22              
7Laboratory for Multiscale Materials Experiments, Paul Scherrer Institute, 5232 Villigen PSI, Switzerland, ou_persistent22              
8University of Fribourg, Department of Physics and Fribourg Centre for Nanomaterials, Chemin du Musee 3, CH-1700 Fribourg, Switzerland, ou_persistent22              

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 Zusammenfassung: Using resonant soft x-ray techniques we follow the magnetic behavior of a strained epitaxial film of CoCr2O4, a type-II multiferroic. The film is [110] oriented, such that both the ferroelectric and ferromagnetic moments can coexist in-plane. X-ray magnetic circular dichroism (XMCD) is used in scattering and in transmission modes to probe the magnetization of Co and Cr separately. The transmission measurements utilized x-ray excited optical luminescence from the substrate. Resonant soft x-ray diffraction (RXD) was used to study the magnetic order of the low temperature phase. The XMCD signals of Co and Cr appear at the same ordering temperature TC≈90K, and are always opposite in sign. The coercive field of the Co and of Cr moments is the same, and is approximately two orders of magnitude higher than in bulk. Through sum rules analysis an enlarged Co2+ orbital moment (mL) is found, which can explain this hardening. The RXD signal of the (q q 0) reflection appears below TS, the same ordering temperature as the conical magnetic structure in bulk, indicating that this phase remains multiferroic under strain. To describe the azimuthal dependence of this reflection, a slight modification is required to the spin model proposed by the conventional Lyons-Kaplan-Dwight-Menyuk theory for magnetic spinels.

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Sprache(n): eng - English
 Datum: 2017-03-022017-06-122017-06
 Publikationsstatus: Erschienen
 Seiten: 15
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1103/PhysRevB.95.224413
 Art des Abschluß: -

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Projektname : PSI-FELLOW - International Fellowship Program on Materials & Matter, Energy & Environment, Human Health & Life-Sciences, and Accelerator Technology
Grant ID : 290605
Förderprogramm : Funding Programme 7 (FP7)
Förderorganisation : European Commission (EC)

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Titel: Physical Review B
  Kurztitel : Phys. Rev. B
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: Woodbury, NY : American Physical Society
Seiten: 15 Band / Heft: 95 (22) Artikelnummer: 224413 Start- / Endseite: - Identifikator: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008