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journal article·2024-03Open access

Unraveling Exchange Coupling in Ferrites Nano‐Heterostructures

Pierfrancesco Maltoni, Gianni Barucca, Bogdan Rutkowski, Maria Chiara Spadaro, Petra E. Jönsson, Gaspare Varvaro, Nader Yaacoub, José A. De Toro, Davide Peddis, Roland Mathieu

Small· Volume 20· Issue 10
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Abstract

Abstract The magnetic coupling of a set of SrFe12O19/CoFe2O4 nanocomposites is investigated. Advanced electron microscopy evidences the structural coherence and texture at the interfaces of the nanostructures. The fraction of the lower anisotropy phase (CoFe2O4) is tuned to assess the limits that define magnetically exchange‐coupled interfaces by performing magnetic remanence, first‐order reversal curves (FORCs), and relaxation measurements. By combining these magnetometry techniques and the structural and morphological information from X‐ray diffraction, electron microscopy, and Mössbauer spectrometry, the exchange intergranular interaction is evidenced, and the critical thickness within which coupled interfaces have a uniform reversal unraveled.
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Research context

Nanomaterials

OpenAlex topics: Magnetic Properties and Synthesis of Ferrites · Magnetic properties of thin films · Iron oxide chemistry and applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Materials Science and Engineering Uppsala University Box 35 Uppsala 751 03 Sweden

Dipartimento di Scienze e Ingegneria della Materia dell'Ambiente ed Urbanistica–SIMAU Università Politecnica delle Marche Ancona 60131 Italy

Faculty of Metals Engineering and Industrial Computer Science AGH University of Science and Technology Al. A. Mickiewicza 30 Kraków 30‐059 Poland

Department of Physics and Astronomy Uppsala University Box 516 Uppsala SE‐751 20 Sweden

Istituto di Struttura della Materia, nM^{2}‐lab Consiglio Nazionale delle Ricerche Monterotondo Scalo Rome 00015 Italy

Institut des Molécules et Matériaux du Mans, CNRS UMR‐6283 Le Mans Université Le Mans F‐72085 France

Instituto Regional de Investigación Científica Aplicada (IRICA) and Departamento de Física Aplicada Universidad de Castilla‐La Mancha Ciudad Real 13071 Spain

Dipartimento di Chimica e Chimica Industriale & INSTM, nM2‐Lab Università degli Studi di Genova Via Dodecaneso 31 Genova 1‐16146 Italy

Funding

Vetenskapsrådet · Energimyndigheten

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