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Recent Progress in Mössbauer Studies of Iron-Based Spinel Oxide Nanoparticles

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Surfaces and Interfaces of Metal Oxide Thin Films, Multilayers, Nanoparticles and Nano-composites

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Abstract

Fundamentals of magnetic nanoparticles (NPs) have been explored since mid of last century; however, the importance of these tiny magnets has been accented within last 20 years due to their great application potential in biomedicine and data storage. The most studied materials are spinel oxides, among them ferrites, which are favoured thanks to their sufficient chemical stability, well-established protocols of preparation and surface modifications, and very good magnetic properties. The presence of iron in the lattice enables one to study the spinel ferrite NPs from the chemical, structural and magnetic point of view by a unique probe operating at the very local level, which is the Mössbauer spectroscopy (MS). The goal of this chapter is to give a general picture of current understanding the magnetic properties of spinel ferrite NPs based on MS and other experimental techniques. First, the apparent, but manifold term—a “core–shell” NP—is discussed from the perspective of internal chemical, structural and magnetic assemblage within a single NP seen by different experimental methods. Fundamentals of MS with focus on single-domain NPs are given, followed by a summary on the most innovative works published within last ~ 10 years discussing the core–shell phenomenon. Final remarks emphasizing possible directions of magnetic NP research are closing the chapter.

Preface

When being asked to contribute to this book, my idea was to discuss the peculiarities in understanding magnetic behaviour of nanoscale oxide magnets, in particular the relevance of the classical and quantum pictures featuring their magnetic properties. However, in November 2018, my great friend and colleague Daniel Nižňanský passed away. He attracted me to the fascinating field of nanomagnetism, and in particular, he always contributed significantly with his enormous expertize in synthesis and Mössbauer spectroscopy of fine particles of magnetic oxides. In memory of his great contribution to the magnetic nanoparticle research, I will provide current state of the art in this field from the perspective of applying Mössbauer spectroscopy techniques to magnetic spinel oxide nanoparticles. At this point, I would like to express my great thanks to my outstanding students and colleagues: Barbara Pacáková, Simona Kubíčková and Alice Mantlíková who did an excellent job and substantial advancement of the field during their doctoral studies. Finally, my great thanks belong to Puerto Morales, Alejandro Gomez Roca, Gorka Salas, Carla Cannas, Marco Sana, Valentina Mameli, Dominika Zakutna and Anton Repko for unforgettable collaboration and precious inputs on various aspects related to magnetic nanoparticles.

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Acknowledgments

This work was supported by the European Research Council (ERC-Stg-716265) and Ministry of Education, Youth and Sports of the Czech Republic under Operational Programme Research, Development and Education, project Carbon allotropes with rationalized nanointerfaces and nanolinks for environmental and biomedical applications (CARAT), number CZ.02.1.01/0.0/0.0/16_026/0008382.

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  1. Department of Condensed Matter Physics, Charles University, Prague, Czech Republic

    Jana K. Vejpravova

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  1. Jana K. Vejpravova
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  1. MagneticNanostrutures Group, Institut Català de Nanociència i Nanotecnologia, Barcelona, Spain

    Alejandro G. Roca

  2. SIT Research Laboratories, Shibaura Institute of Technology, Saitama, Japan

    Paolo Mele

  3. Creative Interdisciplinary Research Division, Tohoku University, Sendai, Japan

    Hanae Kijima-Aoki

  4. Department of Chemistry and Industrial Chemistry, University of Pisa, Pisa, Italy

    Elvira Fantechi

  5. Department of Condensed Matter Physics, Charles University, Prague, Czech Republic

    Jana K. Vejpravova

  6. Department of Low-dimensional Systems, J. Heyrovsky Institute of Physical Chemicals, Prague, Czech Republic

    Martin Kalbac

  7. Kanagawa Institute of IndustrialScience & Technology, Ebina, Kanagawa, Japan

    Satoru Kaneko

  8. Japan Advanced Chemicals, Atsugi, Kanagawa, Japan

    Tamio Endo

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Vejpravova, J.K. (2021). Recent Progress in Mössbauer Studies of Iron-Based Spinel Oxide Nanoparticles. In: Roca, A.G., et al. Surfaces and Interfaces of Metal Oxide Thin Films, Multilayers, Nanoparticles and Nano-composites. Springer, Cham. https://doi.org/10.1007/978-3-030-74073-3_1

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