Feature of Nonlinear Electromagnetic Properties and Local Atomic Structure of Metals in Two Systems of Nanocomposites Co<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub> and (CoFeZr)<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub>
Based on modern concepts of the nonlinear percolation mechanisms of electrical and magnetic properties in granular metal–dielectric nanocomposites, the authors present for the first time a comparative analysis of their own results of a comprehensive study of nonlinear electromagnetic properties in t...
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2025-03-01
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| author | Evelina Pavlovna Domashevskaya Sergey Alexandrovich Ivkov Elena Alexandrovna Ganshina Lyubov Vladimirovna Guda Valeriy Grigoryevich Vlasenko Alexander Victorovich Sitnikov |
| author_facet | Evelina Pavlovna Domashevskaya Sergey Alexandrovich Ivkov Elena Alexandrovna Ganshina Lyubov Vladimirovna Guda Valeriy Grigoryevich Vlasenko Alexander Victorovich Sitnikov |
| author_sort | Evelina Pavlovna Domashevskaya |
| collection | DOAJ |
| description | Based on modern concepts of the nonlinear percolation mechanisms of electrical and magnetic properties in granular metal–dielectric nanocomposites, the authors present for the first time a comparative analysis of their own results of a comprehensive study of nonlinear electromagnetic properties in two nanocomposite systems: metal–dielectric Co<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub> and alloy–dielectric (CoFeZr)<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub>, obtained by ion-beam sputtering of composite targets in a wide range of different compositions. For the first time, the features of the influence of atomic composition and structural-phase transitions on nonlinear magnetoresistive, magnetic, and magneto-optical properties in two systems are presented in comparison, one of which, Co<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub>, showed soft magnetic properties, and the second, (CoFeZr)<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub>, hard magnetic properties, during the transition from the superparamagnetic to the ferromagnetic state. Moreover, for the first time, the concentration dependences of the oscillating fine structure of XANES K-absorption edges of Co atoms in the first system and Co and Fe atoms in the second system are presented, which undergo changes at the percolation thresholds in each of the two systems and thus confirm the nonlinear nature of the electromagnetic properties changes in each of the two systems at the atomic level. |
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| institution | Kabale University |
| issn | 2079-4991 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | MDPI AG |
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| series | Nanomaterials |
| spelling | doaj-art-7ccd2e14f45b46669d6eb799b7af468c2025-08-20T03:43:31ZengMDPI AGNanomaterials2079-49912025-03-0115646310.3390/nano15060463Feature of Nonlinear Electromagnetic Properties and Local Atomic Structure of Metals in Two Systems of Nanocomposites Co<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub> and (CoFeZr)<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub>Evelina Pavlovna Domashevskaya0Sergey Alexandrovich Ivkov1Elena Alexandrovna Ganshina2Lyubov Vladimirovna Guda3Valeriy Grigoryevich Vlasenko4Alexander Victorovich Sitnikov5Department of Solid-State Physics and Nanostructures, Voronezh State University, Universitetskaya pl., 1, 394018 Voronezh, RussiaDepartment of Solid-State Physics and Nanostructures, Voronezh State University, Universitetskaya pl., 1, 394018 Voronezh, RussiaDepartment of Magnetism, Faculty of Physics, Lomonosov Moscow State University, Leninskiye Gory B 1-2, GSP-1, 119991 Moscow, RussiaThe Smart Materials Research Institute, South Federal University, St. Sorge, 5, 344090 Rostov-on-Don, RussiaThe Smart Materials Research Institute, South Federal University, St. Sorge, 5, 344090 Rostov-on-Don, RussiaDepartment of Solid State Physics, Faculty of Radio Engineering and Electronics, Voronezh State Technical University, Moskovsky pr., 14, 394026 Voronezh, RussiaBased on modern concepts of the nonlinear percolation mechanisms of electrical and magnetic properties in granular metal–dielectric nanocomposites, the authors present for the first time a comparative analysis of their own results of a comprehensive study of nonlinear electromagnetic properties in two nanocomposite systems: metal–dielectric Co<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub> and alloy–dielectric (CoFeZr)<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub>, obtained by ion-beam sputtering of composite targets in a wide range of different compositions. For the first time, the features of the influence of atomic composition and structural-phase transitions on nonlinear magnetoresistive, magnetic, and magneto-optical properties in two systems are presented in comparison, one of which, Co<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub>, showed soft magnetic properties, and the second, (CoFeZr)<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub>, hard magnetic properties, during the transition from the superparamagnetic to the ferromagnetic state. Moreover, for the first time, the concentration dependences of the oscillating fine structure of XANES K-absorption edges of Co atoms in the first system and Co and Fe atoms in the second system are presented, which undergo changes at the percolation thresholds in each of the two systems and thus confirm the nonlinear nature of the electromagnetic properties changes in each of the two systems at the atomic level.https://www.mdpi.com/2079-4991/15/6/463metal–dielectric and alloy–dielectric nanocompositesnanocrystalsphase transformationspercolation thresholdnonlinear propertiessoft and hard magnetic materials |
| spellingShingle | Evelina Pavlovna Domashevskaya Sergey Alexandrovich Ivkov Elena Alexandrovna Ganshina Lyubov Vladimirovna Guda Valeriy Grigoryevich Vlasenko Alexander Victorovich Sitnikov Feature of Nonlinear Electromagnetic Properties and Local Atomic Structure of Metals in Two Systems of Nanocomposites Co<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub> and (CoFeZr)<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub> Nanomaterials metal–dielectric and alloy–dielectric nanocomposites nanocrystals phase transformations percolation threshold nonlinear properties soft and hard magnetic materials |
| title | Feature of Nonlinear Electromagnetic Properties and Local Atomic Structure of Metals in Two Systems of Nanocomposites Co<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub> and (CoFeZr)<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub> |
| title_full | Feature of Nonlinear Electromagnetic Properties and Local Atomic Structure of Metals in Two Systems of Nanocomposites Co<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub> and (CoFeZr)<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub> |
| title_fullStr | Feature of Nonlinear Electromagnetic Properties and Local Atomic Structure of Metals in Two Systems of Nanocomposites Co<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub> and (CoFeZr)<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub> |
| title_full_unstemmed | Feature of Nonlinear Electromagnetic Properties and Local Atomic Structure of Metals in Two Systems of Nanocomposites Co<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub> and (CoFeZr)<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub> |
| title_short | Feature of Nonlinear Electromagnetic Properties and Local Atomic Structure of Metals in Two Systems of Nanocomposites Co<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub> and (CoFeZr)<sub>x</sub>(MgF<sub>2</sub>)<sub>100−x</sub> |
| title_sort | feature of nonlinear electromagnetic properties and local atomic structure of metals in two systems of nanocomposites co sub x sub mgf sub 2 sub sub 100 x sub and cofezr sub x sub mgf sub 2 sub sub 100 x sub |
| topic | metal–dielectric and alloy–dielectric nanocomposites nanocrystals phase transformations percolation threshold nonlinear properties soft and hard magnetic materials |
| url | https://www.mdpi.com/2079-4991/15/6/463 |
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