Electromagnetism and magnetization in granular two-phase nanocomposites: A comparative microwave study
| Autor: | Stéphane Mallégol, Jamal Ben Youssef, Christian Brosseau, Patrick Queffelec |
|---|---|
| Přispěvatelé: | Laboratoire d'Electronique et Systèmes de Télécommunications (LEST), Université de Brest (UBO)-Ecole Nationale Supérieure des Télécommunications de Bretagne-Centre National de la Recherche Scientifique (CNRS), Laboratoire des sciences et techniques de l'information, de la communication et de la connaissance (Lab-STICC), Institut Mines-Télécom [Paris] (IMT)-IMT Atlantique Bretagne-Pays de la Loire (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-École Nationale d'Ingénieurs de Brest (ENIB)-École Nationale Supérieure de Techniques Avancées Bretagne (ENSTA Bretagne)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Université Bretagne Loire (UBL), Laboratoire de magnétisme de Bretagne (LMB), Université de Brest (UBO)-Institut Brestois du Numérique et des Mathématiques (IBNM), Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS), Queffelec, Patrick |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
010302 applied physics
[PHYS]Physics [physics] Materials science Condensed matter physics [SPI] Engineering Sciences [physics] Metallurgy General Physics and Astronomy Nanoparticle Coercivity 01 natural sciences [SPI]Engineering Sciences [physics] Magnetic anisotropy Magnetization Ferromagnetism Phase (matter) 0103 physical sciences [PHYS.COND]Physics [physics]/Condensed Matter [cond-mat] 010306 general physics Relative permeability Microwave ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Journal of Applied Physics Journal of Applied Physics, American Institute of Physics, 2007, 101 (3), pp.034301 Journal of Applied Physics, American Institute of Physics, 2007, 101 |
| ISSN: | 0021-8979 1089-7550 |
| Popis: | Cold-pressed powder compacts in our experiments were prepared from commercial nanopowders of ZnO, Ni, Co and γ‐Fe2O3. A systematic study of the room temperature effective permeability tensor of composite samples made of these nanophases is performed and provides a signature for the nonreciprocity of wave propagation in these nanostructures. Our measurements which cover a broad range of frequency in the microwave region provide a wealth of information leading to a much better understanding of the electromagnetic wave transport in nanogranular materials throughout this frequency range. We report our observations on the frequency and composition dependences of the permeability tensor components of a large set of nanocomposites (NCs) at different magnetic fields. It is found that mixing Ni nanoparticles with ZnO nanoparticles results in a smaller linewidth of the gyromagnetic resonance and an increased coercivity compared to a sample consisting solely of Ni nanoparticles. On the contrary, mixing of Co nanopar... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|