Ferromagnetic resonance of nonstoichiometric zinc ferrite and cobalt-doped zinc ferrite nanoparticles |
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| Institution: | 1. C.E.A.- C.E. Saclay, DRECAM-S.C.M, 91191 Gif sur Yvette, Cedex, France;2. Laboratoire SRSI, URA CNRS 1662, Universite P et M Curie, (Paris VI), BP 52, 4 Place Jussieu, 75231 Paris cedex 05, France;1. UGC-DAE Consortium for Scientific Research Mumbai Centre, BARC Campus, Trombay, Mumbai 400085, India;2. UGC-DAE Consortium for Scientific Research, Indore Centre, University Campus, Khandwa Road, Indore 452001, India;1. Ceramic Composite Laboratory, Centre for Crystal Growth, SAS, VIT University, Vellore 632014, Tamil Nadu, India;2. IFW, Leibniz Institute for Solid State and Materials Research, Technische Universität Dresden, 01069 Dresden, Germany;1. Materials R&D Center, Samsung Advanced Institute of Technology, Samsung Electronics, 16677 Suwon, Republic of Korea;2. Department of Materials Science and Engineering, Myongji University, 17058 Yongin, Republic of Korea;3. Department of Materials Science & Engineering, Korea National University of Transportation, 27469 Chungju, Republic of Korea;1. School of Physics and Materials Science, Thapar University Patiala, 147004, Punjab, India;2. Departamento de Física, Universidade Estadual de Maringá, Av. Colombo, 5790, Maringá, Brazil |
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| Abstract: | Ferromagnetic resonance spectra of zinc ferrite and cobalt doped zinc ferrite nanoparticles, measured at various temperatures, exhibit an invariant point at a given field. This makes it possible to determine the equation relating the resonance field shift to the peak-to-peak linewidth. When particles are frozen in a matrix in a magnetic field, the anisotropy constant of the material can be derived from the angular variation of the resonance field. This procedure is useful to determine the thermal dependence of the anisotropy constant, but is shown to require various freezing temperatures experiments to estimate the accuracy of the deduced anisotropy constant values. It is also shown that the angular dependence of the resonance field is similar for a uniaxial (zinc ferrite) and cubic (zinc ferrite containing 40% cobalt ions) anisotropy. This unexpected result is explained by the weakness of the texturation, leading to a distribution in easy axes directions. |
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