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- W2076256987 abstract "This study investigates the magnetocrystalline anisotropy constants (K1) and the saturation magnetostriction constants (λS) of Ni1−xZnxFe2O4 (NiZn) and Ni0.8−xZnxCo0.2Fe1.98O4−δ (NiZnCo) ferrites intended to be used for antenna downsizing. Composite materials constituted of soft ferrite nanosized particles (NiZn or NiZnCo ferrites) embedded in an epoxy matrix are realized. Measurements of their magnetic permeability in the frequency range of 200 MHz–6 GHz are performed. The influence of compressive stress (in the range of 32–96 MPa) on their Ferrimagnetic Resonance (FMR) is demonstrated. An analytical modeling of stress-induced FMR changes is proposed that allows simultaneous determinations of the Natural Ferrimagnetic Resonance (NFMR, F0), K1 and λS of Ni1−xZnxFe2O4 and Ni0.8−xZnxCo0.2Fe1.98O4−δ ferrites. The obtained results for NiZn ferrites are in agreement with literature data, validating both the experimental process and the proposed modeling of the stress-induced FMR changes. Regarding NiZnCo ferrites, extended data on K1 and λS are presented for the first time. Increasing zinc content (x) induces a spin disorder that reduces in a same time K1 and the magnetization at saturation MS. The rapid variation of K1(x) is related to that of the magnetization MS(x) through a power law. The single-ion anisotropy model allows a satisfactory interpretation of K1 dependence on zinc content. The unexpected low values of λS got for NiZnCo ferrites, compared to those got for NiZn ferrites, are also discussed. Application of compressive stress lowers noticeably magnetic losses of Ni0.6Zn0.2Co0.2Fe1.98O4−δ at given frequency, thereby enhancing the ability of this spinel ferrite to be used as a substrate in the aim of antenna miniaturization." @default.
- W2076256987 created "2016-06-24" @default.
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- W2076256987 date "2015-01-01" @default.
- W2076256987 modified "2023-10-16" @default.
- W2076256987 title "Experimental determination of magnetocrystalline anisotropy constants and saturation magnetostriction constants of NiZn and NiZnCo ferrites intended to be used for antennas miniaturization" @default.
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- W2076256987 doi "https://doi.org/10.1016/j.jmmm.2014.09.026" @default.
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