Investigations of surface spin canting in Ni-Zn nanoferrite and its development as magnetic core for microwave applications

•Achieved high saturation magnetization of 80.3 emu/gm for a crystallite size of 42 nm.•Low surface spin canting angle observed is the cause for such high magnetization.•Initial permeability dispersion shows that the material would be suitable as magnetic core up to 18 GHz. Nanoparticles of nickel z...

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Bibliographic Details
Published inJournal of magnetism and magnetic materials Vol. 471; pp. 262 - 266
Main Authors Kumar, A. Mahesh, Rao, K. Srinivasa, Varma, M. Chaitanya, Rao, K.H.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 01.02.2019
Elsevier BV
Subjects
Annealing
Canting angle
Crystallites
Dependence
Electrical resistivity
Electron micrographs
Ferrite
Low temperature physics
Magnetic cores
Magnetic permeability
Magnetic saturation
Magnetism
Magnetization
Microwaves
Nanoparticles
Nickel
Particle shape
Permeability
Permeability and frequency dispersion
Sol-gel processes
Zinc
Canting angle
Permeability and frequency dispersion
Ferrite
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Summary:•Achieved high saturation magnetization of 80.3 emu/gm for a crystallite size of 42 nm.•Low surface spin canting angle observed is the cause for such high magnetization.•Initial permeability dispersion shows that the material would be suitable as magnetic core up to 18 GHz. Nanoparticles of nickel zinc ferrite Ni0.65Zn0.35Fe2O4 having an average crystallite size of 42 nm, synthesized by sol–gel method were found to exhibit the highest value of saturation magnetization along with high dc resistivity. The observed variations in saturation magnetization and crystallite size as a function of annealing temperature were elucidated considering the core surface magnetic interactions and the particle shape of the nanoferrite using low temperature in-field Mössbauer measurements and the high-resolution transmission electron micrographs. With the attainment of valuable magnetization and resistivity, the usefulness of the material as magnetic core for high frequency applications has been investigated by studying the frequency dependence of initial permeability. Interestingly, the results support that the material would be suitable as magnetic core up to 18 GHz.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2018.09.060