Coaxial measurements of microwave permeability of thin supermalloy films under magnetic bias

Shiryaev, Artem O.; Bobrovskii, Stanislav Y.; Granovsky, A. B.; Осипов, А. В.; Naboko, Andrei S.; Lähderanta, E.; Lagarkov, A. N.; Rozanov, Konstantin N.; Zezyulina, Polina A.

doi:10.1016/j.jmmm.2019.01.055

Cited by 3 publications

(1 citation statement)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The technique proposed in [17,18] may be used to study demagnetization effects, to interpret the magnetic loss peaks, and to determine the saturation magnetization. The technique represents the coaxial measurements of complex permeability depending both on frequency, f, and on external field, H: µ(f, H) = Re[µ (f, H)] + i•Im[µ(f, H)].…”

Section: Introductionmentioning

confidence: 99%

Splitting of the Magnetic Loss Peak of Composites under External Magnetic Field

Shiryaev

Rozanov

Naboko

et al. 2021

Physics

View full text Add to dashboard Cite

Composite materials filled with ferromagnetic inclusions are useful in the development of various microwave devices. The performance of such devices is determined both by material properties (such as the saturation magnetization and the permeability) and by the demagnetization effects. The paper is devoted to the study of the demagnetization effect on the permeability measurements of composites under external magnetic bias. The microwave permeability of composites filled with flake sendust (Fe-Si-Al alloy) particles is measured as a function of frequency and the external magnetic field. The measurements are carried out by the Nicolson–Ross–Weir technique in a 7/3 coaxial line in the frequency range of 0.1 to 20 GHz by a vector network analyzer. It is found that the magnetic loss peak is split under external fields of more than 1.5 kOe. The main aim of this paper is to study the causes of this splitting and to interpret the observed magnetic loss peaks. To study this effect, the samples of various thicknesses and the samples with isotropic and anisotropic orientations of particles are measured. The particles in the anisotropic samples are oriented by a strong uniform magnetic field. At a small fraction of inclusions, the permanent magnetic field is demagnetized on the individual particles rather than the whole sample. The splitting of the magnetic loss peak of the isotropic sample is caused by different orientations of particles in the sample. At a high fraction of inclusions, the permanent magnetic field is demagnetized on the whole sample and the magnetic loss peak of the isotropic sample is not split. The saturation magnetization of the material is found by measurements under the external magnetic field of the anisotropic sample.

show abstract

Section: Introductionmentioning

confidence: 99%