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Telecommunications and Radio Engineering
SJR: 0.202 SNIP: 0.2 CiteScore™: 0.23

ISSN Imprimer: 0040-2508
ISSN En ligne: 1943-6009

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v77.i7.50
pages 627-633

THICKNESS DEPENDENCES OF HIGH-FREQUENCY MAGNETIC HYSTERESIS PROPERTIES IN SINGLE-CRYSTAL BARIUM HEXAFERRITE

A. L. Nikytenko
Taras Shevchenko National University of Kyiv, 60 Volodymyrska St, Kyiv 01033, Ukraine
V. I. Kostenko
Taras Shevchenko National University of Kyiv, 60 Volodymyrska St, Kyiv 01033, Ukraine
V. I. Grygoruk
Taras Shevchenko National University of Kyiv, 60 Volodymyrska St, Kyiv 01033, Ukraine
V. F. Romaniuk
Taras Shevchenko National University of Kyiv, 60 Volodymyrska St, Kyiv 01033, Ukraine

RÉSUMÉ

The properties of hysteresis of ferro-magnetic resonance frequency-field dependence of barium-hexaferrite samples have been the subject for study. The main objective is to investigate experimentally features of high-frequency magnetic hysteresis in a wide range of thickness of samples.
The experimental investigation has been carried out using the EHF-spectroscopy technique. In order to obtain a cylindrical domain structure the field method is used.
It has been found that in thick samples (more than 100 μm) the transition to a saturated (single-domain) state occurs at lower values of the external magnetic field Hs, moreover, the thickness dependence of this field is close to the linear one. Furthermore, a similar dependence is observed for the field Hbr, when the sample turns into a multi-domain state. At the same time, there is no a clear dependence of the hysteresis value as the thickness of the samples changes.
The shift of the frequency-field dependence of the ferromagnetic resonance into the high-frequency region under the saturated state of thick barium-hexaferrite samples is observed. It has been found that each sample can be characterized by some average value of hysteresis, which is different from the others.


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