Prof. Vladimir Kostishin
National University of Science and Technology “MISIS”, Moscow, Russia
Title: Electromagnetic and radio‑absorbing properties of polycrystalline spinel- ferrites
Abstract:
The paper studies, presents, and analyzes the electromagnetic (complex dielectric permittivity, complex magnetic permeability) and radio‑absorbing (reflection coefficient on a metal plate) properties of polycrystalline spinel ferrites NiZn-, MnZn-, MgMnZn-, and LiMnZn- in the frequency range of 0.001–7.0 GHz.
The samples of polycrystalline spinel ferrites were produced using ceramic technology. The preparation of the ferrite charge was carred out using pure starting components (oxides) containing an amount of the basic substance of more than 99.6 % by mass. To measure the complex dielectric permittivity, complex magnetic permeability, and reflection coefficient on a metal plate, a Rohde&Schwarz ZVL‑13 vector network analyzer and the CELL‑2 software package were used. The values of the dielectric constant ε* and magnetic permeability μ* were studied using the Nicholson–Ross–Weir method through a comprehensive analysis of phase angles and dimensionless S‑parameters (S11, S12, S22, S21).
It has been established that NiZn‑ and LiMnZn‑ferrite‑spinels are good radio‑absorbing materials. The maximum losses due to the absorption of electromagnetic waves for these ferrites, with a sample thickness of 5.0–6.0 mm, reach – (20 ÷ 25) dB. The active mechanisms of electromagnetic wave absorption in the studied ferrites are discussed. The prospects for the actual application of the studied ferrites as radio‑absorbing and radio‑shielding materials are considered and analysed.
Biography:
Vladimir Kostishin was born on July 2, 1961, in the Ivano Frankivsk Oblast, Ukrainian SSR. In June 1983, he graduated from the Faculty of Physics at Lviv State University named after I. Franko with a degree in radiophysics and electronics, specializing in radio electronic materials science. From December 1985 to December 1988, he studied in the postgraduate program at the Moscow Institute of Steel and Alloys (now the National Research Technological University “MISIS”).
- In December 1995, he defended his candidate’s dissertation on the topic “Modification of the properties of epitaxial single crystal films of garnet ferrites under the influence of Co60 gamma quanta.” - In January 1998, he was awarded the academic title of associate professor.
- In December 2009, he defended his doctoral dissertation in physical and mathematical sciences on the topic “Radiation stimulated and corona electret changes in the structure and properties of ferrogranate heterocompositions.”
- In 2015, he was awarded the academic title of “professor.”
- In October 2016, he was elected a corresponding member of the Academy of Engineering Sciences of the Russian Federation named after A. M. Prokhorov.
- December 2021 — elected a full member of the Academy of Engineering Sciences of the Russian Federation named after A. M. Prokhorov.
- From December 2009 to the present — head of the Department of Electronic Materials Technology at the National Research Technological University “MISIS”, Moscow, Russia.
- From April 2022 to the present — scientific supervisor of the “Laboratory of Intelligent Service Systems” on a part time basis.
Research interests: physics and technology of ferrite materials and devices; radio absorbing ferrites and composites based on them; magnetic films; magnonics.
Bibliometric data: ORCID — 0000-0001-5384-6331; Researcher ID in Web of Science: HJP-5354-2023; Scopus ID: 6603101830. Hirsch index: Scopus — 39, Web of Science — 39; author of more than 470 publications in peer reviewed scientific journals.
Under the scientific supervision of Prof. V.G. Kostishin, 14 candidate dissertations were prepared and defended.
Prof. V.G. Kostishin was the scientific supervisor for 14 research grants.