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Федеральный исследовательский центр 
«Красноярский научный центр
Сибирского отделения Российской академии наук»

Magnetodielectric effect in a metamaterial consisting of xerogel with embedded epsilon-Fe2O3 iron oxide nanoparticles

2019 год

Авторы
Kirillov, V. L.
Boreskov Institute of Catalysis, Novosibirsk, Russian Federation
Krasikov, A. A.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Russian Acad Sci, Siberian Branch, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Dubrovskiy, A. A.
International Laboratory of High Magnetic Fields and Low Temperatures, Wroclaw, Poland
Kirensky Institute of Physics, Krasnoyarsk, Russian Federation
Martyanov, O. N.
Boreskov Institute of Catalysis, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Lavrentieva 5, Novosibirsk, Russian Federation
Balaev, D. A.
SB RAS, Kirensky Inst Phys, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
The epsilon-Fe2O3 iron oxide is a fairly rare polymorphic modification, which only exists in the form of nanoparticles embedded, as a rule, into a silica gel matrix. This magnetically ordered iron oxide, which exhibits a significant room-temperature coercivity, is a ferroelectric; therefore, the magnetoelectric and magnetodielectric properties of this material evoke keen interest. In this work, we investigate the magnetodielectric (MD) effect in a metamaterial consisting of xerogel SiO2 with embedded epsilon-Fe2O3 nanoparticles 9 nm in size on average in a concentration of 20 mass.%. This bulk material exhibits the MD effect in a wide temperature range. The temperature behavior of the permittivity is related to the magnetic state of the epsilon-Fe2O3 oxide, which undergoes the magnetic transition from the magnetically hard to magnetically soft phase in the temperature range of 80-150 K, indicating the interplay of the epsilon-Fe2O3 magnetic and charge subsystems.


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