Magnetic and dielectric properties of solid solutions (1–x)BiFeO3–xYMnO3 multiferroics

Abstract

The magnetic hysteresis loops in fields ranging from 0 to ± 2.5 kOe and the dielectric permittivity ɛ (measured at 1 kHz, 1 MHz, and 8.3 GHz) of composite multiferroic materials (1–х)BiFeO3–xYMnO3 (0 ≤ x ≤ 0,5) have been studied. Ceramic solid solution samples were prepared using nitrate technology. It was found that the (1–x)BiFeO3–xYMnO3 (0.1 < x < 0.5) compounds are magnetically soft ferromagnetic materials that are sensitive to weak magnetic fields. The coercive field Hc is ∼20–32 Oe. Maximum magnetization was observed for samples with х = 0.35. For samples with 0 ≤ x ≤ 0.4 at Т = 300 K and a frequency of 1 kHz, ɛ ∼17.6–248.6, at a frequency of 1 MHz ɛ ∼7.8–63.2, and at a frequency of 8.3 GHz, ɛ ∼4 ± 0.3.