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Synthesis and magnetic properties of polycrystalline films of Co$_x$Fe$_y$Cr$_{3-x-y}$O$_4$ and Cr$_2$O$_3$/CoFe$_2$O$_4$ multiferroics

K. P. Polyakova^ab, V. V. Polyakov^ab, D. A. Velikanov^ab, G. Yu. Yurkin^ab, G. S. Patrin<sup>ab

a</sup> L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
^b Siberian Federal University, Krasnoyarsk

Abstract: Magnetic properties of first obtained polycrystalline films of FeCr$_2$O$_4$, CoCr$_2$O$_4$, and CoFe$_{0.5}$Cr$_{1.5}$O$_4$ multiferroics and films of a Cr$_2$O$_3$/CoFe$_2$O$_4$ composite multiferroic have been studied. In particular, magnetization curves and temperature dependences of the magnetic moment of the samples were measured in the temperature range 4.2–300 K in fields of up to 10 kOe. It was shown that the Curie point of a multiferroic depends on its cation composition. It was found that an exchange bias of the hysteresis loop exists in films of the Cr$_2$O$_3$/CoFe$_2$O$_4$ composite multiferroic at temperatures below the Néel point of Cr$_2$O$_3$ (330 K).

Received: 13.03.2014

 English version: Technical Physics Letters, 2014, 40:8, 632–635

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