Magnetoelectric coupling in two-phase magnetocaloric composites
Abstract
Magnetic refrigeration is an efficient technology with low environmental impact. An economical material is La0.7Ca0.3MnO3 (LCM), but with a Curie temperature lower than ambient and a narrow working range. It is proposed to use two-phase magnetocalorics from mixtures of lanthanum manganites LCM doped with 0.2 mol of Cr and LCM doped with 0.1 mol of Sr, in 50-50 weight proportions. The presence of two phases, Pbnm and R3c, was confirmed by X-ray diffraction. Ferromagnetic order at room temperature was confirmed by vibrating sample magnetometry. The electrical characterization showed relative permittivity values between 1013 and 105 in a frequency range from 102 to 5x106 Hz and dielectric losses between 103 and 1, having a semiconductor behavior. With a magnetoelectric coupling of magnetoresistances up to 3%.
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