Abstract
Abstract Double perovskite La 2 Co 1−x Fe x MnO 6 (x = 0.1, 0.2, 0.5, 1.0) ceramic samples were synthesized by the standard solid-state reaction method. The powder x-ray diffraction (Cu- Kα ) results confirm that this type of compounds has orthorhombic perovskite structure with space group of Pbnm at room temperature. The exchange bias can be observed in all samples. The random distribution of the Fe 3+ ions increases the disorder in La 2 Co 1−x Fe x MnO 6 system, which leads the decreasing of Curie temperature, coercive field, saturation magnetization and remanent magnetization. Griffiths phase may exist below certain temperature in La 2 Co 1−x Fe x MnO 6 samples. The electrical resistivity of La 2 Co 1−x Fe x MnO 6 exhibits obvious semiconducting-like behavior, while the conduction model gradually changed from 3-dimensional variable range hopping model to thermal activation model with the increasing of Fe 3+ -substitution. The negative magnetoresistance effects observed in all samples may be suppressed by Fe 3+ -substitution.
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