The spontaneous exchange bias effect in La2−𝑥Ca𝑥CoMnO6 series
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Data
2022
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Resumo
Structural, electronic and magnetic properties of polycrystalline La2−𝑥Ca𝑥CoMnO6
(0 ≤ 𝑥 ≤ 0.75) compounds
are investigated by x-ray diffraction and magnetometry. All the samples have an orthorhombic structure and
show a slight decrease in the unit cell with Ca-doping. Temperature-dependent magnetization measurements
reveal a complex magnetic behavior with two ferromagnetic transitions. These transitions are ascribed to
Co2+–Mn4+ and Co3+–Mn3+ couplings and suggest the presence of additional antiferromagnetic couplings
in these disordered compounds. Field-dependent magnetization curves, measured after cooling the samples
in a zero external magnetic field, reveal the spontaneous exchange bias (SEB) effect for the Ca-doped
samples. The strengthening of the uncompensated magnetic coupling at the interfaces, caused by the increased
antiferromagnetic phase, explains the increase of SEB with increasing the Ca-content
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Double-perovskite, Cobalt, Manganese, Exchange bias
Citação
JESUS, J. R.; BUFAIÇAL, L ; BITTAR, E. M. The spontaneous exchange bias effect in La2−𝑥Ca𝑥CoMnO6 series. Journal of Magnetism and Magnetic Materials, Amsterdam, v. 556, e169402, 2022. DOI: 10.1016/j.jmmm.2022.169402. Disponível em: https://www.sciencedirect.com/science/article/pii/S0304885322003377. Acesso em: 16 fev. 2024.