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Ferromagnetism, structure transitions, and strain coupling of magnetoelastic double perovskite La2CoMnO6

Yang, Dexin, Yang, Tao, Chen, Yulong, Liang, Yu, Liu, Yan’gai
Journal of materials science 2019 v.54 no.8 pp. 6027-6037
X-ray diffraction, crystal structure, differential scanning calorimetry, electronics, engineering, ferrimagnetic materials, ferromagnetism, microstructure, oxygen, scanning electron microscopy
Double perovskite La₂CoMnO₆ is an attractive spintronics with magnetoelectric, magnetodielectric, and magnetoresistive effects, which are related, at least in part, to combined structural and magnetic instabilities. To explore its magnetoelastic coupling behaviour, a conventional analysis of lattice parameter data in terms of spontaneous strain shows that the ferromagnetic ordering process is accompanied by significant volume (eₐM) and shear (eₜM) strains. The DC and AC magnetic data reveal the antisite defects with antiphase regions, and the ferromagnetic transition is at ~ 230 K with a small antiferromagnetic ordering at about 170 K. In addition, the Rietveld refinement of the in situ variation X-ray diffraction from 120 to 1400 K, scanning electron microscopy, and differential scanning calorimetry were used to confirm the crystal structure, microstructure, magnetic, and structural anomalies of the sample synthesised in pure oxygen atmosphere. This study, and in particular the strain analysis, of La₂CoMnO₆ will facilitate its potential application in the field of spin electronics and thin-film engineering.