Ferromagnetism, structure transitions, and strain coupling of magnetoelastic double perovskite La2CoMnO6
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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.
This work is financially supported by the National Natural Science Foundation of China (Grant No. 51702289) and the China Postdoctoral Science Foundation (Grant No. 2016M601963). T. Yang would like to acknowledge financial support from Engineering Research Center of non-metallic minerals of Zhejiang Province, Key Laboratory of Clay Minerals, Ministry of Land and Resources.
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Conflict of interest
The authors declare that they have no conflict of interest.
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