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Multiferroic and magnetoelectric nature of GaFeO3, AlFeO3 and related oxides

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arxiv 1112.5848 v2 pith:5Y3CYGGY submitted 2011-12-26 cond-mat.mtrl-sci

Rana Saha , Ajmala Shireen , Sharmila N. Shirodkar , Umesh V. Waghmare , A. Sundaresan , C. N. R. Rao This is my paper
classification cond-mat.mtrl-sci
keywords oxidesferroelectricityalfeo3carryingeffectgafeo3magnetoelectricmeasurements
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GaFeO3, AlFeO3 and related oxides are ferrimagnetic exhibiting magnetodielectric effect. There has been no evidence to date for ferroelectricity and hence multiferroicity in these oxides. We have investigated these oxides as well as oxides of the composition Al1-x-yGaxFe1+yO3 (x = 0.2, y = 0.2) for possible ferroelectricity by carrying out pyroelectric measurements. These measurements establish the occurrence of ferroelectricity at low temperatures below the N\`eel temperature in these oxides. They also exhibit significant magnetoelectric effect. We have tried to understand the origin of ferroelectricity based on non-centrosymmetric magnetic ordering and disorder by carrying out first-principles calculations.

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