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Magneto-dielectric Effect in Relaxor Dipolar Glassy Tb2CoMnO6 Film | | R. Mandal
; M. Chandra
; V. Roddatis
; M.Tripathi
; R. Rawat
; R.J.Choudhary
; V. Moshnyaga
; | | Date: |
17 Oct 2019 | | Abstract: | We report magneto-dielectric properties of partially B-site ordered
monoclinic Tb2CoMnO6 double perovskite thin film epitaxially grown by
metalorganic aerosol deposition technique. Transmission electron microscopy and
electron energy loss spectroscopy mapping shows the presence and distribution
of both Co2+ and Co3+ ions in the film, evidencing a partial B-site disorder,
which was further confirmed by the observation of reduced saturation
magnetization at low temperatures. The ferromagnetic Curie temperature, TC=110
K, is slightly higher as compared to the bulk value (100 K) probably due to an
in plane tensile strain. Remarkably, a short range ordering of spins at T*~190
K>>TC was established and assigned to the B-site disorder in the film. Two
different dielectric relaxation peaks have been observed; they merge at the
same temperature T* of short range spin correlations. Moreover, an unexpected
high temperature dipolar relaxor-glass-like transition at T~T* was observed, at
which a coupling to short range magnetic correlations results in a 4%
magneto-dielectric coupling. | | Source: | arXiv, 1910.7991 | | Services: | Forum | Review | PDF | Favorites | |
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