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• W3041078229 abstract "Magnetoeletric multiferroism – a coexistence of ferroeletricity and magnetic order in the same phase is a phenomenal and rarely occurring physical property in condensed matter systems. Controlling the electric polarization by applied magnetic fields and controlling the magnetic order by applied electric fields in such multiferroics systems holds a promise for fabrication of multiple-state memory devices [1-3]. The BiFeO3 show room temperature multiferroism; in these compounds puts another constraint on their realization in device application. The ferroelectric Curie temperature at ~1100K and Neel’s ordering at ~640K in BiFeO3 make this compound an obvious choice for studying fundamental aspects and tailoring its properties for the device applications [1]. Bulk BiFeO3 (BFO) crystallizes in rhomobohedral structure in hexagonal settings with cell parameters as a=b=5.65A, and c=13.68 A and if represented in pseudocubic form has the lattice constants as a=3.96A, a=0.6°. In this compound, the ferroelectric polarization and G-type antiferromagnetic (AFM) structure manifest along (111) crystallographic direction [1]. Recently, the observation of large ferroelectric polarization and weak ferromagnetism in thin films vis-a-vis almost 1-2 orders of magnitude smaller polarization in bulk form, has triggered a great deal of research in thin films of this compound. This was realized by Wang et al. [4] when they observed large values of magnetic moment (~1μB/Fe ion) and ferroelectric polarizations (~60 μC/cm) in thin films deposited on SrTiO3 (100) [STO] substrate with SrRuO3 as buffer layer; and the thickness dependence of multiferroism is attributed to the hetero-epitaxial strain. On the contrary, Eerenstein et al. [5] did not observe any thickness dependence of magnetic properties in the films deposited on STO with and without SrRuO3 buffer layer. These inconsistent and indecisive conclusions of the role of epitaxial/hetero-epitaxial strain on the enhancement of magnetic moment continued to attract further attention. The studies that followed attributed the occurrence of ferromagnetic-like moment to two extrinsic factors, namely, the oxygen deficiencies [6] and the presence of a parasitic magnetic phase [7] γ-Fe2O3. Furthermore, there is no agreement between theory and experiments for strain induced magnetic moment in thin films. The theory predicts that the polar displacements cannot enhance the magnetic moment; and if any enhancement in magnetization arises, it could be a result of different mechanism [8]. Subsequently, the role of epitaxial strain on magnetism, though small, could not be ratified experimentally. Realization of fully strained films on a substrate with larger lattice misfit could be a key factor to determine the effect of epitaxial strain on magnetism. The (LaAlO3)0.3(Sr2AlTaO6)0.7 (001) [LSAT] (a=3.868 A) is one such substrate which has substantially large lattice misfit of ~3% with BFO (a=3.96 A) as compared that to ~2% misfit of STO (a=3.906 A) with BFO. This large lattice misfit of LSAT with BFO is an important prerequisite for elucidating the effect of epitaxial strain on structure and magnetism. With this perspective, we have deposited varying thickness phase-pure BiFeO3 films – ranging from 40 nm to 500nm on LSAT (001) substrates and examined the possible correlation between the structural and magnetic properties. In this communication, it is shown that with increasing thickness the BFO films on LSAT (001) substrate exhibit multiple structural phase transitions from a fully strained pseudomorphic tetragonal phase in films = 75 nm to a mixed phase of fully and partially strained structure in the range of 80-110 nm to a bulk-like rhombohedral phase in films with a thickness of 200-500 nm. Most significantly, we show that weakly enhanced magnetic moment manifests in fully strained films and that there exists a direct correlation between the structure and the magnetization of these films." @default.
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• W3041078229 date "2007-01-01" @default.
• W3041078229 modified "2023-09-27" @default.
• W3041078229 title "Thickness dependence of structure and magnetization of BiFeO3 thin films on (LaAlO3)0.3(Sr2AlTaO6)0.7 (001) substrate" @default.
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