Abstract
Abstract Nano particles of BiFeO3 and BiFe0.98Co0.02O3 are studied via neutron diffraction technique. Analysis of purely magnetic peak near d ~ 4.56 A, reveals large spin canting and anharmonic cycloidal magnetic structure i.e., bunching of the magnetic moment along c-axis at 300K. This is in contrary to that observed in bulk, where the spins are restricted to ab-plane only. The substitution of Co3+ is found to be inducing more spin canting. On decreasing the temperature, magnetic anharmonicity decreases and the magnetic cycloidal structure revives. At room temperature, the Co3+ are found to be in intermediate spin state corresponding to magnetic moment 2.828 μB, whereas that of Fe3+ as 3.848 μB. At low temperatures, signature of spin state transition from intermediate spin (S =1) to low spin (S = 0) of Co3+ ion is observed.
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