Abstract
In the quest for deriving new multiferroics from the existing ones, we have prepared and studied polycrystalline Bi2(1-x)Ho2xFe4O9 (0 ≤ x ≤ 0.02) ceramics. A substantial increase in the Néel temperature (TN) from 250 K (x = 0, BFO) to 266 K (x = 0.02, BHFO2) is observed for Ho-substituted samples. The magnetization measurements suggest that Ho3+ goes as isolated magnetic defects and interaction among them is reflected only when the temperature goes below 70 K. Interestingly, the Néel temperature is not clearly visible in the magnetization-temperature plot due to its masking by the high moment of isolated Ho3+ ions, but TN is very clearly reflected in the dielectric plot, thus indicating a plausible coupling between the magnetic and electric order parameters. Also, a dielectric crossover at T ∼ 200 K is observed for Ho3+ substituted samples and explained using a mean-field approximation model, thereby validating the presence of isolated defects arising due to Ho3+ substitution. At the same time, an enhanced magnetodielectric (MD) effect at 200 K i.e., ∼−1.6% (∼530 times) for BHFO2 is discerned as compared to BFO. Furthermore, confirmation to this coupling is drawn from MD% versus T plot and MD% versus H plot, where the latter is found to obey ∝(H)m behaviour.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
