Giant electric field–controlled magnetism in Bi0.86Sm0.14FeO3 multiferroic ceramics with Pna21 symmetry. Issue 11 (28th July 2022)

• Record Type: Journal Article
• Authors: Liu, Lu; Zhang, Yehui; Shi, Xin Xin; Liu, Xiao Qiang; Zhu, Xiao Li; Xu, Bin; Chen, Xiang Ming
• Is Part Of: Journal of the American Ceramic Society. Volume 105:Issue 11(2022)
• Page Start: 6775
• Page End: 6786
• Publication Date: 2022-07-28
• Subjects: BiFeO3 -- electric field‐controlled magnetism -- magnetoelectric -- multiferroic; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.18666
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: In the present work, Bi0.86 Sm0.14 FeO3 ceramics with near Pna 21 single‐phase structure were obtained by a repeated longtime sintering process, and the dielectric, ferroelectric, and magnetic characteristics were determined together with the magnetoelectric coupling coefficient. The evolution of Pna 21 symmetry was revealed by transmission electron microscope analysis, and the ferroelectric transition from Pbnm to Pna 21 was determined by differential scanning calorimetry analysis together with the dielectric characterization, and the Curie temperature was determined as 195°C. The saturated polarization–electric field ( P–E ) hysteresis loop was obtained with P r = 12.2 μC cm −2, and the unlocking of ferromagnetism was confirmed by the apparent magnetization–magnetic field ( M–H ) hysteresis loop with M r = 77.4 emu mol −1 . The giant electric field–controlled magnetism was due to the Pna 21 / R3c field–induced transition, which was confirmed by both structure analysis and theoretical calculation, and the change of remanent magnetization under an electric field was achieved up to 44.8 emu mol −1 (57.9%), which was much bigger than that of rare‐earth (RE)‐substituted BiFeO3 ceramics without optimizing Pna 21 phase fraction. The present results might significantly deepen the physical understanding of Pna 21 phase and subsequently provide new hints on further enhancing electric field–controlled magnetism in RE‐substituted BiFeO3 multiferroic ceramics.