Triclinic BiFeO3: A room-temperature multiferroic phase with enhanced magnetism and resistivity

TL;DR

This study demonstrates that triclinic BiFeO3 exhibits enhanced magnetism and resistivity at room temperature, making it a promising multiferroic phase for future applications, validated through experiments and theoretical calculations.

Contribution

It reveals the triclinic phase of BiFeO3 as a room-temperature multiferroic with improved magnetic and electrical properties, supported by experimental and computational evidence.

Findings

Triclinic BiFeO3 shows higher magnetization than rhombohedral phase.

Enhanced resistivity observed in triclinic BiFeO3.

Theoretical calculations confirm increased magnetic moments in triclinic BiFeO3.

Abstract

The magnetic and transport properties of BiFeO3/La2NiMnO6 (BFO/LNMO) composite have been investigated both experimentally and theoretically. Unlike the normal rhombohedral (R3c) phase, BFO in the composites is crystallized in the triclinic phase (P1). Interestingly, the composites demonstrate a significant enhancement in the magnetization, magnetoelectric coupling and show higher resistivity than that of the regular BFO (R3c). As LNMO has its Curie temperature at 280 K, the room temperature and above room temperature magnetic contribution in the composites is expected to be from the triclinic BFO phase. Experimentally observed enhancement in magnetization is validated using classical Monte Carlo simulation and density functional theory (DFT) calculations. The calculations reveal higher magnetic moments in triclinic BFO as compared to the rhombohedral BFO. Overall, this study reveals triclinic BFO as the promising room temperature multiferroic phase which is helpful to optimize the multiferroicity of BFO and achieve wider applications in future.