The preparation, and structural and multiferroic properties of B-site ordered double-perovskite Bi₂FeMnO₆

Abstract

Highly ordered Bi 2 FeMnO 6 epitaxial thin films have been successfully grown on SrTiO 3 substrate.Both high-flux synchrotron X-ray diffraction reciprocal space mapping and high resolution transmission electron microscopy confirmed the alternative alignment of Fe and Mn along [111] direction of Bi 2 FeMnO 6 films. Magnetic and ferroelectric properties of Bi 2 FeMnO 6 films are characterized and analyzed. The room-temperature ferroelectricity is well kept in Bi 2 FeMnO 6 film as expected.However, it is very interesting that Bi 2 FeMnO 6 film exhibits a typical spin-glass behavior and very weak magnetism rather than a ferri/ferromagnetism as generally believed. Our first-principles calculations suggest a spin frustration model for Bi 2 FeMnO 6 , which can well explain the intriguing magnetic property of Bi 2 FeMnO 6 film.

Enhanced spontaneous polarization in double perovskite Bi2FeCrO6 films

“…In addition, structural defects may pin these magnetic nanocluster and contribute the extrinsic high coercive field. Figure C,D show the field‐cooled and zero‐field‐cooled magnetization curves measured in the temperature range 4.2‐300 K. Unlike recent finding of spin glass state in B‐site ordered Bi 2 FeMnO 6 films, our measurements of FC and ZFC magnetization curves show a minor magnetization with no evidence of a magnetic transition. Therefore, the magnetism appears to be dominated by antiferromagnetic d 3 ‐ d 3 (Cr 3+ ‐Cr 3+ ) and d 5 ‐ d 5 (Fe 3+ ‐Fe 3+ ) coupling.…”

Mixing A -type and G -type B -site antiferromagnetism in AMn1Pajerowski1 2018Phys. Rev. B5020View full textAdd to dashboardCite

“…Such a study may be relevant to understanding interactions between dissimilar transition metals with similar ionic radii that are difficult to stabilize as double perovskites. The Mn 3+ is a 5 D ground state 3d 4 ion, which in Oh octahedral oxygen coordination has a 5 Eg ground state with S = 2.…”

“…The Fe 3+ is a 6 S ground state 3d 5 ion, which in octahedral oxygen coordination symmetry has a 6 A1g ground state with S = 5/2. [68] This Fe 3+ is not Jahn-Teller active and distortions from Oh symmetry are smaller than for the Mn 3+ with a standard deviation in metal oxygen bond length of the order of 0.01 Å compared to ten times that for the Mn 3+ .…”

“…The desire to understand AMFO magnetism is bolstered by recent reports on chemically ordered films. Examples of double perovskite manganese-iron films include La2MnFeO6, [3,4] the putative multiferroic Bi2MnFeO6, [5][6][7][8][9][10] and magnetic property calculations on the as yet unsynthesized Ho2MnFeO6. [11] Without chemical order, (La0.5Bi0.5)(Mn0.5Fe0.5)O3.9 films have been reported as multiferroic.…”

Synthesis, Structural Characterization, Dielectric and Piezoelectric Properties of Multiferroic Double-perovskite Bi2FeMnO6 Ceramics

“…The as-prepared BFMO ceramics exhibited an antiferromagnetic behavior with a TN = 288 K. In addition, a semiconductor-insulator phase transition was observed at TP  140 K. Different electrical properties were measured in the as-prepared BFMO ceramics within three distinct temperature ranges (e.g., T > TN, TN > T> TP, and T < TP). To make full use of the multiferroic properties of BFMO materials in the field of information storage devices, the ferroelectric and magnetic properties of BFMO thin films have received much attention [27][28][29][30][31][32][33][34]. For example, Zhao et al [27] investigated the multiferroic properties of Nd:BFO/BFMO bilayer films deposited on Pt/Ti/SiO2/Si substrate by pulsed laser deposition (PLD) method, and they found that the films underwent a ferromagnetic transition at 440 K and exhibited both ferrimagnetism and ferroelectricity at room temperature.…”