Low magnetic field response single-phase multiferroics under high temperature

Abstract

A new single-phase multiferroic material (SBFCT) has been developed, which functions well at high temperature (373 K) and under a low magnetic field. Using this new material, a prototype ME device was made, which demonstrated excellent and reliable low magnetic field response at high temperature.

Enhanced remnant polarization in ferroelectric Bi6Fe2Ti3O18 thin films

“…1(d) and is analogous to the results of other Aurivillius compounds. 7,11,19 The c-axis lattice constant c of the A-RTA thin film was measured to be 4.9356(1) nm, which is close to the value obtained from the XRD results.…”

Facile route to prepare grain-oriented multiferroic Bi7Fe3−Co Ti3O21 ceramics

“…Subsequently, we have reported that the cobalt-doped 6-layer Bi 7 Fe 3 Ti 3 O 21 presented much enhanced multiferroic properties too, together with the analogous morphotropic transformation (AMT) effect [7][8][9]. Especially, low magnetic field response magnetoelectric (ME) coupling well above the room temperature has been realized in single phase SrBi 5 Fe 0.5 Co 0.5 Ti 4 O 18 [10].…”

Cobalt-Substituted Seven-Layer Aurivillius Bi8Fe4Ti3O24 Ceramics: Enhanced Ferromagnetism and Ferroelectricity

“…Following this work of using the Co substitution strategy, most recent investigations on Bi 6 FeCrTi 3 O 18 [13], Bi 6 Fe 2−x Co x Ti 3 O 18 [17] (n = 5) and Bi 7 Fe 3−x Ni x Ti 3 O 21 [18] (n = 6) also revealed an enhanced FM performance at or above room temperature. Remarkably, Wang et al reported a plausible intrinsic magnetoelectric (ME) coupling in a five-layered Aurivillius ceramic, SrBi 5 Fe 0.5 Co 0.5 Ti 4 O 18 , even at a high temperature of 373 K, surpassing almost all single-phase multiferroic materials currently under investigation [19]. Furthermore, by a nanoscale structural modulation, such ME coupling may be further enhanced due to the appearance of a new analogous morphotropic transformation effect [20].…”

“…The detail values of 2M r and T N with different Co substitution concentrations are listed in Table 1. In order to recognize the ferromagnetic contribution from the magnetic impurities (e.g., CoFe 2 O 4 ) or the BFCT host in Aurivillius ceramics [19,20], a derivative thermos-magneto-gravimetry (DTMG) measurement was performed in the nitrogen atmosphere at a heating rate of 20 K/min with a 200 Oe applied magnetic field on the sample Bi 8 Fe 3.6 Co 0.4 Ti 3 O 24 (7-BFCT-0.4). As shown in Figure 3d, there was a peak at 753.4 K in the derivative weight curve, corresponding to the T N (750 K) measured using the ZFC-FC method, far higher than the 720 K of magnetic impurity CoFe 2 O 4 [20].…”