Room-temperature paramagnetoelectric effect in magnetoelectric multiferroics Pb(Fe1/2Nb1/2)O3 and its solid solution with PbTiO3

Abstract

We have observed the magnetoelectric response at room temperature and above in high-resistive ceramics made of multiferroic Pb(Fe1/2Nb1/2)O3 (PFN) and PFN-based solid solution 0.91PFN -0.09PbTiO3 (PFNPT). The value of the paramagnetoelectric (PME) coefficient shows a pronounced maximum near the ferroelectric-to-paraelectric phase transition temperature, TC, and then decreases sharply to zero for T > TC. The maximal PME coefficient in PFN is about 410 -18 s/A. The theoretical description of the PME effect, within the framework of a Landau theory of phase transitions allowing for realistic temperature dependences of spontaneous polarization, dielectric and magnetic susceptibilities, qualitatively reproduces well the temperature dependence of the PME coefficient. In particular, the Landau theory predicts the significant increase of the PME effect at low temperatures and near the temperature of the paraelectric-toferroelectric phase transition, since the PME coefficient is equal to the product of the spontaneous polarization, dielectric permittivity, square of magnetic susceptibility and the coefficient quantifying the strength of the biquadratic magnetoelectric coupling.

Magnetoelectric effect in antiferromagnetic multiferroic Pb(Fe1/2Nb1/2Laguta1, Stephanovich2, Raevski3 et al. 2017Phys. Rev. BSelf Cite410121View full textAdd to dashboardCite

“…Certainly, in the course of sample cooling from PM to AFM phase under poling field, magnetic domains become aligned. Our results show that both ferroelectric and AFM domains can be directly switched by an electric field also in the AFM phase though the coercive field increases by almost ten times (E c ≈ 25 kV/cm) as compared to PM phase [7,10]. To confirm our latter conclusion, additional neutron diffraction or AFM resonance measurements can be used to monitor the AFM domains rotation.…”

“…Interestingly, the phenomenological Landau theory predicts the ME coupling increase on cooling proportional to the square of magnetic susceptibility [10,15]. Such an increase has not been experimentally observed in PFN [1], though its susceptibility increases substantially at temperatures below T N ≈ 150 K [2].…”

“…To the best of our knowledge, this have been done only for single crystals and in the AFM phase [1,9]. We have found recently [10], that sizeable ME effect exists also in the paramagnetic (PM) phase of both PFN single crystals and ceramics as well as in PFN-PT solid solution ceramics. This ME effect disappears only in the paraelectric phase, where there is no spontaneous polarization.…”

Low-temperature neutron diffraction and magnetic studies on the magnetoelectric multiferroic Pb(Fe0.534Nb0.4W0.066)O3

“…However, due to its T N being far below room temperature, its practical applications in devices are limited. In this study, we concentrate on enhancing T N making a solid solution of PFN-PFW for near room temperature magnetoelectric applications [15,16]. Recently, many researchers have tried to tune the T N of PFN with various solid solutions, synthesis method and annealing parameters [17].…”

Cluster Superconductivity in the Magnetoelectric Pb(Fe1/2Sb1/2)O3 Ceramics

“…Here we report the first time observation of local superconductivity in the magnetoelectric Pb(Fe 1/2 Sb 1/2 )O 3 (PFS). This material possesses both magnetism and ferroelectricity like other much more known chemically disordered double perovskites PbFe 1/2 Nb 1/2 O 3 (PFN) and PbFe 1/2 Ta 1/2 O 3 (PFT) [9][10][11][12][13][14][15][16][17]. PFS shows quite intriguing magnetic properties such as existence of dynamic magnetic nanoregions with large frustrated magnetic superspins, which on cooling freeze in superspin glass state coexisting with the long-range ordered antiferromagnetic (AFM) phase at T < 32 K [9].…”