Magnetodielectric effect in BaTiO3−LaMnO3 composites

Abstract

The structural, dielectric, magnetic, and magnetodielectric properties were systematically investigated for (1−x)BaTiO3−(x)LaMnO3 composites in wide temperatures, frequencies, and mole percent (x). Dielectric anomaly around 410 K and magnetic hysteresis at 293 K were clearly observed, which might imply the coexistence of ferroelectricity and ferromagnetism at room temperature. The values of magnetodielectric effect were well scaled with M2, i.e., ([ε(H)−ε(0)]/ε(0))∼M2, and were increased with x. The observed magnetodielectric effect were discussed in conjunction with the formation of a magnetoresistive (La,Ba)MnO3 phase.

Multiferroic behavior in glass–crystal nanocomposites containing Te2NiMnO6

“…The magnetodielectric parameter (MD) defined as ε(H)−ε(0) ε(0) × 100 is estimated to be 0.55% where ε(H) and ε(0) are the values of dielectric constant at magnetic field H and zero respectively. This value is larger than those reported in recent years for other multiferroic systems like Bi 2 NiMnO 6 [45], BiFeO 3 [46], and BaTiO 3 -LaMnO 3 composites [47]. The values in the latter have been found to be in the range 0.03-0.1%.…”

Magneto-electric coupling study in multiferroic La0.7Ba0.3MnO3–BaTiO3 composite ceramic at room temperature

“…[7] and o 1% of BaTiO 3 À LaMnO 3 composites at 9 T in Ref. [8]. The loss tangent obviously increased after being magnetized, and the increases is more obvious in the lowfrequency range than in the high-frequency range.…”

“…The group of N.G. Kim [8] investigated the magneto-capacitance effect in BaTiO 3 À LaMnO 3 composites; the value ((ε(H) À ε(0))/ε (0)) of all samples is quite small (o 1%), even in strong magnetic field with 9 T. The authors mentioned that the phase formation of (La,Ba)MnO 3 was crucial for magneto-capacitance effect. The origin of such effect was due to the coexistence of magneto-resistance and magnetostriction in (La,Ba)MnO 3 .…”

“…Due to weak ME coupling at and above room temperatures in single-phase materials, increasing interest has been focused on composite multiferroics. Composite multiferroics can be labeled according to their architectures, such as particulate-based composites (0-3) [4][5][6][7][8], layered heterostructures (2-2) [9][10][11][12], pillars within a 3-D matrix (1)(2)(3) [13][14], and core-shell structures [15][16][17]. Compared with the weak mechanical coupling in 2-2 structures and difficulty in implementation of 1-3 and core-shell structures, particulate-based composites still attracted great attention because of their relative large mechanical coupling, superior mechanical strength and ease of fabrication.…”

Magnetodielectric effect in composites of nanodimensional glass and CuO nanoparticles

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. Most of these materials fall into the category of multiferroics-a single phase material possessing both ferroelectric and ferromagnetic order.…”