Room-temperature single phase multiferroic magnetoelectrics: Pb(Fe, M)x(Zr,Ti)(1−x)O3 [M = Ta, Nb]

Sanchez, Dilsom A.; Ortega, N.; Kumar, Ashok; Sreenivasulu, G.; Katiyar, Ram S.; Scott, J. F.; Evans, Donald M.; Arredondo, Miryam; Schilling, A.; Gregg, J. M.

doi:10.1063/1.4790317

Cited by 113 publications

(52 citation statements)

References 48 publications

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“…93 The hysteresis behavior of a E,31 is almost symmetric with respect to change in sign of applied magnetic field (either þH or ÀH) which can be originate from a small biquadratic term P 2 M 2 and can be non-linear magnetoelectricity. 94 …”

Section: J Magnetoelectric Couplingmentioning

confidence: 99%

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Kumari

Ortega

Kumar

et al. 2015

Journal of Applied Physics

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We describe systematic studies on Nd and Mn co-doped BiFeO 3 , i.e., (Bi 0.95 Nd 0.05 ) (Fe 0.97 Mn 0.03 )O 3 (BNFM) polycrystalline electroceramics. Raman spectra and X-ray diffraction patterns revealed the formation of rhombohedral crystal structure at room temperature, and ruled out structural changes in BiFeO 3 (BFO) after low percentage chemical substitution. Strong dielectric dispersion and a sharp anomaly around 620 K observed near the Neel temperature (T N $ 643 K of BFO) support strong magneto-dielectric coupling, verified by the exothermic peak in differential thermal data. Impedance spectroscopy disclosed the appearance of grain boundary contributions in the dielectric data in the region, and their disappearance just near the Neel temperature suggests magnetically active grain boundaries. The resistive grain boundary components of the BNFM are mainly responsible for magneto-dielectric coupling. Capacitive grain boundaries are not observed in the modulus spectra and the dielectric behavior deviates from the ideal Debye-type. The ac conduction studies illustrate short-range order with ionic translations assisted by both large and small polaron hopping. Magnetic studies indicate that the weak antiferromagnetic phase of BNFM ceramics is dominated by a strong paramagnetic response (unsaturated magnetization even at applied magnetic field of 7 T). The bulk BNFM sample shows a good in-plane magnetoelectric coupling (ME) coefficient. V C 2015 AIP Publishing LLC. [http://dx

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Section: J Magnetoelectric Couplingmentioning

confidence: 99%

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Kumari

Ortega

Kumar

et al. 2015

Journal of Applied Physics

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“…The temperature dependences of mass magnetization and reciprocal of mass susceptibility have similar runs for all compositions. However, unlike to works [8,9], the results of our magnetic investigations do not exhibit ferromagnetic ordering at room temperature but rather weak antiferromagnetism for x = 0.45. We can also say that up to room temperature any magnetic phase transition has not occurred.…”

Section: Discussionmentioning

confidence: 39%

“…For x = 0.1 to 0.4 this solid solution exhibits saturated ferroelectric hysteresis loops with saturation polarization about 25 to 40 µC/cm 2 and square saturated magnetic hysteresis loops with magnetization 0.1 emu/g at 295 K (i.e. weak ferromagnetism) [7][8][9]. It means that PZT-PFT belongs to the class of materials known as multiferroics.…”

Section: Introductionmentioning

confidence: 99%

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Dispersion of dielectric permittivity and magnetic properties of solid solution PZT–PFT

Skulski

Niemiec

Bochenek

et al. 2015

Materials Science-Poland

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In this paper we present the results of investigations into ceramic samples of solid solution (1−x)(PbZr 0.53 Ti 0.47 O 3 )-x(PbFe 0.5 Ta 0.5 O 3 ) (i.e. (1−x)PZT-xPFT) with x = 0.25, 0.35 and 0.45. We try to find the relation between the character of dielectric dispersion at various temperatures and the composition of this solution. We also describe the magnetic properties of investigated samples. With increasing the content of PFT also mass magnetization and mass susceptibility increase (i.e. magnetic properties are more pronounced) at every temperature. The temperature dependences of mass magnetization and reciprocal of mass susceptibility have similar runs for all the compositions. However, our magnetic investigations exhibit weak antiferromagnetic ordering instead of the ferromagnetic one at room temperature. We can also say that up to room temperature any magnetic phase transition has not occurred. It may be a result of the conditions of the technological process during producing our PZT-PFT ceramics.

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“…3 ('PZT') have been under study for several years in a San Juan-Cambridge-Belfast collaboration that now includes Delhi. [32][33][34][35][36][37][38][39][40] The reason is shown in the Venn diagram in Figure 4. Each of the Fe-compounds is ferromagnetic at modest temperatures and ferroelectric at low temperatures.…”

Section: Copper Oxidementioning

confidence: 99%

Room-temperature multiferroic magnetoelectrics

2013

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A short review is given of the recent work on single-phase crystals that are ferroelectric and ferromagnetic at or near room temperature. BiFeO 3 is mentioned only briefly, because it has been reviewed in detail elsewhere very recently; emphasis instead is on copper oxide, perovskite oxides with mixed B-site occupancy (such as Pb(Fe 1/2 Ta 1/2 ) x (Zr y Ti INTRODUCTIONMultiferroics are usually defined as single-phase crystals exhibiting at the same temperature and pressure both ferromagnetism (or antiferromagnetism) and ferroelectricity (or antiferroelectricity). As most ferroelectrics are also ferroelastic 1 (hysteretic stress-strain relationships), the 'multi-ferro' label often includes three coupled order parameters. (As a peripheral comment, we note that it is necessary and sufficient 2 for a ferroelectric to be ferroelastic if its phase transition changes the crystal class-for example, from orthorhombic to tetragonal-treating hexagonal and trigonal as a single super-class. Examples of nonferroelastic ferroelectrics include KTiOPO 4 and LiNbO 3 , whose ferroelectric transitions are, respectively, orhorhombic-orthorhombic and trigonal-trigonal.)The interest in multiferroics at present is growing rapidly, and the interest is twofold: from a fundamental point of view the coupling between spins and lattices in crystals-between magnetism and ferroelectricity and/or structural phase transitions-has been recognized as complex and fascinating for several decades, generally requiring low-symmetry materials that were carefully avoided in earlier days of solid state theory. A good reason why it is presented in the elegant work by Schmid and Trooster 3 on the boracites: These materials (for example, nickel-iodine boracite) are multiferroic only at cryogenic temperatures and grow in needle-like structures, making them impractical for commercial device applications; and theoretically they exhibit low symmetry (monoclinic or triclinic) and have as many as 96 atoms per unit cell, making them theoretically formidable. Despite these drawbacks, multiferroics present a possible avenue for the next generation of computer digital memories, combining at least in principle, the high-speed and low-power consumption 4,5 of a ferroelectric random access memory (FRAM) with the nondestructive READ operation of a magnetic RAM. We discuss below why these goals will not be easy to achieve in commercial products:The most serious problems are operational temperature (most multiferroics operate well below ambient) and magnitudes of magnetization (all multiferroics with reasonably high operating temperatures are weak ferromagnets-canted antiferromagnetswhereas a strong ferromagnet is desired), and the switched polarization is also extremely weak. The polarization in most multiferroics is so weak that authors measure it in nC m À2 rather than the older customary mC cm À2 . Keep in mind that equally good SI units would be C hectare À1 for these multiferroics, a value far lower than the roughly 1 mC cm À2 required by a computer memory sense ampl...

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Room-temperature single phase multiferroic magnetoelectrics: Pb(Fe, M)x(Zr,Ti)(1−x)O3 [M = Ta, Nb]

Cited by 113 publications

References 48 publications

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Dielectric anomalies due to grain boundary conduction in chemically substituted BiFeO3

Dispersion of dielectric permittivity and magnetic properties of solid solution PZT–PFT

Room-temperature multiferroic magnetoelectrics

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