Spin-lattice coupling in multiferroic Pb(Fe1/2Nb1/2)O3 thin films

Peng, Wei; Lemée, N.; Karkut, M.G.; Dkhil, Brahim; Shvartsman, Vladimir V.; Borisov, Pavel; Kleemann, W.; Holc, Janez; Kosec, Marija; Blinc, R.

doi:10.1063/1.3067872

Cited by 55 publications

(38 citation statements)

References 25 publications

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“…Though the physics of ferroelectricity and magnetoelectric (ME) coupling in AMnO 3 is very exciting, they are not useful for practical applications at room temperature since the magnetic field-induced ferroelectric polarization is rather small and the magnetic transition occurs mostly below the liquid nitrogen temperature. The ferrimagnetic magnetic transition of PbFe 0.5 Nb 0.5 O 3 is also below 300 K. 8 The high values of ferroelectric Curie temperature (T C(FE) ~ 836 °C) 9,10 and antiferromagnetic transition temperature (T N ~ 370 °C) 11 found in BiFeO 3 make this compound more attractive. Ferroelectricity in BiFeO 3 is driven by the sterochemical 2 activity of 6s 2 lone pair of Bi 3+ ions, whereas the Fe ions order antiferromagnetically.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and magnetoelectric studies in pure and cation doped

Naik

Mahendiran

2009

Solid State Communications

124

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We report the effect of divalent cation (A) substitution on magnetic and magnetoelectric properties in Bi 1-x A x FeO 3 (A= Sr, Ba and Sr 0.5 Ba 0.5 ; x = 0 and 0.3). The rapid increase of magnetization below 100 K and a peak at the Neel temperature T N = 642±2 K found in BiFeO 3 is suppressed in the co-doped sample (A = Sr 0.15 Ba 0.15 ). All the divalent cation doped samples show enhanced magnetization with a well defined hysteresis loop compared to the parent compound. Both longitudinal (L-α ME ) and transverse (T-α ME ) magnetoelectric coefficients with dc magnetic field parallel and perpendicular to the direction of induced voltage, respectively, were measured using dynamic lock-in technique. It is found that the T-α ME increases in magnitude and exceeds the L-α ME with increasing size of the A cation. The maximum T-α ME = 2.1 mV/cmOe in the series is found for A = Sr 0.15 Ba 0.15 , though it is not the compound with the highest saturation magnetization. The observed changes in the magnetoelectric coefficient are suggested to possible modification in the domain structure and magnetoelectric coupling in these compounds.1

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Section: Introductionmentioning

confidence: 99%

Magnetic and magnetoelectric studies in pure and cation doped

Naik

Mahendiran

2009

Solid State Communications

124

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“…5 (c). Peng et al 41 reported the temperature evolution of the lattice parameter of PFN film grown by PLD technique (similar to us). Here we reproduced the lattice constant behavior of PFN film with the reported value of Peng et al (Fig.…”

Section: C2 Phonon Dynamics At the Regime Of Negative Thermal Expanmentioning

confidence: 99%

“…instead it undergoes thermal contraction 41 . In such a case the phonon energies should increase (as observed, see Fig.5).…”

Section: C2 Phonon Dynamics At the Regime Of Negative Thermal Expanmentioning

confidence: 99%

Phonon anomalies and phonon-spin coupling in oriented PbFe0.5Nb0.5O
Correa
¹
,
Kumar
²
,
Priya
³

et al. 2011
Phys. Rev. B
57
0
30
0
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We present Raman data on both single-crystal and thin-film samples of the multiferroic PbFe 0.5 Nb 0.5 O 3 . we show first that the number and selection rules of Raman lines is compatible with a face-centered cubic Fm-3m structure, as is known in other ABO 3 relaxors, such as The increase in frequency with increasing temperature for the lowest-energy F 2g phonon mode is particularly unexpected. These changes suggest the transition of crystal structure from an ordered phase to a disordered one near T B . The Raman study revealed phonon anomalies in the vicinity of T m and T N that are attributed to the dynamical behavior of polar nano-regions (PNRs) and spin-phonon coupling due to its relaxor and multiferroic nature respectively, which is well supported by dielectric and magnetic properties of the PFN thin film. Softening of the Fe-O mode was observed near the T N . We correlate the anomalous shift of the Fe-O mode frequency with the normalized square of the magnetization sublattice; agreement with the experimental 2 results suggest strong spin-phonon coupling near T N due to phonon modulation of the superexchange integral, however the shifts in frequency with temperature are small (< 3 cm -1 ).

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“…Consequently, it is reasonable to invoke magnetostriction in its switching dynamics at higher temperatures in an applied field H. PFN. Magnetic and electrical studies of PFN and of PFN mixed with PbMg 1/2 W 1/2 O 3 by Peng et al [40][41][42] revealed several important things: PFN can be prepared in a single phase, without any pyrochlore or other minor phases; it exhibits relaxor behavior characterized by antiferromagnetic clusters and by two equations-a standard Vogel-Fulcher Equation describing a characteristic relaxation frequency…”

Section: Lead-iron Perovskitesmentioning

confidence: 99%

“…400 K because of spin clustering. [41][42][43][44] This has been well studied in pure PFN via magnetic resonance. Such cluster systems are not readily amenable via conventional density functional technique theory but might be suited to the type of calculation published by Bersuker and colleagues.…”

Section: Lead-iron Perovskitesmentioning

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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Spin-lattice coupling in multiferroic Pb(Fe1/2Nb1/2)O3 thin films

Cited by 55 publications

References 25 publications

Magnetic and magnetoelectric studies in pure and cation doped

Magnetic and magnetoelectric studies in pure and cation doped

Phonon anomalies and phonon-spin coupling in oriented PbFe0.5Nb0.5O
Correa
¹
,
Kumar
²
,
Priya
³

et al. 2011
Phys. Rev. B
57
0
30
0
View full text Add to dashboard Cite

Room-temperature multiferroic magnetoelectrics

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Spin-lattice coupling in multiferroic Pb(Fe1/2Nb1/2)O3 thin films

Cited by 55 publications

References 25 publications

Magnetic and magnetoelectric studies in pure and cation doped

Magnetic and magnetoelectric studies in pure and cation doped

Phonon anomalies and phonon-spin coupling in oriented PbFe0.5Nb0.5OCorrea1, Kumar2, Priya3 et al. 2011Phys. Rev. B570300View full textAdd to dashboardCite

Room-temperature multiferroic magnetoelectrics

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Phonon anomalies and phonon-spin coupling in oriented PbFe0.5Nb0.5O
Correa
¹
,
Kumar
²
,
Priya
³

et al. 2011
Phys. Rev. B
57
0
30
0
View full text Add to dashboard Cite