Substantial magnetoelectric coupling near room temperature in Bi2Fe4O9

Singh, Anupinder; Kaushik, S. D.; Kumar, Brijesh; Venimadhav, A.; Mishra, Priyanka; Siriguri, V.; Patnaik, S.

doi:10.1063/1.2905815

Cited by 153 publications

(91 citation statements)

References 23 publications

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“…13,14 This compound was originally synthesized in the seventies by Shamir et al, 16 but it has attracted recent interest since it is a common by-product in the synthesis of the well known multiferroic compound BiFeO 9 . In fact, Singh et al, 17 have shown that Bi 2 Fe 4 O 9 also shares some magnetoelectric properties.…”

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confidence: 99%

Quantum magnetism on the Cairo pentagonal lattice

2012

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We present an extensive analytical and numerical study of the antiferromagnetic Heisenberg model on the Cairo pentagonal lattice, the dual of the Shastry-Sutherland lattice with a close realization in the S = 5/2 compound Bi2Fe4O9. We consider a model with two exchange couplings suggested by the symmetry of the lattice, and investigate the nature of the ground state as a function of their ratio x and the spin S. After establishing the classical phase diagram we switch on quantum mechanics in a gradual way that highlights the different role of quantum fluctuations on the two inequivalent sites of the lattice. The most important findings for S = 1/2 include: (i) a surprising interplay between a collinear and a four-sublattice orthogonal phase due to an underlying order-by-disorder mechanism at small x (related to an emergent J1-J2 effective model with J2 ≫ J1), and (ii) a non-magnetic and possibly spin-nematic phase with d-wave symmetry at intermediate x.

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confidence: 99%

Quantum magnetism on the Cairo pentagonal lattice

2012

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“…6͒ and Bi 2 Fe 4 O 9 . 7 In this work we present results of a detail Ramanscattering study of Bi 2 Fe 4 O 9 single crystals in a broad temperature range ͑10-300 K͒. The symmetry of all first-order Raman phonon lines was identified and they were assigned to definite atomic motions by comparison to calculated frequencies and eigenvectors of the modes of same symmetry.…”

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confidence: 99%

Phonon and magnon scattering of antiferromagneticBi2Fe4O9

et al. 2010

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The phonon structure of antiferromagnetic Bi 2 Fe 4 O 9 ͑space group Pbnm No. 55, T N Ϸ 240 K͒ was studied theoretically by calculations of lattice dynamics and experimentally between 10 and 300 K by polarized Raman spectroscopy. Most of the 12A g +12B 1g +9B 2g +9B 3g Raman modes were unambiguously identified. Strong second-order scattering was observed for ab-plane-confined incident and scattered light polarizations. In addition to the phonon-scattering, broad Raman bands with typical characteristics of magnon scattering appear below T N . The magnon bands are analyzed on the basis of magnetic structure of Bi 2 Fe 4 O 9 and attributed to two-magnon excitations.

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“…[1][2][3][4][5][6][7][8] In the recent past there has been a renaissance in research on multiferroic systems primarily due to two reasons; the discovery of improper ferroelctricity in spin frustrated systems [9][10][11] and the observation of strain induced enhancement in ferroelectric Curie temperature and polarization in thin films of complex oxides. [12][13][14][15] Both these developments enable potential applications of multiferroic materials in information storage and spintronics such as magneto-electric sensors, magneto-capacitive devices, and electrically driven magnetic data storage.…”

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confidence: 99%

Effect of epitaxial strain on the magneto-electric coupling of YMnO3 thin films

Singh

Snure

Tiwari

et al. 2009

Journal of Applied Physics

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We report synthesis of phase pure multiferroic YMnO 3 thin films on sapphire (0001) with conducting ZnGaO buffer contact layer. Films were prepared by using pulsed laser deposition technique and characterized using x-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive absorption spectroscopy (EDAX) and magnetic field dependent dielectric measurement techniques. Structural characterizations indicated phase purity and epitaxial nature of the films. The dielectric response indicated an anomaly in dielectric constant ε and tanδ in the vicinity of 30 K, well below the bulk Néel temperature ~ 70 K. This anomaly in ε (T) and tanδ and its magnetic field dependence is explained as an influence of strain due to lattice mismatch between the substrate and YMnO 3 film. A substantial enhancement in magnetocapacitance was also observed for magnetic field applied parallel to ab plane of the film. Our results show that it is possible to tune the multiferroic property of YMnO 3 via changes in ferroelastic route.2

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Substantial magnetoelectric coupling near room temperature in Bi2Fe4O9

Cited by 153 publications

References 23 publications

Quantum magnetism on the Cairo pentagonal lattice

Quantum magnetism on the Cairo pentagonal lattice

Phonon and magnon scattering of antiferromagneticBi2Fe4O9

Effect of epitaxial strain on the magneto-electric coupling of YMnO3 thin films

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