Infrared and magnetic characterization of multiferroic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">Fe</mml:mi><mml:mi mathvariant="normal">Cr</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>thin films over a broad temperature range

Kamba, S.; Nuzhnyy, D.; Nechache, Riad; Závěta, K.; Nižňanský, Daniel; Šantavá, E.; Harnagea, Cătălin; Pignolet, A.

doi:10.1103/physrevb.77.104111

Cited by 27 publications

(30 citation statements)

References 29 publications

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“…Following the above argument, the much larger SPC effect in LaCrO 3 than that in LaFeO 3 [8,20] reported in literature is not surprising. In addition, a recent experiment in Bi 2 FeCrO 6 [35] suggested a spin-phonon coupling could be induced when the empty d states are introduced by Cr to replace Fe, which is also consistent with the conclusion in this work.…”

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confidence: 92%

Electronic origin of the spin-phonon coupling effect in transition-metal perovskites

Wang

Jiang

et al. 2017

Phys. Rev. B

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By applying Wannier-based extended Kugel-Khomskii model, we carry out first-principles calculations and electronic structure analysis to understand the spin-phonon coupling effect in transitionmetal perovskites. We demonstrate the successful application of our approach to SrMnO3 and BiFeO3. We show that both the electron orbitals under crystal field splitting and the electronic configuration should be taken into account in order to understand the large variances of spin-phonon coupling effects among various phonon modes as well as in different materials. PACS numbers: 75.85.+t, 77.84.Lf Spin-phonon coupling (SPC) is an important physical effect of multiferroic materials [1], in which the cross couplings between structural distortions and magnetic orderings are closely associated with their key functionalities, such as magnetoelectric coupling and magnetodielectric response. Due to its fundamental and technological importance, the SPC effect is currently under intense scientific investigations [2][3][4][5].The mechanism in realizing SPC is not obviously accessible since the structural distortion, in particular the development of ferroelectricity (FE), does not necessarily induce a change of the magnetic interaction of the material. SPC can be realized by the relativistic effect through the spin-orbital interaction. FE can be induced by the spin spiral structure that breaks the inversion symmetry [6], or the crystal structure in improper multiferroics can be compatible with spin configurations generating the weak ferromagnetism (FM) [7,9,10]. Unfortunately, the resulting electric and magnetic moments are generally small. Recently, a new SPC mechanism has been discovered in ABO 3 perovskites, in which A or B is magnetic transition metal [11][12][13][14][15][16][17][18]. It was found that the low-lying phonon modes, particularly the polar ones, are significantly softened when the spin coupling is changed from being antiferromagnetic (AFM) to FM.First-principles calculations have pioneered the search for SPC materials, from which the differences of phonon frequencies between different spin configurations can be predicted. As a result, a number of transition-metal perovskites with SPC effect have been successfully identified [11][12][13]. Notwithstanding the progress in the field, several fundamental properties remain to be understood. First, for a single material, the SPC strength varies significantly among different phonon modes [19][20][21]. Second, SPC is not observed as a general property for multiferroic materials. In particular, BiFeO 3 (BFO) as one of the most studied room temperature multiferroic materials has surprisingly small SPC effect [22,23]. Based on the Goodenough-Kanamori-Anderson (GKA) rules, the metal-oxygen-metal angles are often used to explain the SPC effect [24,25]; however, a phenomenological argument based on the exchange angle only roughly captures the effect. Therefore, it is not either accurate or conclusive. Precise assignments of electronic processes involved in the magnetic exchange ...

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supporting

confidence: 92%

Electronic origin of the spin-phonon coupling effect in transition-metal perovskites

Wang

Jiang

et al. 2017

Phys. Rev. B

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“…Foreseeably, if the peak is in fact entirely magnetic, when going above T N this signal should vanish in the neutron patterns as the magnetic ordering is lost. The initial simulations 8 and one experimental bulk synthesis 12 suggest a magnetic transition temperature below room temperature, but many other reports note magnetization at and above room temperature with predicted transitions at 450-600 K. 27,28 To this end, a Rietveld refinement was carried out using data measured at 500 K, a temperature which according to the muon data (vide infra) lies above T N . As can be seen from (Fig.…”

Section: Resultsmentioning

confidence: 99%

Study of the B-site ion behaviour in the multiferroic perovskite bismuth iron chromium oxide

McBride

Lieschke

Berlie

et al. 2018

Journal of Applied Physics

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“…The near-normal incidence farinfrared reflectance spectra were collected from a 3-4 mm diameter circular area of the thin film using a Fourier transform infrared spectroscopy instrument Bruker IFS 113v, similarly as described, e.g., in Ref. 42. 90 ferroelastic walls separating the c-domains from adomains; similarly, the lines inclined at 45 with respect to the edges of the image can be associated with projections of 90 ferroelastic walls separating the a-domains with spontaneous polarization oriented along [100] and [010] directions (a 1 and a 2 ferroelastic domains, respectively).…”

Section: Methodsmentioning

confidence: 99%

Ferroelectric domains in epitaxial PbTiO3 films on LaAlO3 substrate investigated by piezoresponse force microscopy and far-infrared reflectance

Simon

Borodavka

Gregora

et al. 2011

Journal of Applied Physics

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Infrared and magnetic characterization of multiferroicBi2FeCrO6thin films over a broad temperature range

Cited by 27 publications

References 29 publications

Electronic origin of the spin-phonon coupling effect in transition-metal perovskites

Electronic origin of the spin-phonon coupling effect in transition-metal perovskites

Study of the B-site ion behaviour in the multiferroic perovskite bismuth iron chromium oxide

Ferroelectric domains in epitaxial PbTiO3 films on LaAlO3 substrate investigated by piezoresponse force microscopy and far-infrared reflectance

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