Magnetoelectric phase diagrams of orthorhombic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi><mml:msub><mml:mi>MnO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:mrow></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>R</mml:mi><mml:mo>=</mml:mo><mml:mi>Gd</mml:mi></mml:mrow></mml:math>, Tb, and Dy)

Kimura, T.; Lawes, G.; Goto, T.; Tokura, Y.; Ramirez, A. P.

doi:10.1103/physrevb.71.224425

Cited by 721 publications

(741 citation statements)

References 37 publications

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“…For such challenges new multiferroic materials are required in thin-film form, where the magnetic properties can be modified by electric fields and vice versa. A large variety of different single-phase compounds [7][8][9][10][11] and different types of heterostructures [12][13][14][15][16] have been considered to obtain such novel multifunctional properties, but large magnetoelectric coupling (MEC) effects of ferromagnetic and ferroelectric order parameters at room temperature, as desired for application, have not been demonstrated convincingly yet. The most prominent example of well-established MEC at elevated temperature may be BiFeO 3 (BFO), 9,17,18 where the ferroelectric and antiferromagnetic order parameters are coupled.…”

Section: Introductionmentioning

confidence: 99%

Magnetoimpedance spectroscopy of epitaxial multiferroic thin films

et al. 2012

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The detection of true magnetocapacitance (MC) as a manifestation of magnetoelectric coupling (MEC) in multiferroic materials is a nontrivial task, because pure magnetoresistance (MR) of an extrinsic MaxwellWagner-type dielectric relaxation can lead to changes in capacitance [G. Catalan, Appl. Phys. Lett. 88, 102902 (2006)]. In order to clarify such difficulties involved with dielectric spectroscopy on multiferroic materials, we have simulated the dielectric permittivity ε of two dielectric relaxations in terms of a series of one intrinsic film-type and one extrinsic Maxwell-Wagner-type relaxation. Such a series of two relaxations was represented in the frequency-(f -) and temperature-(T -) dependent notations ε vs f and ε vs T by a circuit model consisting in a series of two ideal resistor-capacitor (RC) elements. Such simulations enabled rationalizing experimental f -, T-, and magnetic field-(H -) dependent dielectric spectroscopy data from multiferroic epitaxial thin films of BiMnO 3 (BMO) and BiFeO 3 (BFO) grown on Nb-doped SrTiO 3 . Concomitantly, the deconvolution of intrinsic film and extrinsic Maxwell-Wagner relaxations in BMO and BFO films was achieved by fitting f -dependent dielectric data to an adequate equivalent circuit model. Analysis of the H -dependent data in the form of determining the H -dependent values of the equivalent circuit resistors and capacitors then yielded the deconvoluted MC and MR values for the separated intrinsic dielectric relaxations in BMO and BFO thin films. Substantial intrinsic MR effects up to 65% in BMO films below the magnetic transition (T C ≈ 100 K) and perceptible intrinsic MEC up to − 1.5% near T C were identified unambiguously.

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Section: Introductionmentioning

confidence: 99%

Magnetoimpedance spectroscopy of epitaxial multiferroic thin films

et al. 2012

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“…Manganites R 1-x A x MnO 3 (R=rare earth, A=alkaline earth) are attracting a renewed interest since the discovery of colossal magnetoresistance at certain compositions (see the work by Tokura 1 and references therein for a major review), magnetoelectric effects, [2][3][4] as well as due to the rich variety of physical phenomena responsible for their extremely complex phase diagrams. In this work, we are focusing our attention on the critical behavior of the magnetic transitions in RMnO 3 (R=La ... Lu,Y), as well as on their thermal properties as a function of temperature.…”

Section: Introductionmentioning

confidence: 99%

Critical behavior of the paramagnetic to antiferromagnetic transition in orthorhombic and hexagonal phases ofRMnO3(R=Sm
Oleaga
¹
,
Salazar
²
,
Prabhakaran
³

et al. 2012
Phys. Rev. B
57
6
49
0
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The critical behavior of the paramagnetic to antiferromagnetic transition in RMnO 3 (R = Sm, Tb, Dy, Ho, Er, Tm, Yb, Lu, Y) has been studied with an ac photopyroelectric calorimeter, which gives simultaneously the thermal diffusivity and specific heat as a function of temperature with high resolution around the Néel temperature. RMnO 3 (R = Sm, Tb, Dy) has an orthorhombic perovskite structure, whereas the other manganites are hexagonal, thus revealing a strong thermal anisotropy. SmMnO 3 with an Type-A antiferromagnetic ordering exhibits a 3D-XY critical behavior, which could be attributed to the peculiar site anisotropy of Sm 3+ and the exchange interaction between Mn 3+ and Sm 3+ ions. The sinusoidal spin ordering in TbMnO 3 and DyMnO 3 can be phenomenologically described by the 3D-Heisenberg model. Finally, the hexagonal manganites RMnO 3 (R = Ho, Er, Tm, Yb, Lu, Y) are close to the 3D-Heisenberg universality class, ruling out the chiral models predicted by the renormalization group theory.

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“…[2][3][4] A strong coupling exists in these compounds between the ferroelectric polarization and an ͑anti͒ferromagnetic order of the spin system. From the theoretical point of view, they challenge the usual explanation for ferroelectricity and magnetic order in transition metal systems.…”

Section: Introductionmentioning

confidence: 99%

Strong coupling between the spin polarization of Mn and Tb in multiferroicTbMnO3determined by x-ray resonance exchange scattering

et al. 2007

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We report on an x-ray resonance exchange scattering ͑XRES͒ study of multiferroic TbMnO 3 . Magnetic scattering is observed close to the Mn K edge and the Tb L III and L II edges. Surprisingly, Tb shows XRES also in the paraelectric phase, where neutron diffraction results suggested the 4f moments to be disordered. The temperature dependence of the XRES intensities shows a distinct kink close to the ferroelectric transition temperature T C for all absorption edges. We were able to model the temperature dependence for all edges, assuming a strong coupling of Mn and Tb magnetism via the spin polarized 5d conduction band. We argue that the hybridization between Mn and Tb states is a prerequisite for the multiferroic effect in this material.

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Magnetoelectric phase diagrams of orthorhombicRMnO3(R=Gd, Tb, and Dy)

Cited by 721 publications

References 37 publications

Magnetoimpedance spectroscopy of epitaxial multiferroic thin films

Magnetoimpedance spectroscopy of epitaxial multiferroic thin films

Critical behavior of the paramagnetic to antiferromagnetic transition in orthorhombic and hexagonal phases ofRMnO3(R=Sm
Oleaga
¹
,
Salazar
²
,
Prabhakaran
³

et al. 2012
Phys. Rev. B
57
6
49
0
View full text Add to dashboard Cite

Strong coupling between the spin polarization of Mn and Tb in multiferroicTbMnO3determined by x-ray resonance exchange scattering

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Magnetoelectric phase diagrams of orthorhombicRMnO3(R=Gd, Tb, and Dy)

Cited by 721 publications

References 37 publications

Magnetoimpedance spectroscopy of epitaxial multiferroic thin films

Magnetoimpedance spectroscopy of epitaxial multiferroic thin films

Critical behavior of the paramagnetic to antiferromagnetic transition in orthorhombic and hexagonal phases ofRMnO3(R=SmOleaga1, Salazar2, Prabhakaran3 et al. 2012Phys. Rev. B576490View full textAdd to dashboardCite

Strong coupling between the spin polarization of Mn and Tb in multiferroicTbMnO3determined by x-ray resonance exchange scattering

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Critical behavior of the paramagnetic to antiferromagnetic transition in orthorhombic and hexagonal phases ofRMnO3(R=Sm
Oleaga
¹
,
Salazar
²
,
Prabhakaran
³

et al. 2012
Phys. Rev. B
57
6
49
0
View full text Add to dashboard Cite