Spin Noncollinearlity in Multiferroic Phase of Triangular Lattice Antiferromagnet CuFe1-xAlxO2

Nakajima, Tsuyoshi; Mitsuda, Setsuo; Kanetsuki, Shunsuke; Prokeš, K.; Podlesnyak, A.; Kimura, Hiroyuki; Noda, Yukio

doi:10.1143/jpsj.76.043709

Cited by 82 publications

(95 citation statements)

References 17 publications

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“…1b), which stacks along [001] direction, results in the complex magnetic phase diagram including the screw spin structure 24,25 . The slight doping of the non-magnetic ions, such as the Al 26,27 and Ga 28,29 , stabilizes the screw spin phase, whose magnetic modulation vector has an incommensurate wave number (q, q, 3/2) with q ¼ 0.202 below 7.4 K (see Fig. 1b,c).…”

Section: Resultsmentioning

confidence: 99%

Magnetochiral dichroism resonant with electromagnons in a helimagnet

et al. 2014

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Cross-coupling between magnetism and electricity in a solid can be hosted by multiferroics with both magnetic and ferroelectric orders. In multiferroics, the collective spin excitations active for both electric and magnetic fields, termed electromagnons, play a crucial role in the elementary process of magnetoelectric (ME) coupling. Here we report the colossal dynamical (optical) ME effect, or more specifically the magnetochiral (MCh) effect, in the electromagnon resonance for the screw spin helimagnet CuFe 1 À x Ga x O 2 (x ¼ 0.035). The MCh effect shows up as the nonreciprocal directional dichroism; the extinction coefficient is different for counter-propagating lights, as large as by 400%. The MCh effect derived from the screw spin order is proved by control of the magnetic helicity of helimagnetism and its magnetization. The results point to the general presence of the MCh effect in helimagnets, paving a way to the ME control of electromagnetic wave in the giga-to tera-hertz region.

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Section: Resultsmentioning

confidence: 99%

Magnetochiral dichroism resonant with electromagnons in a helimagnet

et al. 2014

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“…However, there are several ME multiferroic materials whose ferroelectricity cannot be explained by either of these models, 9 for example, delafossite multiferroic CuFeO 2 . 10,11,12 Hence, identification of microscopic spin-polarization coupling in these systems paves the way for a new design of multiferroic materials.…”

Section: Introductionmentioning

confidence: 99%

“…Recent neutron diffraction measurements in applied field revealed that the ferroelectric phase magnetic structure is an antiferromagnetically stacked proper helical magnetic structure. 11 The wave vector is incommensurate. The helical axis is parallel to the hexagonal [110] direction, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Identification of microscopic spin-polarization coupling in the ferroelectric phase of magnetoelectric multiferroicCuFe1−xAlxO2
Nakajima
¹
,
Mitsuda
²
,
Inami
³

et al. 2008
Phys. Rev. B
Self Cite
37
0
33
1
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We have performed synchrotron radiation X-ray and neutron diffraction measurements on magnetoelectric multiferroic CuFe1−xAlxO2 (x = 0.0155), which has a proper helical magnetic structure with incommensurate propagation wave vector in the ferroelectric phase. The present measurements revealed that the ferroelectric phase is accompanied by lattice modulation with a wave number 2q, where q is the magnetic modulation wave number. We have calculated the Fourier spectrum of the spatial modulations in the local electric polarization using a microscopic model proposed by Arima [T. Arima, J. Phys. Soc. Jpn. 76, 073702 (2007)]. Comparing the experimental results with the calculation results, we found that the origin of the 2q-lattice modulation is not conventional magnetostriction but the variation in the metal-ligand hybridization between the magnetic Fe (2008)], we conclude that the microscopic origin of the ferroelectricity in CuFe1−xAlxO2 is the variation in the metal-ligand hybridization with spin-orbit coupling.

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“…87 The first field-induced phase is stable in magnetic fields between 7 and 13.5 T, 89 and is an incommensurate ferroelectric phase 87,89 that shows proper screw order. 90 Partial chemical substitution of Fe by Al 3 þ or Ga 3 þ 91 stabilizes the proper screw helical phase in zero magnetic field. 92 The observed polarization in these proper screw magnets can be explained in terms of a spin-dependent metal-ligand p-d hybridization 78,79,93 mechanism.…”

Section: Proper Screw Spin Ordermentioning

confidence: 99%

Multiferroic Materials: Physics and Properties

Palstra

Blake

2016

Reference Module in Materials Science and Materials Engineering

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Multiferroics are materials in which magnetism and ferroelectricity coexist. They are of fundamental interest to understand electronic behavior coupling magnetic interactions and electric dipolar order. Moreover, they are of applied interest because they allow various types of novel magnetic and electric device structures. We distinguish two important classes of multiferroic materials and discuss mechanisms and materials belonging to each class separately. In the first group of multiferroics, magnetization and polarization arise independently from each other. In the second category of multiferroics, ferroelectricity is induced by magnetic order, resulting in strong magnetoelectric coupling. We also briefly discuss multiferroic thin film heterostructures showing interfacial magnetoelectric coupling interactions with potential applications in memory devices

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Spin Noncollinearlity in Multiferroic Phase of Triangular Lattice Antiferromagnet CuFe_1-xAl_xO₂

Cited by 82 publications

References 17 publications

Magnetochiral dichroism resonant with electromagnons in a helimagnet

Magnetochiral dichroism resonant with electromagnons in a helimagnet

Identification of microscopic spin-polarization coupling in the ferroelectric phase of magnetoelectric multiferroicCuFe1−xAlxO2
Nakajima
¹
,
Mitsuda
²
,
Inami
³

et al. 2008
Phys. Rev. B
Self Cite
37
0
33
1
View full text Add to dashboard Cite

Multiferroic Materials: Physics and Properties

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Spin Noncollinearlity in Multiferroic Phase of Triangular Lattice Antiferromagnet CuFe1-xAlxO2

Cited by 82 publications

References 17 publications

Magnetochiral dichroism resonant with electromagnons in a helimagnet

Magnetochiral dichroism resonant with electromagnons in a helimagnet

Identification of microscopic spin-polarization coupling in the ferroelectric phase of magnetoelectric multiferroicCuFe1−xAlxO2Nakajima1, Mitsuda2, Inami3 et al. 2008Phys. Rev. BSelf Cite370331View full textAdd to dashboardCite

Multiferroic Materials: Physics and Properties

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Spin Noncollinearlity in Multiferroic Phase of Triangular Lattice Antiferromagnet CuFe_1-xAl_xO₂

Identification of microscopic spin-polarization coupling in the ferroelectric phase of magnetoelectric multiferroicCuFe1−xAlxO2
Nakajima
¹
,
Mitsuda
²
,
Inami
³

et al. 2008
Phys. Rev. B
Self Cite
37
0
33
1
View full text Add to dashboard Cite