Bulk magnetoelectricity in the hexagonal manganites and ferrites

Das, Hena; Wysocki, Aleksander L.; Geng, Yaoxiang; Wu, Weida; Fennie, Craig J.

doi:10.1038/ncomms3998

Cited by 195 publications

(241 citation statements)

References 39 publications

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“…The Mn-Mn interactions between adjacent Mn planes are due to superexchange mechanism via the apical oxygens of MnO 5 bipyramids. When x = ( ) is a critical threshold value and determines the stability of magnetic structure below T N [12,15].…”

Section: +mentioning

confidence: 99%

Spin-lattice coupling and frustrated magnetism in Fe-doped hexagonal LuMnO ₃

Nair¹,

Fu²,

Kumar³

et al. 2015

EPL

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Strong spin-lattice coupling and prominent frustration effects observed in the 50% Fe-doped frustrated hexagonal (h)LuMnO3 are reported. A Néel transition at TN ≈ 112 K and a possible spin re-orientation transition at TSR ≈ 55 K are observed in the magnetization data. From neutron powder diffraction data, the nuclear structure at and below 300 K was refined in polar P 63cm space group. While the magnetic structure of LuMnO3 belongs to the Γ4 (P 6 3 c m) representation, that of LuFe0.5Mn0.5O3 belongs to Γ1 (P 63cm) which is supported by the strong intensity for the (100) reflection and also judging by the presence of spin-lattice coupling. The refined atomic positions for Lu and Mn/Fe indicate significant atomic displacements at TN and TSR which confirms strong spin-lattice coupling. Our results complement the discovery of room temperature multiferroicity in thin films of hLuFeO3 and would give impetus to study LuFe1−xMnxO3 systems as potential multiferroics where electric polarization is linked to giant atomic displacements.

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Section: +mentioning

confidence: 99%

Spin-lattice coupling and frustrated magnetism in Fe-doped hexagonal LuMnO ₃

Nair¹,

Fu²,

Kumar³

et al. 2015

EPL

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“…Hexagonal LuFeO 3 (h-LuFeO 3 ) is a multiferroic material that exhibits spontaneous electric and magnetic polarizations simultaneously. [1][2][3][4][5] It has been predicted that the magnetic dipole moment in h-LuFeO 3 can be switched by an electric field, 6 which is appealing for application in energy efficient information storage and processing. [7][8][9] Rather than h-LuFeO 3 , the orthorhombic crystallographic structure (o-LuFeO 3 ) is the thermodynamically stable bulk structure of LuFeO 3 with standard conditions, 10 meaning that the free energy of o-LuFeO 3 is lower than that of the h-LuFeO 3 .…”

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confidence: 99%

Phase separation in LuFeO3 films

Cao

Zhang

Sinha

et al. 2016

Applied Physics Letters

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The structural transition at about 1000 {\deg}C, from the hexagonal to the orthorhombic phase of LuFeO3, has been investigated in thin films of LuFeO3. Separation of the two structural phases of LuFeO3 occurs on a length scale of micrometer, as visualized in real space using X-ray photoemission electron microscopy (X-PEEM). The results are consistent with X-ray diffraction and atomic force microscopy obtained from LuFeO3 thin films undergoing the irreversible structural transition from the hexagonal to the orthorhombic phase of LuFeO3, at elevated temperatures. The sharp phase boundaries between the structural phases are observed to align with the crystal planes of the hexagonal LuFeO3 phase. The coexistence of different structural domains indicates that the irreversible structural transition, from the hexagonal to the orthorhombic phase in LuFeO3, is a first order transition, for epitaxial hexagonal LuFeO3 films grown on Al2O3

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“…17 Landau theory with parameters determined from first-principles calculations indicates that the vortices are topological defects with emergence of Z 2 × Z 3 symmetry and the unique coupling between the ferroelectric and magnetic domain walls. 18,19 A network of vortices and antivortices in h-RMnO 3 can be neatly analyzed in terms of graph theory. 20 The density of vortex network strongly varies depending on heat treatment conditions.…”

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confidence: 99%