Ferromagnetoelectric phases of hexaferrites: a group-theoretical analysis

Широков, В. Б.; Razumnaya, A. G.; Mikheykin, A.S.

doi:10.1107/s2052520621007125

Cited by 2 publications

(3 citation statements)

References 33 publications

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“…As noted by Shirokov et al (2021), a 'truly' collinear magnetic ordering is not symmetry protected in either P6 3 / mm 0 c 0 or Cm 0 cm 0 , and the model best describing our data supports the inclusion of these non-collinear terms. The observation of similar canting on the 8d oct site in SrCoZnFe 16 O 27 and the 6g oct site in SrZn 2 Fe 16 O 27 (highlighted in Fig.…”

Section: Magnetic Orderingsupporting

confidence: 80%

“…It is widely accepted that the feature responsible for magnetoelectric coupling in hexaferrites is the presence of conical spin order (Nakajima et al, 2016;Kocsis et al, 2019;Zhai et al, 2017;Shirokov et al, 2021). These conical orderings give rise to magnetoelectric coupling resulting from antisymmetric exchange: the inverse Dzylaoshinkii-Moriya interaction (Tokura et al, 2014;Fabrykiewicz et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

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Controlling the magnetic structure in W-type hexaferrites

Mørch¹,

Christensen²

2023

J Appl Cryst

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W-type hexaferrites with varied Co/Zn ratios were synthesized and the magnetic order was investigated using neutron powder diffraction. In SrCo2Fe16O27 and SrCoZnFe16O27 a planar (Cm′cm′) magnetic ordering was found, rather than the uniaxial ordering (P63/mm′c′) found in SrZn2Fe16O27 which is common in most W-type hexaferrites. In all three studied samples, non-collinear terms were present in the magnetic ordering. One of the non-collinear terms is common to the planar ordering in SrCoZnFe16O27 and uniaxial ordering in SrZn2Fe16O27, which could be a sign of an imminent transition in the magnetic structure. The thermomagnetic measurements revealed magnetic transitions at 520 and 360 K for SrCo2Fe16O27 and SrCoZnFe16O27, and Curie temperatures of 780 and 680 K, respectively, while SrZn2Fe16O27 showed no transition but a Curie temperature at 590 K. This leads to the conclusion that the magnetic transition can be adjusted by fine-tuning the Co/Zn stoichiometry in the sample.

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Section: Magnetic Orderingsupporting

confidence: 80%

Section: Introductionmentioning

confidence: 99%

Controlling the magnetic structure in W-type hexaferrites

Mørch¹,

Christensen²

2023

J Appl Cryst

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“…Biferroic materials, which can accommodate both ferromagnetic and ferroelectric orders simultaneously, are of particular interest owing to potential couplings between the magnetic and electrical properties and the resulting wide range of applications (Wadhawan, 2000;Eerenstein et al, 2006;Martin & Rappe, 2016;Uchino, 2018;Shirokov et al, 2021). However, there are significant challenges in fully investigating the actual crystalline structure to gain a complete understanding of the microscopic mechanisms underlying their intriguing macroscopic properties (Feng et al, 2022;Bertaut et al, 1966;Kim et al, 2007;Alvarez et al, 2010;Gervacio-Arciniega et al, 2018;Zhu et al, 2020a,b).…”

Section: Introductionmentioning

confidence: 99%

Insights into the structural symmetry of YCrO₃ from synchrotron X-ray diffraction

et al. 2022

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A high-resolution synchrotron X-ray diffraction study of a single-crystal YCrO3 compound was employed to obtain its crystallographic information, such as lattice parameters, atomic positions, bond lengths and angles, and local crystalline distortion size and mode. The measurements were taken at 120 K (below the antiferromagnetic transition temperature T N ≃ 141.5 K), 300 K (between T N and the ferroelectric transition temperature T C ≃ 473 K) and 500 K (above T C). Using the high intensity of synchrotron X-rays, it was possible to refine collected patterns with the previously proposed noncentrosymmetric monoclinic structural model (P1211, No. 4) and determine detailed structural parameters. Meanwhile, for a controlled study, the data were refined with the centrosymmetric orthorhombic space group (Pmnb, No. 62). The lattice constants a, b and c and the unit-cell volume increased nearly linearly upon heating. With the P1211 space group, the distributions of bond lengths and angles, as well as local distortion strengths, were observed to be more dispersed. This implies that (i) the local distortion mode of Cr2O6 at 120 K correlates with the formation of canted antiferromagnetic order by Cr1–Cr2 spin interactions, primarily via intermediate O3 and O4 ions; and (ii) the previously reported dielectric anomaly may have a microscopic origin in the strain-balanced Cr1—O3(O4) and Cr2—O5(O6) bonds as well as the local distortion modes of Cr1O6 and Cr2O6 octahedra at 300 K. Local crystalline distortion is shown to be an important factor in the formation of ferroelectric order. The comprehensive set of crystallographic information reported here allows for a complete understanding of the unique magnetic and ferroelectric properties of YCrO3.

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Ferromagnetoelectric phases of hexaferrites: a group-theoretical analysis

Cited by 2 publications

References 33 publications

Controlling the magnetic structure in W-type hexaferrites

Controlling the magnetic structure in W-type hexaferrites

Insights into the structural symmetry of YCrO₃ from synchrotron X-ray diffraction

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Ferromagnetoelectric phases of hexaferrites: a group-theoretical analysis

Cited by 2 publications

References 33 publications

Controlling the magnetic structure in W-type hexaferrites

Controlling the magnetic structure in W-type hexaferrites

Insights into the structural symmetry of YCrO3 from synchrotron X-ray diffraction

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Product

Resources

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Insights into the structural symmetry of YCrO₃ from synchrotron X-ray diffraction