Superexchange Interactions of (Ba1-xSrx)2Zn2Fe12O22 System Studied by Neutron Diffraction

Utsumi, Shigenori; Yoshiba, Daisuke; Momozawa, Nobuyuki

doi:10.1143/jpsj.76.034704

Cited by 50 publications

(39 citation statements)

References 11 publications

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“…The general trend is similar to that observed for Ba 0.5 Sr 1.5 Zn 2 Fe 12 O 22 . 19,21 RXD from the magnetic spiral is intense and on average about a factor of two smaller than the diffracted intensity at ͑003͒. This is much stronger than the nonresonant x-ray diffracted intensity reported for Ba 0.5 Sr 1.5 Zn 2 Fe 12 O 22 .…”

Section: ͑8͒mentioning

confidence: 66%

Circularly polarized soft x-ray diffraction study of helical magnetism in hexaferrite

et al. 2010

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Magnetic spiral structures can exhibit ferroelectric moments as recently demonstrated in various multiferroic materials. In such cases the helicity of the magnetic spiral is directly correlated with the direction of the ferroelectric moment and measurement of the helicity of magnetic structures is of current interest. Soft x-ray resonant diffraction is particularly advantageous because it combines element selectivity with a large magnetic cross-section. We calculate the polarization dependence of the resonant magnetic x-ray cross-section ͑electric dipole transition͒ for the basal plane magnetic spiral in hexaferrite Ba 0.8 Sr 1.2 Zn 2 Fe 12 O 22 and deduce its domain population using circular polarized incident radiation. We demonstrate there is a direct correlation between the diffracted radiation and the helicity of the magnetic spiral.Magnetic spiral structures can exhibit ferroelectric moments as recently demonstrated in various multiferroic materials. [1][2][3][4] In such cases the helicity of the magnetic spiral is directly correlated with the direction of the ferroelectric moment and measurement of the helicity of magnetic structures is of current interest. Magnetic spiral structures have been observed directly with neutron diffraction ͑ND͒ and resonant x-ray diffraction ͑RXD͒ 5 as their superstructure gives rise to satellite reflections. With polarized neutron diffraction the chirality of the magnetic structure can be determined, as was first predicted by Blume 6 and achieved by Siratori. 7 Recently this has been particularly insightful for the study of ferroelectric magnetic spiral structures in TbMnO 3 , 8 LiCu 2 O 2 , 9 and CuFe 1−x Al x O 2 10 observing that the chirality of the magnetic structure is manipulated with applied electric field. With circular polarized nonresonant x-ray diffraction the chiral magnetic domain population in holmium has been determined 11 and, very recently, polarization analysis has been used to study the cycloidal magnetic domains in multiferroic TbMnO 3 in its ferroelectric phase. 12 An advantage of RXD is that via tuning the incident energy to a particular absorption edge, element specific magnetism is observed. In the case of transition metals, the L 2,3 edge is particularly insightful because the core electron is excited from the core 2p to the 3d valence states and the ͑empty͒ magnetic states are directly probed. The magnetic cross-section is significant compared to the charge crosssection and soft x-ray resonant diffraction has emerged as a very valuable technique with which to study magnetic and orbital order in transition-metal oxides, in particular to distinguish between charge, orbital, and magnetic order. [13][14][15][16] Correlation between the RXD intensity and the helicity of the magnetic spiral has been demonstrated by imaging of the spiral domains in holmium 17 but a quantitative analysis of the diffracted intensities is missing.In this Brief Report we calculate the polarization dependence of the RXD cross-section and deduce the domain population of the magn...

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Section: ͑8͒mentioning

confidence: 66%

Circularly polarized soft x-ray diffraction study of helical magnetism in hexaferrite

et al. 2010

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“…The iron occupies fully four octahedral sublattices, tetrahedral sublattice in the S block contains fraction g of Zn and 1Àg of Fe, while the opposite holds for the tetrahedral sublattice of the T block. Neutron diffraction carried out recently on a number of single crystals with 0oxo0.8 [2] yielded g between 0.65 and 0.82, though other values of g were reported earlier (see [3] for a list).…”

Section: Introductionmentioning

confidence: 82%

Hyperfine interactions in magnetoelectric hexaferrite system

Kouřil

Chlan

Štěpánková

et al. 2010

Journal of Magnetism and Magnetic Materials

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“…This phenomenon can be understood by the superexchange interactions in the crystal lattice by different sizes of ions. The ionic size of Sr = 1.27Å is smaller than that of Ba = 1.43Å, and as a result, a local lattice deformation around Sr ions leads to a stronger superexchange interaction between Fe-O-Fe due to the change in the bond angles between them [Momozawa 1985, Utsumi 2007.…”

Section: Methodsmentioning

confidence: 99%

Ferrimagnetic Sr<formula formulatype="inline"><tex Notation="TeX">$_{1.5}$</tex></formula>Ba<formula formulatype="inline"><tex Notation="TeX"> $_{0.5}$</tex></formula>Zn<formula formulatype="inline"><tex Notation="TeX">$_2$</tex></formula>Fe<formula formulatype="inline"><tex Notation="TeX"> $_{12}$</tex> </formula>O<formula formulatype="inline"><tex Notation="TeX">$_{22}$</tex> </formula>

et al. 2011

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Single crystals of Sr 1.5 Ba 0.5 Zn 2 Fe 12 O 22 were grown from the flux systems of BaCO 3 , SrCO 3 , and Na 2 CO 3 by a high temperature, slow cooling, flux method. X-ray diffraction confirmed that the crystal structure is an extended single crystalline array of Zn-Y composition with an in-plane easy axis crystallographic orientation. The obtained single crystals were characterized for magnetic and microwave properties. The anisotropy field (H A ) and the in-plane magnetization (σ s ) were 10 kOe and 22.5 emu/g, respectively. Ferrimagnetic resonance (FMR) measurements showed 41 Oe of linewidth ( H) at 10 GHz.Index Terms-Soft magnetic materials, hexagonal ferrite, single crystal, planar anisotropy, and ferrimagnetic resonance.

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Superexchange Interactions of (Ba_1-xSr_x)₂Zn₂Fe₁₂O₂₂ System Studied by Neutron Diffraction

Cited by 50 publications

References 11 publications

Circularly polarized soft x-ray diffraction study of helical magnetism in hexaferrite

Circularly polarized soft x-ray diffraction study of helical magnetism in hexaferrite

Hyperfine interactions in magnetoelectric hexaferrite system

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