Distribution of Zn in Magnetoelectric Y-Type Hexaferrite

Kouřil, Karel; Chlan, V.; Štěpánková, H.; Telfah, Ahmad; Novák, P.; Knı́žek, K.; Hiraoka, Yoshiki; Kimura, T.

doi:10.12693/aphyspola.118.732

Cited by 9 publications

(6 citation statements)

References 5 publications

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“…One should note from Table I that the crystal sites are inuenced differently by γ; the resonance frequency of 3a V I and 3b V I lines depends strongly on γ while e.g., 18h IV is practically unaected. The value γ = 0.65 is taken from our previous 67 Zn NMR study [4] and matches well with a value of γ = 0.62 that would yield the best agreement for our current The calculated frequencies for γ = 0.65 are displayed in Fig. 1 together with the experimental 57 Fe NMR spectra.…”

Section: Resultssupporting

confidence: 80%

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Study of Y-type Hexaferrite by Means of ^{57}Fe NMR and Electronic Structure Calculations

Chlan

Kouřil²,

Štěpánková³

et al. 2014

Acta Phys. Pol. A

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The electron structure and site preferences of Zn and Fe cations in Y hexaferrite system were calculated. The hyperne magnetic elds on 57 Fe nuclei were determined using WIEN2k and corrections for hyperne contact interaction. The calculated elds were compared to 57 Fe nuclear magnetic resonance (NMR) experiment in Ba2Zn2Fe12O22 single crystal with an aim of interpretation of experimental NMR spectrum.

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Section: Resultssupporting

confidence: 80%

“…The zinc preference for 6c IV sites is relatively independent of the large cations. Zn NMR study [4].…”

Section: Resultsmentioning

confidence: 99%

Study of Y-type Hexaferrite by Means of ^{57}Fe NMR and Electronic Structure Calculations

Chlan

Kouřil²,

Štěpánková³

et al. 2014

Acta Phys. Pol. A

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“…There are two octahedral sites in the T block and one in the S block; the octahedral site h having the highest multiplicity is common for both the T and S blocks. For example, the Mg 2+ ions occupy randomly tetrahedral and octahedral sites in Ba 2 Mg 2 Fe 12 O 22 , whereas the Zn 2+ cations would rather be positioned in tetrahedral sites as the Fe 3+ cations . To understand and design the magnetic and other physical properties, it is necessary to have information on the material’s crystalline structure, on the ions’ distributions, and on the interactions between the cations occupying different sites.…”

Section: Crystal and Magnetic Structurementioning

confidence: 99%

“…For example, the Mg 2+ ions occupy randomly tetrahedral and octahedral sites in Ba 2 Mg 2 Fe 12 O 22 , 12 whereas the Zn 2+ cations would rather be positioned in tetrahedral sites as the Fe 3+ cations. 13 To understand and design the magnetic and other physical properties, it is necessary to have information on the material’s crystalline structure, on the ions’ distributions, and on the interactions between the cations occupying different sites. The earliest considerations regarding the possible spin arrangement in the Y-type hexaferrite structure date as far back as the 1950s.…”

Section: Crystal and Magnetic Structurementioning

confidence: 99%

Phase Transitions in Magneto-Electric Hexaferrites

et al. 2022

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Hexaferrites have long been the object of extensive studies because of their great possibility for applications�permanent magnets, highdensity recording media, microwave devices, in biomedicine, to name but a few. Lately, many researchers' efforts have been focused on the existence of the magneto-electric effect in some hexaferrite systems and the appealing possibility of them being used as single-phase multiferroic and magnetoelectric materials. As indicated by theoretical analyses, the origin of the large magneto-electric effect can be sought in the strong interaction between the magnetization and the electric polarization that coexist in insulators with noncollinear magnetic structures. The hexaferrites' magnetic structure and, particularly, the specific magnetic spin ordering are the key factors in observing magneto-electric phases in hexaferrites. Some of these phases are metastable, which hampers their direct practical use. However, as the hexaferrites' phase diagrams reveal, chemical doping can be used to prepare a number of noncollinear stable magnetic phases. Since the magneto-electric effect has to do with the magnetic moments ordering, it seems only logical that one should study the cation substitutions' influence on the magnetic phase transition temperature. In this paper, we summarize recent examples of advances in the exploration of magnetic phase transitions in Y-type hexaferrites. In particular, the effect is emphasized by substituting in Y-type hexaferrites the nonmagnetic Me 2+ cations with magnetic ones and of the magnetic Fe 3+ cations with nonmagnetic ones on their magnetic properties and magnetic phase transitions. The work deals with the structural properties of and the magnetic phase transitions in a specific Y-type hexaferrite, namely, Ba(Sr) 2 Me 2 Fe 12 O 22 .

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“…The barium hexaferrite (BaFe 12 O 19 ) is known as a hard magnetic material and represents one of the mostly used materials in the area of magnetic recording media, which cannot be easily substituted by other magnets [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Structural Investigations and Magnetic Properties of BaFe₁₂O₁₉Crystals

et al. 2012

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This work was dedicated to the preparation of a barium hexaferrite using the glass crystallization method. The glass flakes were treated at temperatures ranging between 550• C and 750• C. The investigation carried out by X-ray diffraction revealed the phase composition and the mean crystallite size. By means of the scanning electron microscopy, the crystallite shape and average size were established. The electric and magnetic properties were investigated at room temperature by means of a Solartron 1260A impedance/gain phase analyzer and a vibrating sample magnetometer. The optimum heat treatment was established to obtain the maximum coercivity of the barium hexaferrite.

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Distribution of Zn in Magnetoelectric Y-Type Hexaferrite

Abstract: We employ 67 Zn NMR to study distribution of Zn 2+ in cationic sites of magnetoelectric Y-type hexaferrite single crystal, Ba 0.5 Sr 1.5 Zn 2 Fe 12 O 22 . The experimental data are interpreted by comparison with NMR spectra simulated from ab initio calculated hyperfine parameters.

Cited by 9 publications

References 5 publications

Study of Y-type Hexaferrite by Means of ^{57}Fe NMR and Electronic Structure Calculations

Study of Y-type Hexaferrite by Means of ^{57}Fe NMR and Electronic Structure Calculations

Phase Transitions in Magneto-Electric Hexaferrites

Structural Investigations and Magnetic Properties of BaFe₁₂O₁₉Crystals

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Distribution of Zn in Magnetoelectric Y-Type Hexaferrite

Abstract: We employ 67 Zn NMR to study distribution of Zn 2+ in cationic sites of magnetoelectric Y-type hexaferrite single crystal, Ba 0.5 Sr 1.5 Zn 2 Fe 12 O 22 . The experimental data are interpreted by comparison with NMR spectra simulated from ab initio calculated hyperfine parameters.

Cited by 9 publications

References 5 publications

Study of Y-type Hexaferrite by Means of ^{57}Fe NMR and Electronic Structure Calculations

Study of Y-type Hexaferrite by Means of ^{57}Fe NMR and Electronic Structure Calculations

Phase Transitions in Magneto-Electric Hexaferrites

Structural Investigations and Magnetic Properties of BaFe12O19Crystals

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Product

Resources

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Structural Investigations and Magnetic Properties of BaFe₁₂O₁₉Crystals