Nuclear Magnetic Resonance of Fe57 in BaFe12O19

Hareyama, K.; Kohn, Kay; Uematsu, K.

doi:10.1143/jpsj.29.791

Cited by 15 publications

(2 citation statements)

References 2 publications

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“…The magnetic moments in these sublattices can not form collinear structures both along and orthogonal to the hexagonal axis, as follows from the group-theoretical analysis. In works on the magnetic structure of M-hexaferrites, the apex angle of the magnetic moment cone in the k-sublattice is not indicated anywhere, although this follows from the temperature dependence of the magnetic moment (Hareyama et al, 1970;Albanese et al, 1974;Isalgué et al, 1986). A consequence of noncollinearity may be (possibly) the observed decrease in the total magnetic moment with a change in temperature due to the rotation of the cone of the magnetic moment, for example, in the k-sublattice of the M-hexaferrite structure upon substitution (Ivanov et al, 2017;Hilczer et al, 2019).…”

Section: Discussionmentioning

confidence: 99%

Ferromagnetoelectric phases of hexaferrites: a group-theoretical analysis

Широков¹,

Razumnaya²,

Mikheykin³

2021

Acta Crystallogr Sect B

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A symmetry-guided approach for designing and tailoring magnetoelectric and multiferroic hexaferrites is proposed. A group-theoretical study of the magnetoferroelectric structures of a hexagonal ferrite was carried out. The results were applied to M-, W- and Z-type hexaferrites. It is shown that the magnetic structure cannot be collinear in the main magnetic phase, with the direction of the magnetic moment along the hexagonal axis. Magnetic sublattices are shown in which cation substitution should lead to the formation of a multiferroic state. A thermodynamic model of a hexagonal ferroelectric ferrimagnet was constructed, in which isostructural phase transitions were observed.

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Section: Discussionmentioning

confidence: 99%

Ferromagnetoelectric phases of hexaferrites: a group-theoretical analysis

Широков¹,

Razumnaya²,

Mikheykin³

2021

Acta Crystallogr Sect B

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“…The NMR peak positions are consistent with those shown in previous studies for M-type Ba and Sr ferrites. 12,13,[18][19][20][21] The site assignments of the NMR peaks are denoted in Fig. 2.…”

Section: Wyckoff Notation Oxygen Coordination Moment Direction 2amentioning

confidence: 99%

Occupation sites and valence states of Co dopants in (La, Co)-codoped M-type Sr ferrite: Fe57 and Co59 nuclear magnetic resonance studies

et al. 2018

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To specify preferential occupation sites of Co substituents and to clarify charge and spin states of Co ions in (La, Co)-cosubstituted hexagonal magnetoplumbite-type (M-type) Sr ferrite Sr1−xLaxFe12−yCoyO19 (x, y ≤ 0.4), 57 Fe and 59 Co nuclear magnetic resonance (NMR) spectra are measured under zero and external magnetic fields using powdered and single crystalline specimens. For comparison, NMR investigations of non-doped and La-or Co-doped M-type Sr ferrites are also performed. Ferrimagnetic M-type Sr ferrite contains the following five crystallographic Fe sites: the majority spin sites 12k, 2a, and 2b, and the minority spin sites 4f1 and 4f2. Based on 57 Fe and 59 Co NMR, a plausible model of (La, Co)-codoped Sr ferrite is deduced. To a considerable degree, the charge compensation between La 3+ and Co 2+ works in the equal (La, Co)-codoped case, where more than half of the Co ions are considered to be present in the minority spin 4f1 sites at the center of the oxygen tetrahedra, with the S=3/2 state carrying a small orbital moment owing to spin-orbit interaction. The remaining small number of high-spin Co 2+ (S=3/2, L=1) ions with unquenched orbital moments would be distributed to the other octahedral 12k, 2a, and 4f2 sites.

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5.16 References for 5

Bonnenberg¹,

Hempel²,

Roos³

Landolt-Börnstein - Group III Condensed Matter

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Nuclear Magnetic Resonance of Fe⁵⁷ in BaFe₁₂O₁₉

Cited by 15 publications

References 2 publications

Ferromagnetoelectric phases of hexaferrites: a group-theoretical analysis

Ferromagnetoelectric phases of hexaferrites: a group-theoretical analysis

Occupation sites and valence states of Co dopants in (La, Co)-codoped M-type Sr ferrite: Fe57 and Co59 nuclear magnetic resonance studies

5.16 References for 5

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