<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Fe</mml:mi><mml:mprescripts /><mml:none /><mml:mn>57</mml:mn></mml:mmultiscripts></mml:math>NMR and spin structure of manganese ferrite

Štěpánková, H.; Sedlák, B.; Chlan, V.; Novák, P.; Šimša, Z.

doi:10.1103/physrevb.77.092416

Cited by 8 publications

(14 citation statements)

References 7 publications

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“…10 One is a collinear model supported by nuclear magnetic resonance (NMR) experiments with magnetic moment of 5 l B for the Fe 3þ ions at A site and 4 l B for both the Fe 2þ and Mn 3þ ions at B site. 12 The other is a canted model proposed from the results of M€ ossbauer experiments as only minute quantity of Fe 2þ ions was detected. 7,10 The proposed Mn 2þ ions at B site were assumed canting about 53 to the Fe 3þ ions at B site, which are antiparallel to the moments of Fe 3þ at A site, and contribute a total of 3 l B =fu to the inverse phase of the material.…”

Section: Introductionmentioning

confidence: 99%

Cation and magnetic orders in MnFe2O4 from density functional calculations

Huang¹,

Cheng²

2013

Journal of Applied Physics

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MnFe 2 O 4 generally crystallizes in a mixed phase consisting of both the normal and inverse spinel structures with the fitted experimentally determined saturation moments of 5 and 3 l B per formula, respectively. Employing the density-functional methods with the generalized gradient approximation for the exchange-correlation energy functional and the on-site Coulomb effect (GGAþU), we have studied this material through exploring various cation distributions and magnetic orders of the system. We demonstrate that the magnetic moment can be accounted for by the high-spin Mn 2þ cations at the tetrahedral site in the normal spinel structure and by the intermediate-spin Mn 2þ cations at the octahedral site in the inverse spinel structure. That is, the results support the single-valence state for this material. The corresponding energetics, exchange interactions, and electronic properties are also presented and discussed. V C 2013 American Institute of Physics.

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Section: Introductionmentioning

confidence: 99%

Cation and magnetic orders in MnFe2O4 from density functional calculations

Huang¹,

Cheng²

2013

Journal of Applied Physics

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“…reveal saturation of 5 and 3 μ B per formula unit for a normal and inverse spinel, respectively, which was confirmed by Simsa and Brabers experimentally [15,34] . This can be correlated to spin canting phenomena and/or mixed valence [35,36] . Spin canting describes the phenomenon that especially the spins of surface ions feature different orientations leading to altered magnetic moments.…”

Section: Introductionmentioning

confidence: 61%

“…[15,34] This can be correlated to spin canting phenomena and/or mixed valence. [35,36] Spin canting describes the phenomenon that especially the spins of surface ions feature different orientations leading to altered magnetic moments. This effect is especially observed in nanostructures due to the finite-size effect.…”

Section: Introductionmentioning

confidence: 99%

Magnetic properties and structural analysis on spinel MnFe₂O₄ nanoparticles prepared via non‐aqueous microwave synthesis

Simon

Blößer

Eckardt

et al. 2021

Zeitschrift anorg allge chemie

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Dedicated to Prof. Dr. Josef Breu on the occasion of his 60th birthdayPhase-pure 6 nm spinel MnFe 2 O 4 nanoparticles with high specific surface area of 145 m 2 g À 1 were successfully prepared via microwave-assisted non-aqueous sol-gel synthesis. The phase evolution during postsynthetic thermal treatment was investigated systematically by various methods, including powder X-ray diffraction (PXRD), pair distribution function (PDF) analysis, and Raman spectroscopy. Our results show that the material decomposes to non-spinel binary compounds α-Mn 2 O 3 and α-Fe 2 O 3 at temperatures between 400 and 600 °C. The application potential of MnFe 2 O 4 nanoparticles with 3d 5 Mn(II) and Fe(III) ions with respect to the magnetic properties was demonstrated by superconducting quantum interference device (SQUID) magnetometry, with the as-synthesized nanoparticles reaching a high saturation magnetization of 2.62 μ B per formula unit (63.5 Am 2 kg À 1 ) at 10 K. We further highlight the visiblelight response of synthesized powders, making the materials promising for light-related applications, e. g. photocatalytic hydrogen evolution. An important additional feature of MnFe 2 O 4 nanoparticles is their good dispersibilty in polar or non-polar media, as a result of postsynthetic colloidal stabilization with betaine hydrochloride, oleic acid combined with oleylamine, or citric acid.

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“…Nishihara et al [102] performed field-swept NMR measurements on 59 Co, 51 V, 121 Sb and 123 Sb nuclei. The hyperfine fields as a function of the magnetization show a linear dependence and the hyperfine field coupling constants are found to be −34.9 kOe/µ B ( 59 Co) and −15.7 kOe/µ B ( 51 V).…”

Section: C1 B Heusler Compoundsmentioning

confidence: 99%

Nuclear magnetic resonance studies of materials for spintronic applications

Wurmehl¹,

Kohlhepp

2008

J. Phys. D: Appl. Phys.

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Since its discovery in liquids and also in solid matter in 1946, nuclear magnetic resonance (NMR) has been widely established as a standard tool for structural analysis of a wide range of materials. This review outlines recent NMR studies on materials considered to be useful in spintronic applications. Spintronics is a new research field which combines the use of both the charge and the spin of an electron as information carriers, which promises distinct advantages over conventional electronics which makes use only of the charge of electrons. A successful application of materials in spintronic devices requires a detailed knowledge of the interplay between the structure and the magnetic and electronic properties on an atomic scale. NMR probes the local environments of the active nuclei. This local character of NMR arises from local contributions to the hyperfine field, namely, the transferred field which depends on the nearest neighbour atoms and their magnetic moments. This enables NMR to study the structural properties of bulk samples as well as of thin films of spin polarized materials. Moreover, NMR spectroscopy also provides an indirect tool to measure the density of states of spin polarized materials via a measurement of the temperature dependence of the spin–lattice relaxation time. This review starts with an introduction into the basic concepts of NMR followed by a description of the important aspects of a pulsed NMR experiment. Thereafter, information obtained by an NMR experiment is addressed. In the subsequent main part, selected recent NMR studies (published roughly after the year 2000) of materials for spintronic applications are presented including NMR studies of, for example, Co thin films, Heusler compounds, double perovskites and pyrites.

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Fe57NMR and spin structure of manganese ferrite

Cited by 8 publications

References 7 publications

Cation and magnetic orders in MnFe2O4 from density functional calculations

Cation and magnetic orders in MnFe2O4 from density functional calculations

Magnetic properties and structural analysis on spinel MnFe₂O₄ nanoparticles prepared via non‐aqueous microwave synthesis

Nuclear magnetic resonance studies of materials for spintronic applications

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Fe57NMR and spin structure of manganese ferrite

Cited by 8 publications

References 7 publications

Cation and magnetic orders in MnFe2O4 from density functional calculations

Cation and magnetic orders in MnFe2O4 from density functional calculations

Magnetic properties and structural analysis on spinel MnFe2O4 nanoparticles prepared via non‐aqueous microwave synthesis

Nuclear magnetic resonance studies of materials for spintronic applications

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Product

Resources

About

Magnetic properties and structural analysis on spinel MnFe₂O₄ nanoparticles prepared via non‐aqueous microwave synthesis