Contribution of Fe2+, Mn3+and Fe3+ions to the magnetic anisotropy of MgxMn0.6Fe2.4-xO4

Gerber, R.; Elbinger, G.

doi:10.1088/0022-3719/3/6/019

Cited by 42 publications

(14 citation statements)

References 21 publications

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“…The present model provides another probable mechanism which is favourable for the explanation of the low-temperature behaviour of these iron-rich ferrites. I n Mg,Mn0.6Fe2.4-,0~ system, as mentioned already, Gerber and Elbinger found the positive anisotropy constant for Fez+ ions over the whole temperature range of measurement, monotonically decreasing with increasing temperature [6]. The temperature dependence may be interpreted by taking a large value for E, as seen by the curve for E = 500 cm-l in Fig.…”

Section: Y3 + Y4supporting

confidence: 67%

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Contribution of the Fe²⁺ ion to the magnetic anisotropy constant in ferrites

Watanabe

Urade

Saitô

1978

Physica Status Solidi (b)

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The magnetic anisotropy constant Kl originating from the presence of Fe2+ ions in ferrites is calculated, using the theory of Wolf, for a case that the electron hopping between FeS+ and Fea+ ions is allowed within a cluster of iron ions around some lattice defects. The calculated value of Kl exhibits a characteristic temperature dependence, i.e. the change of the sign from positive a t lower temperatures to negative at higher temperatures. It is ahown that the result well agrees with the Fez+ contribution to Kl estimated from the available data of the anisotropy constant for the Nil -zFe2+z04 system.Die magnetische Anisotropiekonstante Ill in Ferriten, die in der Existenz der Fe2+-Ionen ihre Ursache hat, wird fur den Fall, daD die Elektronenwanderung von Fe2+-zu Fe3+-Ionen in einem Cluster von einigen Eisenionen um einen Gitterdefect erlaubt ist, mit der Theorie von Wolf bereohnet. Die Ergebnisse dieser Rechnungen zeigen eine charakteristische Temperaturabhiingigkeit von K,, d. h. eine Bnderung des Vorzeichens von plus bei tiefen Temperaturen zu minus fur hohere Temperaturen. Es wird gezeigt, diLB diese Ergebnisse mit dem Fe2+-Beitrag zu K,, der aus der bekannten GroDe der Anisotropiekonstante fur das System Nil -zFe2 +$04 abgeschatzt wurde, recht gut ubereinstimmt.

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Section: Y3 + Y4supporting

confidence: 67%

“…f --f l), equation (7) reduces t o the formula that has been derived by neglecting the effect of electron migration between Fe2+ and Fe3+ ions [6]. I n the case of E = 0, on the other hand, it is obvious that ( 5 ) coincides with (4).…”

Section: Y3 + Y4mentioning

confidence: 91%

Contribution of the Fe²⁺ ion to the magnetic anisotropy constant in ferrites

Watanabe

Urade

Saitô

1978

Physica Status Solidi (b)

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“…In the calculation of K 1 of present ferrites, c was taken as À 3/4 since K 1 for Mg-Mn ferrite is known to be negative [42,43]. It is seen from Fig.…”

Section: Initial Permeabilitymentioning

confidence: 99%

Effect of In3+ ions doping on the structural and magnetic properties of Mg0.2Mn0.5Ni0.3InxFe2−xO4 spinel ferrites

Verma¹,

Chand²,

Singh

2012

Journal of Magnetism and Magnetic Materials

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“…A value of the exchange field corresponding to g 0 B H ex ϭ100 meV would explain the experimental value of K 1 ϭ2.7ϫ10 Ϫ5 eV. 42 The calculations have been performed using a spin-orbit parameter 3d that is 80 % of the spin-orbit parameter that was obtained for the free ion. 20 Without this reduction of the spin-orbit parameter it is not possible to explain the experimental value of K 1 , since it would require unrealistically high exchange fields ͑see Fig.…”

Section: Results For Specific Materialsmentioning

confidence: 99%

Single-ion anisotropy of localized-electron compounds

2001

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We present a computational analysis of the influence of taking the full multiplet structure into account in calculations of the single-ion contribution to the magnetocrystalline anisotropy ͑MCA͒ of 3d transition-metal ͑TM͒ ions in localized-electron compounds at Tϭ0 K. For atoms with d n (nϭ1 -4,6-9) configurations, at sites with a local cubic, tetragonal, or trigonal symmetry the single ion MCA on the basis of the Hund's rule ground state term only ͓crystal field ͑CF͒ theory͔ is compared with the single-ion MCA on the basis of a fully relativistic first principles atomic theory including the intra-atomic d-d interaction. Solid state effects are taken into account by effective crystal fields and the exchange field. Under certain, realistic, conditions the use of the full multiplet theory is shown to have a significant effect on the calculated single-ion MCA. We also discuss the effect on the overall cubic anisotropy constants for cubic crystals containing transition metal atom sublattices for which the d-metal atoms are located on sites with a local tetragonal and trigonal symmetry. Possible refinements of the theory are discussed.

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Contribution of Fe²⁺, Mn³⁺and Fe³⁺ions to the magnetic anisotropy of Mg_xMn_0.6Fe_2.4-xO₄

Cited by 42 publications

References 21 publications

Contribution of the Fe²⁺ ion to the magnetic anisotropy constant in ferrites

Contribution of the Fe²⁺ ion to the magnetic anisotropy constant in ferrites

Effect of In3+ ions doping on the structural and magnetic properties of Mg0.2Mn0.5Ni0.3InxFe2−xO4 spinel ferrites

Single-ion anisotropy of localized-electron compounds

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Contribution of Fe2+, Mn3+and Fe3+ions to the magnetic anisotropy of MgxMn0.6Fe2.4-xO4

Cited by 42 publications

References 21 publications

Contribution of the Fe2+ ion to the magnetic anisotropy constant in ferrites

Contribution of the Fe2+ ion to the magnetic anisotropy constant in ferrites

Effect of In3+ ions doping on the structural and magnetic properties of Mg0.2Mn0.5Ni0.3InxFe2−xO4 spinel ferrites

Single-ion anisotropy of localized-electron compounds

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Contribution of Fe²⁺, Mn³⁺and Fe³⁺ions to the magnetic anisotropy of Mg_xMn_0.6Fe_2.4-xO₄

Contribution of the Fe²⁺ ion to the magnetic anisotropy constant in ferrites

Contribution of the Fe²⁺ ion to the magnetic anisotropy constant in ferrites