8. Ferromagnetische Resonanz

Frait, Z.

doi:10.1002/pssb.19620021102

Cited by 48 publications

(3 citation statements)

References 127 publications

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“…Consequently, it is possible that the phonon-assisted magnonelectron process, on which equation (1) is based, plays an important role in the ferromagnetic relaxation of Sd-band metals. This conclusion seems to be in agreement with results of Fe [3,61,Co [7], and Xi-576 Cu [30].…”

supporting

confidence: 92%

Damping of ferromagnetic resonance in NiFe alloys

Bastian¹,

Biller²

1976

Phys. Stat. Sol. (a)

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From linewidth data of bulk (110) NiFe alloy single crystals (100 to 45 wt% Ni) at 19.5 and 26 GHz Landau‐Lifshits damping parameters were derived, which, except for 100% Ni, increase with temperature between — 196 °C and the Curie point. The λ values of the alloys are found to be considerably lower than for pure Ni. For 75% Ni, λ shows a very pronounced decrease with increasing degree of order. The λ dependence on frequency, temperature, alloy composition, and state of order is in qualitative agreement with a relaxation model on the basis of spin—orbit effects within a band picture proposed by Kamberský.

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supporting

confidence: 92%

Damping of ferromagnetic resonance in NiFe alloys

Bastian¹,

Biller²

1976

Phys. Stat. Sol. (a)

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“…where w = 2xv is the microwave frequency, H,,, is the externally applied resonance field and y = g p d h is the magnetomechanical ratio. w and H,,, are determined experimentally and g, slightly deviating from the free electron value, is taken from the literature (g(Ni) = 2.20, g(60Ni/ 40Fe) = 2.10, g(Fe) = 2.10 [25,26,66,69]). In this way, a total anisotropic field H , = Z H i including all magnetic anisotropic contributions to the total Helmholtz energy A = Z Ai is obtained experimentally by applying Equation (1 2).…”

Section: Ferromagnetic Resonance (Fmr) Condition In Thin Filmsmentioning

confidence: 99%

Magnetic Structures and Stresses in Thin Films II. Thermodynamical Treatment and Discussion

Göpel

1978

Ber Bunsenges Phys Chem

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Using a thermodynamic treatment of thin film magnetism, UHV‐experiments on the ferromagnetic resonance of Fe‐, NiFe‐, and Ni‐thin films in the 2– 50 monolayer range can be evaluated. – The discussion of the results about clean surfaces leads to the following conclusions: (a) Magnetic “dead layers” of Ni can be excluded with an accuracy of 0.2 monolayers. b) Results from the spin wave theory are applicable to explain the temperature and thickness dependence of the saturation magnetization of Ni although the films are not ideal on a microscopical scale, c) Magnetic surface anisotropies can be explained by Néel's phenomenological approach, d) Due to the high magnetostriction of Ni the data are affected by mechanical stresses. Therefore mechanical stresses of thin films can be estimated from experimentally determined magnetic anisotropic fields. Tentatively we describe these effects by simple models including stresses from interfacial energies. thermal expansions and grain boundaries. – Chemisorption of H2 and CO on Ni at T±500 K leads to changes in the surface magnetism: a)“Dead layers” are induced by chemisorption. One hydrogen atom diminishes the contribution of one nickel atom to the thin film ferromagnetism. Twice the effect is found for CO adsorption. b) Magnetic surface anisotropies are reduced. c) Mechanical stresses are reduced too. This effect depends on the coverage of chemisorbed particles, the film thickness and the concentration of crystallite boundaries. Only its lower limit can be estimated using a thermodynamic treatment of reduced surface free energies.

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“…In metals DH increases with frequency f [3]. In the first approximation the linewidth consists [4] of a part DH c caused by magnetic inhomogeneities (slightly dependent on f ) and of the relaxation part DH l directly proportional to f (and also to l). Therefore materials with small DH values are needed for fast sensor applications.…”

Section: Introductionmentioning

confidence: 99%