Spin wave resonance in thin films and in bulk samples of FeNi invar alloys

Kordecki, R.; Kochmann, T.; Völz, Hans G.; Pelzl, J.; Becker, Egon; Dumpich, G.

doi:10.1016/0921-4526(89)90150-6

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…Dita magnetização aumenta com a espessura dos filmes, sendo máxima para o filme de 70 nm por causa da anomalia no seu campo de ressonância (Tabela 3.2). O valor da magnetização efetiva para o filme de 30 nm (1413 emu/cm 3 ≈ 1.4 × 10 6 A/m), corresponde-se com o valor experimental esperado, obtido em outros trabalhos para filmes deste tipo de ligas, onde as estruturas fcc e bcc surgem no mesmo tempo [91].…”

Section: Resultsunclassified

“…sendo A ∼ 10 −6 erg/cm a constante de troca reportada na literatura [91,93] e M s a magnetização de saturação. O comprimento de troca é um parâmetro que determina um limite abaixo do qual as interações de troca no material são mais intensas que as interações magnetostáticas [94], e em simulações tridimensionais de microestruturas magnéticas, define o tamanho favorável das células usadas para a discretização dos problemas.…”

Section: Espessura (Nm) M S (Emu/cmunclassified

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Análise das microestruturas magnéticas em filmes de FeNi

Castro¹

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The present work reports structural and magnetic study of FeNi polycrystalline films on Si substrates. X-ray dispersive energy measurements indicated relative concentrations of 64 % iron and 36 % nickel, which means that the films present Invar concentration, a phenomenon characterized by the decrease of the thermal expansion coefficient of the alloy to very low values. Experimental studies show that this phenomenon is strongly related to the magnetic structure of the alloys, but current theoretical models still cannot fully explain the relation between magnetic and mechanical characteristics of Invar alloys, motivating continued studies on their magnetic properties.In this research, the micromagnetic configuration for three FeNi films in Invar concentration and three different thicknesses (30, 70 and 140 nm) is analyzed according to their thicknesses. Experimental techniques such as SQUID magnetometry and Magnetic Force Microscopy (MFM) were used, as well as computer simulations, to offer more experimental bases that contribute to the understanding of the phenomena present in FeNi36 Invar alloys.Results revealed magnetic inhomogeneities caused by film polycrystallinity. The samples also showed a soft ferromagnetic behavior, with increasing saturation magnetizations and effective anisotropies with increasing thicknesses. Results also showed a great influence of shape anisotropy so that the films are easily magnetized in-plane.Finally, magnetometry measurements were complemented by micromagnetic structure mapping by Magnetic Force Microscopy, the resulting magnetic images were later simulated with the software MUMAX3. The maps revealed domains with local magnetizations parallel to the surface of the films, while the walls have a Bloch-like structure, mainly inside the thicker films. In this way, the anisotropy of the material defines an easy axis of magnetization in the plane of the films, because of the shape anisotropy, which forces the domain walls to distribute in the films, forming irregular zigzag like patterns on the surface.

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Section: Resultsunclassified

Section: Espessura (Nm) M S (Emu/cmunclassified

Análise das microestruturas magnéticas em filmes de FeNi

Castro¹

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Spin wave resonance in FeNi multilayers

Kordecki¹,

Meckenstock²,

Pelzl³

et al. 1991

Journal of Magnetism and Magnetic Materials

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Magnetic-field dependence of spin waves in ordered permalloy nanowire arrays in two dimensions

Liu

Wang

Lim

et al. 2005

Journal of Applied Physics

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The longitudinal magnetic-field dependence of quantized spin waves in ordered permalloy nanowire arrays in two dimensions (2D) has been studied by Brillouin spectroscopy. The results were analyzed on the basis of collective spin waves in a hexagonal 2D nanowire array and compared with the results obtained from an analysis of spin waves in an isolated wire. It is found that only the lowest-frequency spin-wave mode of an isolated nanowire is marginally influenced by the presence of neighboring nanowires. These findings are significant for the theoretical understanding and the future technological utilization of magnetic nanowires.

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Spin wave resonance in thin films and in bulk samples of FeNi invar alloys

Cited by 4 publications

References 6 publications

Análise das microestruturas magnéticas em filmes de FeNi

Análise das microestruturas magnéticas em filmes de FeNi

Spin wave resonance in FeNi multilayers

Magnetic-field dependence of spin waves in ordered permalloy nanowire arrays in two dimensions

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