Power absorption and ferromagnetic resonance in Co-rich metallic glasses

Garcı́a-Miquel, H.; Esbri, M.J.; Andrés, José Onofre Montesa; García, Javier Moreno; Garcı́a-Beneytez, J.M.; Vázquez, M.

doi:10.1109/20.914378

Cited by 37 publications

(27 citation statements)

References 22 publications

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“…12 and the magnetostriction constants. 9 In a recent article, 6 Eq. ͑1͒ was used to interpret what were claimed to be FMR spectra in the present samples at f р8 GHz ͑Fig.…”

Section: Discussionmentioning

confidence: 99%

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Microwave magnetoabsorption in glass-coated amorphous microwires with radii close to skin depth

Lofland

Garcı́a-Miquel

Vázquez

et al. 2002

Journal of Applied Physics

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Lofland, S.; García Miquel, ÁH.; Vázquez, M.; Bhagat, S. (2002). Microwave magnetoabsorption in glass-coated amorphous microwires with radii close to skin depth. Journal of Applied Physics. 92(4): 2058-2063. doi:10.1063/1.1494847 Microwave magnetoabsorption in glass-coated amorphous microwires with radii close to skin depth ͑͒We present the frequency dependence of microwave magnetoabsorption in glass-coated amorphous microwires of (Co 100Ϫx Fe x ) 72.5 Si 12.5 B 15 . The data were taken at room temperature in the frequency range of 1-60 GHz for field up to 15 kOe by either a cavity perturbation technique or a coaxial transmission line. The resulting spectra strongly depend upon the local microwave magnetic and electric fields We have found that we can simulate the spectra using an analytic solution to the problem of electromagnetic scattering from a cylinder. We demonstrate that these unusual spectra can be interpreted in terms of ferromagnetic resonance and antiferromagnetic resonance. However, because the electromagnetic skin depth is comparable to the radius, the resonance and antiresonance field do not follow the conventional equations.

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“…12 and the magnetostriction constants. 9 In a recent article, 6 Eq. ͑1͒ was used to interpret what were claimed to be FMR spectra in the present samples at f р8 GHz ͑Fig.…”

Section: Discussionmentioning

confidence: 99%

“…10. To summarize, we used a modifie transmission line wherein the dielectric was replaced by several microwires aligned axially rather than the single wire used in the cavity perturbation method, and H was applied along the ''sample.''…”

Section: Methodsmentioning

confidence: 99%

Microwave magnetoabsorption in glass-coated amorphous microwires with radii close to skin depth

Lofland

Garcı́a-Miquel

Vázquez

et al. 2002

Journal of Applied Physics

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“…We also apply a bias field in order to work on the field over the GMI peak, where the hysteresis is negligible. GMI in amorphous microwires has been also studied at microwave frequencies [15,25], and also the absorptive properties due to the phenomenon of Ferromagnetic Resonance (FMR) [26][27][28][29], or the recently experimental demonstration of its behavior as a metamaterial due to the coexistence of negative permittivity and permeability in the frequency region between FMR and Ferromagnetic Antiresonance (FMAR) [30]. This structure allows the possibility of modifying a pass band between FMR and FMAR through an external magnetic field [30] or with a current though the microwire [31], even modulating a microwave signal with an AC current.…”

Section: Introductionmentioning

confidence: 99%

DC and AC linear magnetic field sensor based on glass coated amorphous microwires with Giant Magnetoimpedance

García-Chocano

Garcı́a-Miquel

2015

Journal of Magnetism and Magnetic Materials

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Giant magnetoimpedance (GMI) effect has been studied in amorphous glass-coated microwires of composition (Fe 6 Co 94 ) 72.5 Si 12.5 B 15 . The impedance of a 1.5cm length sample has been characterized by using constant AC currents in the range of 400µA to 4mA at frequencies from 7 to 15MHz and DC magnetic fields from -900 to 900A/m. Double peak responses have been obtained, showing GMI ratios up to 107%. A linear magnetic field sensor for DC and AC field has been designed, using two microwires connected in series with a magnetic bias of 400A/m with opposite direction in each microwire in order to obtain a linear response from ±70 (A/m) rms for AC magnetic field, and ±100 A/m for DC magnetic field. A closed loop feedback circuit has been implemented to extend the linear range to ±1 kA/m for DC magnetic field.

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“…La relación entre potencia reflejada y potencia incidente viene dada por el módulo al cuadrado del parámetro S 11 que se determina experimentalmente. La frecuencia de resonancia se detecta a través de un pico en la absorción de energía, que se desplaza al variar el campo estático H o (9). La ecuación [2] predice una relación cuadrática entre el campo aplicado y la frecuencia de resonancia.…”

Section: Procedimiento Experimentalunclassified

Resonancia ferromagnética en vidrios metálicos

Garcı́a-Miquel¹,

García²,

Garcı́a-Beneytez³

et al. 2000

Bol. Soc. Esp. Ceram. Vidr.

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En el presente trabajo se ha medido la frecuencia de resonancia ferromagnética (FMR) de vidrios metálicos en forma de microhilos de composición (Fe x Co 1-x ) 72.5 Si 12.5 B 15 . Estos microhilos constan de un núcleo magnético de unas 5µm de diámetro y una cobertura de vidrio, siendo el diámetro total de entre 10 y 15 µm según la muestra. La técnica experimental empleada consiste en la sustitución del dieléctrico de una línea de transmisión coaxial por los microhilos a medir, y en la medida de la absorción de potencia a frecuencias de microondas. Para cada muestra se ha ido variando la intensidad de un campo externo de magnetización, provocando la variación de la frecuencia de resonancia. Con estas medidas se ha conseguido establecer la relación entre campo de magnetización y frecuencia de resonancia, y mediante el análisis de los datos obtenidos y contrastados con el modelo teórico propuesto se ha obtenido información del campo de anisotropía de los microhilos. Finalmente, el campo de anisotropía calculado se ha contrastado con el obtenido mediante la medida del ciclo de histéresis quasi-estático. Palabras clave: Resonancia ferromagnética, anisotropía magnética, microhilos amorfos, materiales para microondas. Ferromagnetic Resonance in Metallic GlassesIn the presently work ferromagnetic resonance (FMR) of metallic glasses in microwires form of composition (FexCo1-x)72.5 Si12.5 B15 has been measured. The ferromagnetic resonance frequency of amorphous magnetic microwires has been obtained from power absorption measurements in the microwave frequency range. The experimental technique here employed consists on the replacement of the dielectric of a coaxial transmission line by the sample to be measured. From the evolution of the resonance frequency with a dc applied magnetic field, the anisotropy field of the microwires has been deduced, and successfully compared to that obtained from quasi-static hysteresis loops.Key words: Ferromagnetc resonance, magnetic anisotropy, amorphous microwires, microwave materials. MODELO TEÓRICOEn un material ferromagnético los espines se acoplan para dar como resultado una imanación macroscópica, al menos localmente.Bajo la aplicación de un campo magnético constante H o que sature la muestra, y de un pequeño campo magnético alterno perpendicular con frecuencia en el rango de microondas, se produce un movimiento de precesión de la imanación alrededor de la dirección de aplicación del campo estático. La ecuación de movimiento es:[1] siendo M la imanación, H el campo magnético, γ la constante giromagnética, y µ o la permeabilidad en el vacío. Teniendo en cuenta los factores de forma de la muestra, así como el campo de anisotropía H k de origen magnetoelástico, la solución de la ecuación (1) según [8] proporciona la siguiente expresión para la frecuencia de resonancia ω 0 :[2] INTRODUCCIÓNLos vidrios metálicos son sólidos amorfos conductores que presentan propiedades magnéticas muy interesantes para su aplicación como sensores, colectores de flujo magnético, apantallamiento electromagnét...

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Power absorption and ferromagnetic resonance in Co-rich metallic glasses

Cited by 37 publications

References 22 publications

Microwave magnetoabsorption in glass-coated amorphous microwires with radii close to skin depth

Microwave magnetoabsorption in glass-coated amorphous microwires with radii close to skin depth

DC and AC linear magnetic field sensor based on glass coated amorphous microwires with Giant Magnetoimpedance

Resonancia ferromagnética en vidrios metálicos

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