Depth profile of transverse permeability spectrum in an annealed co-based amorphous ribbon

Rheem, Youngwoo; Jin, Lingxia; Yoon, Seok Soo; Kim, C.G.; Kim, C.O.; Shalyguina, E.E.

doi:10.1109/tmag.2003.816018

Cited by 11 publications

(12 citation statements)

References 11 publications

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“…The antiferromagnetic coupling conception allows one to explain the main features of the field and frequency dependences of the exchange-biased asymmetric GMI in field-annealed Co-based amorphous ribbons [7,8,19]. Nevertheless, some experimental data denotes the presence of the ferromagnetic coupling in stress-field annealed Co-based amorphous ribbons (the bias field H b has the same direction as the unidirectional anisotropy field H u ) [20].…”

Section: Resultsmentioning

confidence: 99%

A model for exchange-biased asymmetric giant magneto-impedance in amorphous wires

Buznikov¹,

Yoon²,

Kim³

et al. 2006

J. Phys. D: Appl. Phys.

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A model describing the exchange-biased asymmetric giant magneto-impedance in Jouleheated amorphous wires is proposed. It is assumed that the Joule heating results in the formation of a surface hard magnetic crystalline layer, and the asymmetric giant magnetoimpedance is related to the exchange coupling between the amorphous and crystalline phases.The coupling between the surface layer and the amorphous bulk is described in terms of an effective bias field. The model is based on a simultaneous solution of linearizied Maxwell equations and the Landau-Lifshitz equation. The calculated field and frequency dependences of the wire impedance are in a qualitative agreement with results of the experimental study of the asymmetric giant magneto-impedance in Joule-heated Co-based amorphous wires.

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Section: Resultsmentioning

confidence: 99%

A model for exchange-biased asymmetric giant magneto-impedance in amorphous wires

Buznikov¹,

Yoon²,

Kim³

et al. 2006

J. Phys. D: Appl. Phys.

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“…Indeed, in real ribbons, the domain-walls nucleation has a more complex behavior, and as a result, the hysteresis of the GMI response has been observed. 3,5,6 The calculated GMI profiles are shown in Fig. 2 for two current frequencies f=ω /2π and different values of H b .…”

Section: H H H H H Hmentioning

confidence: 99%

“…3,5 At sufficiently low frequencies, the GMI profile exhibits a drastic steplike change in the impedance near zero field. 3,5,6 Since the behavior is similar to the magnetoresistance of spin valves, this phenomenon has been referred to as "GMI valve." At high frequencies, the GMI profile shows asymmetric two-peak behavior, with the peak at a positive field being higher than the peak at a negative field.…”

mentioning

confidence: 99%

“…At high frequencies, the GMI profile shows asymmetric two-peak behavior, with the peak at a positive field being higher than the peak at a negative field. 6 An attempt to explain the asymmetric two-peak behavior of the GMI in field-annealed ribbons has been reported in the framework of the quasistatic approach 7 and by using a model based on a solution of linearized Maxwell equations and the Landau-Lifshitz equation. 8 However, a theoretical explanation of the GMI valve phenomenon is still missing.…”

mentioning

confidence: 99%

“…The bias field is in the opposite direction to the unidirectional anisotropy in the surface layer. 5,6 In real ribbons, the bias field varies over the ribbon thickness. However, we consider for simplicity that the value of H b and the angle of the bias field ϕ are constant over the ribbon thickness.…”

mentioning

confidence: 99%

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A model for asymmetric giant magnetoimpedance in field-annealed amorphous ribbons

Buznikov

Kim

et al. 2004

Applied Physics Letters

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A phenomenological model for the asymmetric giant magnetoimpedance (GMI) in fieldannealed amorphous ribbons is developed. The effect of a surface crystalline layer on the GMI response is described in terms of an effective bias field appearing due to a coupling between the crystalline layer and amorphous phase. It is shown that the presence of the bias field changes drastically the GMI profile. At low frequencies, the domain-walls motion leads to a steplike change in the GMI response. At high frequencies, the domain-walls motion is damped, and the GMI profile exhibits asymmetric two-peak behavior. The calculated dependences are shown to be in a qualitative agreement with results of experimental studies of the asymmetric GMI in field-annealed Co-based amorphous ribbons.

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Annealing temperature dependence of transverse permeability spectrum in Co-based amorphous ribbon

Jin

Yoon

Rheem³

et al. 2004

phys. stat. sol. (a)

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The Co-rich amorphous ribbon, Co 66 Fe 4 Si 15 B 15 , was annealed in vacuum under the magnetic field of 3 Oe for 8 h at various temperatures, a T , between 473 K and 773 K. The MI spectra were measured in the frequency range between 10 kHz to 10 MHz as a function of a T and the complex transverse permeability spectra were extracted from the MI spectra. The effects of annealing temperature on the magnetization processes are analyzed with static permeabilities and relaxation frequencies of domain-wall motion and magnetization rotation. The static permeabilities show maximum values for the sample annealed around a T = 623 K, where GMI at various frequencies show maximum ratio.

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Depth profile of transverse permeability spectrum in an annealed co-based amorphous ribbon

Cited by 11 publications

References 11 publications

A model for exchange-biased asymmetric giant magneto-impedance in amorphous wires

A model for exchange-biased asymmetric giant magneto-impedance in amorphous wires

A model for asymmetric giant magnetoimpedance in field-annealed amorphous ribbons

Annealing temperature dependence of transverse permeability spectrum in Co-based amorphous ribbon

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