Domain observations of Fe and Co based amorphous wires

Takajo, M.; Yamasaki, J.; Humphrey, F. B.

doi:10.1109/20.281204

Cited by 74 publications

(30 citation statements)

References 4 publications

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“…23 Equations (24a) and (24b) Here, we use the parameters of Co-rich glass-coated wires with a negative magnetostriction and low coercitivity. 4,26 A circular "bamboo-like" domain structure 27 with opposite magnetizations in the adjacent domains exists almost in the entire wire which exhibits nearly a non-hysteretic B-H curve, as shown in Fig. 2 for 0 90 ψ= .…”

Section: Field Dependent Impedance Matrixmentioning

confidence: 96%

Field dependent permittivity of composite materials containing ferromagnetic wires

Makhnovskiy

Panina

2003

Journal of Applied Physics

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A new type of a composite material is proposed, the microwave permittivity of which changes under the effect of a dc magnetic field applied to the whole composite sample.The composite consists of short ferromagnetic wires embedded into a dielectric matrix. A strong field dependence of the permittivity is seen in the vicinity of the antenna resonance, where the dispersion behaviour can experience a transformation from a resonant spectrum to a relaxation one under the effect of the field. This permittivity behaviour owes to a high sensitivity of the ac surface impedance of a ferromagnetic wire to a magnetic field, known as the magneto-impedance (MI) effect. If the resonance-like dispersion behaviour is realised, the real part of the effective permittivity can be made negative past the resonance for wire inclusion concentrations well below the percolation threshold. Applying a magnetic field, the negative peak continuously decreases as the dispersion tends to become of a relaxation type. The effective permittivity is analysed within a one-particle approximation, by considering a wire piece as an independent scatterer and solving the scattering problem with the impedance boundary condition. A magnetic field is assumed to be applied in parallel to the wire. A new integro-differential equation for the current distribution in a wire is obtained, which is valid for the surface impedance matrix of a general form. This work demonstrates a possibility of using the MI effect to design fieldcontrolled composites and band-gap structures.

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Section: Field Dependent Impedance Matrixmentioning

confidence: 96%

Field dependent permittivity of composite materials containing ferromagnetic wires

Makhnovskiy

Panina

2003

Journal of Applied Physics

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“…Taking into account that the giant magneto-impedance effect is mainly a "surface" effect, the investigation of magnetic structure in the outer shell becomes a special meaning. So far, the Kerr effect has been used only to get images of the magnetic domains in the surface areas of the wires [7]. In this case the information about domain structure can be obtained but details of the magnetization reversal process are not displayed.…”

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confidence: 99%

Kerr Effect as Method of Investigation of Magnetization Reversal in Amorphous Wires

Chizhik¹,

Zhukov

Blanco³

et al. 2002

phys. stat. sol. (a)

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Magneto-optical Kerr effect has been employed for the investigation of the magnetization reversal process in Co-rich amorphous wires. The Kerr effect experiments have been performed in a new configuration with circular magnetic field produced by an electric current flowing through the studied wire. Changes of the Kerr effect hysteresis loops after annealing have been found to be related with the magnetic domain structure modification. This modification is attributed to the change of sign of magnetostriction constant.Optical effects, which demonstrate the influence of magnetization on the state of light are known as magneto-optical effects. Two main magneto-optical phenomena are usually distinguished, the Faraday effect and the Kerr effect. The Faraday effect is characterized by the rotation of the polarization plane and the change of the ellipticity when linearly polarized light passes through the magnetized medium. The Kerr effect [1] consists of the rotation of the plane of polarization and the change of the intensity of polarized light reflected from a surface of the magnetized matter. There are three magneto-optical Kerr effects depending on the mutual arrangement of the magnetization and the plane of incidence of the scattered light -polar, longitudinal and transverse. Experimental investigations have shown that the rotation of the polarization or the change of light intensity (depending on the magneto-optical effect configuration) is proportional to the projection of magnetization on one of the three orthogonal axes [2,3]. Based on this relation Kerr effects have been used to get the images of magnetic domains or to obtain magnetization loops.Usually the Kerr effect has been applied to study samples with plane surface. Recently, we have used the Kerr effect to investigate wire-shaped specimens. It is remarkable to note that the study of the magnetic properties of amorphous wires is a topic of great interest because of their outstanding properties, such as single and large Barkhausen jump or giant magneto-impedance effect [4,5]. It is known that the domain structure of the amorphous wire consists of an axially magnetized inner core and the outer shell, in which "maze" or "bamboo" structure can be observed [6]. Taking into account that the giant magneto-impedance effect is mainly a "surface" effect, the investigation of magnetic structure in the outer shell becomes a special meaning. So far, the Kerr

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“…In the outer layer of the wire, an internal stress from quenching coupled with the negative magnetostriction results in a circumferential anisotropy and an alternate left and right circular domain structure [19]. In this case, the circular magnetization processes determining the MI behavior are very sensitive to the axial magnetic field [20,21].…”

Section: Family Of MI Characteristicsmentioning

confidence: 99%

Magnetoimpedance in amorphous wires and multifunctional applications: from sensors to tunable artificial microwave materials

Panina

Makhnovskiy

Mohri

2004

Journal of Magnetism and Magnetic Materials

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Domain observations of Fe and Co based amorphous wires

Cited by 74 publications

References 4 publications

Field dependent permittivity of composite materials containing ferromagnetic wires

Field dependent permittivity of composite materials containing ferromagnetic wires

Kerr Effect as Method of Investigation of Magnetization Reversal in Amorphous Wires

Magnetoimpedance in amorphous wires and multifunctional applications: from sensors to tunable artificial microwave materials

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