Valve-like behavior of the magnetoimpedance in the GHz range

Sandacci, S.; Makhnovskiy, D. P.; Panina, L.V.

doi:10.1016/j.jmmm.2003.12.829

Cited by 42 publications

(30 citation statements)

References 10 publications

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“…The corresponding change of wire impedance (the giant magnetoimpedance) is used in magnetic sensors, though their operating frequency does not exceed several megahertz [11]. The recent reports show that the impedance change decreases with frequency, but it is observed up to 1-1.6 GHz [28,29]. We observe the similar effect at 6 GHz (Fig.…”

Section: Resultssupporting

confidence: 67%

Microwave Screen With Magnetically Controlled Attenuation

Starostenko¹,

Rozanov²

2009

PIER

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Abstract-The effect of magnetic bias on dielectric spectra of composite sheets filled with Fe or Co-based microwires is studied experimentally and via simulation. The permittivity is measured using a free-space technique within the frequency band from 6 to 12 GHz. The bias is applied either parallel or perpendicular to the microwave electric field; the bias strength varies from 0 to 2.5 kOe. The composites with Fe-based wires reveal a single region of bias dependent permittivity under bias about 800-1000 Oe. The composites with Cobased wires reveal two such regions: the high-field region is close to that of composites with Fe wires, and the low-field region corresponds to the coercive field of Co wires (2-3 Oe). The high-field effect is related to the dependence of ferromagnetic resonance (FMR) parameters on bias; the low-field effect is related to the rearrangement of the domain structure of Co-based wires. The interference of magnetoimpedance and dipole resonance is analyzed, revealing the effects off wire length, diameter, parameters of magnetic resonance and composite structure. The results are considered in view of application to the problem of controlled microwave attenuation. Simulation shows that the narrower is the FMR spectrum and the higher is the admissible loss of a sheet in a transparent state, the wider is the dynamic range of attenuation control. The attenuation range of a lattice of continuous wires is smaller than that of a screen with identical wire sections, where the magnetoimpedance effect is amplified resonantly. At 15 GHz frequency the strength of the bias switching opaque sheet with Fe-based wires to the transparent state is about 2000 Oe. For 3 dB admissible loss, the range of attenuation control about 10 dB is feasible in a composite with aligned wire sections. If the aligned sections are distributed regularly, the loss in a transparent state is about 1 dB lower.

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Section: Resultssupporting

confidence: 67%

Microwave Screen With Magnetically Controlled Attenuation

Starostenko¹,

Rozanov²

2009

PIER

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“…2 depicts the field dependence of absorption of wire A at varied stresses ranging from 37 MPa to 1263 MPa. When stress is no more than 371 MPa, the absorption shows strong field dependence and the applied field increases the absorption till saturation in analogy to the valve-like GMI profiles [19]. At = 743 MPa, the single peak feature becomes obscured with the less influence of magnetic field.…”

Section: Resultsmentioning

confidence: 88%

Stress tunable microwave absorption of ferromagnetic microwires for sensing applications

Qin

Попов

Peng

2011

Journal of Alloys and Compounds

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“…However, the theoretical and experimental analysis conducted in [4][5][6][7] has shown that eff  changes very little with both the external axial magnetic field ex H and anisotropy field K H for frequencies much higher than the ferromagnetic resonance, although preserving its relatively high values (in the range of tens). Therefore, the dependence of the magnetoimpedance on various external factors such as a dc magnetic field or stress (which changes K H ) will be entirely determined by the static magnetization angle  .…”

Section: Index Terms-magnetoimpedance Ferromagnetic Amorphous Wiresmentioning

confidence: 99%