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Microwave response of amorphous microwires: magnetoimpedance and ferromagnetic resonance

Authors
Journal
Journal of Magnetism and Magnetic Materials
0304-8853
Publisher
Elsevier
Publication Date
Volume
249
Identifiers
DOI: 10.1016/s0304-8853(02)00517-6
Keywords
  • Amorphous Wires
  • Magnetoimpedance
  • Ferromagnetic Resonance
Disciplines
  • Physics

Abstract

Abstract It has been established that giant magnetoimpedance (GMI) in amorphous wires is due to a rapid change in the skin depth, caused by the low-field sensitivity of the azimuthal dynamic permeability (a classical electromagnetic effect). In 5 μ m diameter glass-covered amorphous wires, GMI may be observed at the microwave range. A correlation between GMI and ferromagnetic resonance (FMR) was proposed in this microwave range. We have measured the microwave response of amorphous microwires for several alloys from the system (Co 100− x Fe x ) 75Si 15B 10 ( x=2, 6, 10 ) with positive, zero, and negative magnetostriction, respectively. Our main results indicate: (i) GMI and FMR effects are well separated at different fields, (ii) GMI follows the magnetization process, confirming its classical electromagnetic origin, and (iii) FMR fields are also affected by the skin effect.

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