Giant magnetoimpedance, skin depth, and domain wall dynamics

Author

Valenzuela, Raul ; Betancourt, Israel

Author_Institution

Inst. for Mater. Res., Nat. Univ. of Mexico, Coyoacan, Mexico

Volume

38

Issue

5

fYear

2002

fDate

9/1/2002 12:00:00 AM

Firstpage

3081

Lastpage

3083

Abstract

An analysis of the skin depth in CoFeBSi amorphous ferromagnetic wires, as a function of frequency, is presented, by using the quasi-static value of permeability measured at 100 Hz. At about 30 kHz, the skin depth becomes comparable to the wire´s radius (62.5 μm), which leads to a separation of the giant magnetoimpedance mechanism: domain wall movements for lower frequencies, and spin rotation for higher frequencies. For the latter, ferromagnetic resonance has been observed, which is clearly consistent with the expected magnetization process. On the other hand, both the real and the imaginary parts of permeability (derived from impedance measurements) confirm the former mechanism.

Keywords

amorphous magnetic materials; boron alloys; cobalt alloys; ferromagnetic materials; ferromagnetic resonance; giant magnetoresistance; iron alloys; magnetic domain walls; magnetic permeability; silicon alloys; skin effect; (Co₉₄Fe₆)_72.5B₁₅Si_12.5; 100 Hz; 30 kHz; 62.5 micron; CoFeBSi; CoFeBSi amorphous ferromagnetic wires; domain wall dynamics; domain wall movements; ferromagnetic resonance; frequency dependence; giant magnetoimpedance; higher frequencies; imaginary parts; lower frequencies; magnetization process; quasi-static permeability value; real parts; skin depth; spin rotation; wire radius; Amorphous magnetic materials; Amorphous materials; Frequency; Magnetic analysis; Magnetic domain walls; Magnetic domains; Magnetic separation; Permeability; Skin; Wires;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2002.802135

Filename

1042457