Correlation of domain structure with magneto-impedance effect

T. Nakai, K. I. Arai, J. Yamasaki, Masahiro Yamaguchi, Kazushi Ishiyama, Shin Yabukami, K. Takada, H. Abe

Research output: Chapter in Book/Report/Conference proceedingChapter

8 Citations (Scopus)

Abstract

In this chapter, a variation of magnetic domain and correlated magneto-impedance of a micro-fabricated rectangular-shaped magnetic thin film is discussed. In a certain case of the magnetic element, which is made from an amorphous film with in-plane uniaxial anisotropy and low magnetostriction, the Landau-Lifshitz-like magnetic domain is observed. A change in structure of magnetic domain occurs as a function of external magnetic field. The Landau-Lifshitz magnetic domain consists of contiguous domains with anti-parallel magnetic-momentum with existence of closure domains in the edge area of the striped element. The dimensions of the rectangular strip discussed in this chapter, especially the width, must be almost in the same order of the width of a domain area. The high-frequency impedance of the element is determined by the high-frequency permeability, and the permeability is determined by the domain structure, the direction of magnetic moment in each domain and fixed force of the magnetic moment. The variation of the domain structure and correlated magneto-impedance of the element is characterized by a direction of magnetic easy axis. In this chapter, a magnetic phenomenon and an analytical explanation is shown for the rectangular magnetic element with the width of some tens of microns, therefore these element has the Landau-Lifshitz-like magnetic domain. The phenomenon is based on the variation of magnetic domain and correlated magneto-impedance induced by external magnetic field as a parameter of the in-plane direction of uniaxial magnetic easy axis.

Original languageEnglish
Title of host publicationMagnetic Thin Films
Subtitle of host publicationProperties, Performance and Applications
PublisherNova Science Publishers, Inc.
Pages175-232
Number of pages58
ISBN (Print)9781612093024
Publication statusPublished - 2011 Apr 1

ASJC Scopus subject areas

  • Materials Science(all)

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