Abstract
The giant magnetoimpedance effect in composite wires consisting of a non-magnetic inner core and soft magnetic shell is studied theoretically. It is assumed that the magnetic shell has a helical anisotropy. The current and field distributions in the composite wire are found by means of a simultaneous solution of Maxwell equations and the Landau-Lifshitz equation. The expressions for the diagonal and off-diagonal impedance are obtained for low and high frequencies. The dependences of the impedance on the anisotropy axis angle and the shell thickness are analyzed. Maximum field sensitivity is shown to correspond to the case of the circular anisotropy in the magnetic shell. It is demonstrated that the optimum shell thickness to obtain maximum impedance ratio is equal to the effective skin depth in the magnetic material.
| Original language | English |
|---|---|
| Pages (from-to) | 77-88 |
| Number of pages | 12 |
| Journal | Journal of Magnetism and Magnetic Materials |
| Volume | 296 |
| Issue number | 2 |
| DOIs | |
| State | Published - Jan 2006 |
Bibliographical note
Funding Information:This work was supported by the Korea Science and Engineering Foundation through ReCAMM. N.A. Buznikov would like to acknowledge the support of the Brain Pool Program.
Keywords
- Composite wires
- Helical anisotropy
- Magnetoimpedance