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Current distribution and giant magnetoimpedance in composite wires with helical magnetic anisotropy |
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| Authors: | NA Buznikov AS Antonov AB Granovsky CG Kim CO Kim XP Li SS Yoon |
| Institution: | 1. Institute for Theoretical and Applied Electrodynamics, Russian Academy of Sciences, Moscow 125412, Russia;2. Research Center for Advanced Magnetic Materials, Chungnam National University, Daeduk Science Town, Daejeon 305-764, Republic of Korea;3. Faculty of Physics, M.V. Lomonosov Moscow State University, Moscow 119992, Russia;4. Department of Mechanical Engineering and Division of Bioengineering, National University of Singapore, Singapore 119260, Singapore;5. Department of Physics, Andong National University, Andong 760-749, Republic of Korea |
| 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. |
| Keywords: | 72 15 Gd 75 50Kj |
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