Details

Autor(en) / Beteiligte

• Seddaoui, D.
• Menard, D.
• Yelon, A.

Titel

Measurement and Model of the Tensile Stress Dependence of the Second Harmonic of Nonlinear GMI in Amorphous Wires

Ist Teil von

• IEEE transactions on magnetics, 2007-06, Vol.43 (6), p.2986-2988

Ort / Verlag

New York, NY: IEEE

Erscheinungsjahr

2007

Quelle

IEEE Electronic Library (IEL)

Beschreibungen/Notizen

• The second harmonic component of nonlinear GMI in soft magnetic wires with helical anisotropy and near-zero negative magnetostriction subjected to different tensile stresses is studied for various current amplitudes (3-13 mA rms ) and frequencies (1-3 MHz). In the absence of tensile stress, the dc field dependence of the second harmonic of the voltage across the wire, V 2f , exhibits a symmetric four-peak structure. The application of increasing tensile stress at relatively low current (3-5 mA rms ) causes the V 2f signal to convert to a three-peak structure after a complicated series of changes. The three-peak structure consists of two outer peaks (OP) and one small central peak (CP) situated at very low field. When the current amplitude is increased, the V 2f signal reverts to the four-peak structure, reversing the same steps. At relatively high frequencies, the V 2f signal increases with current amplitude to more than 160 mV at high stress. Using a simple quasi-static model, we were able to qualitatively reproduce the three and four-peak structures and their dependence on current amplitude and tensile stress. Frequency dependence requires a dynamical model, as does precise determination of sizes and positions of peaks. This is being developed