Abstract
A systematic investigation of the influence of Al and V on the magnetoimpedance (MI) effect in melt-spun Fe73.5Si13⋅5B8CuNb(3−x)VxAl (x=0, 1, 1.5, and 3) ribbons has been performed in the frequency range 500 kHz–13 MHz and under dc magnetic field (Hdc) up to 60 Oe. MI was measured using impedance analyzer employing contact and noncontact methods. MIs of 61% (contact method) and 104% (noncontact method) were observed for the x=1.0 ribbon. Transverse and in-plane anisotropies were studied from the MI measurements and ferromagnetic resonance. Magnetic domain structure was studied in the ribbons through magnetic force microscopy. When the ribbon was rotated by 90° from the east-west direction, a 37% change in the MI was observed due to the earth’s magnetic field.
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