Abstract
The CuBe/Fe20Co6Ni74 electroplated wires were prepared by a standard electrodeposition technique. Heat treatment in a dc magnetic field of 20 Oe applied along the axis of the wire at a temperature of 320 °C for 1 h resulted in a magnetic anisotropy with a longitudinal magnetic anisotropy component. The impedance of the field annealed CuBe/Fe20Co6Ni74 wire strongly depends on the external magnetic field. Very high magnetoimpedence (MI) (up to 600%) and MI sensitivity (up to 570%/Oe) were observed at a relatively low frequency of 1 MHz and a current intensity of 20 mA. Two MI maxima were observed for each branch of the MI responses. These maxima are different from each other: the value of the MI ratio, the MI sensitivity, and the value of the field in which each particular MI maximum appears. The angular dependence of a linear MI effect was studied for specific conditions: f=1 MHz and Irms=20 mA. Detailed analysis of the MI responses indicated the existence of two different types of spin-orientational phase transitions, strongly connected with high order magnetic anisotropy.
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