Microstructure, magnetic properties and the giant magnetoimpedance effect of amorphous CoSiB thin films deposited by different preparation methods

Abstract

Giant magneto-impedance (GMI) effects have been observed in a number of soft magnetic materials [1][2][3][4]. Amorphous Co-Si-B alloy satisfy the requirements for a core materials in GMI sensor because of its superior soft magnetic properties, such as a very low coercivity, much higher permeability, lower saturation field, nearly zero magnetostriction [5][6]. For example, in CoSiB/Cu/CoSiB films of 7 µm thick, the GMI ratio is 340% for a frequency of 10 MHz and a DC magnetic field of 9 Oe [7]. Therefore, thin films of CoSiB alloy are particularly attractive for use in magnetic sensing devices.Usually, magnetron sputtering has been most widely used to produce thin GMI films [8], as it is able to produce multiple

Magnetic field detection utilizing soft magnetic ribbons and a rectangular solenoid

“…(c) the magnetization curve of the magnetic ribbon of 3 mm × 30 mm × 0.022 mm along the ribbon length direction measured with the magnetic performance measurement system; (d) µ L of magnetic ribbon of 3 mm × 30 mm × 0.022 mm along the ribbon length direction as a function of H. as exhibited in figures 2(e) and (f). The phenomenon that both ∆L/L and ∆Z/Z of proposed sensors decline with H monotonically is similar to that of the planar magnetic inductive sensors [1,21,28] and GMI sensors [5,32,33]. The reason is that the easy magnetization axis is along the ribbon length direction and µ L decreases monotonically with H due to the magnetic domain wall movement and domain rotation.…”

Influence of Gamma Irradiation to Magneto-Impedance Ratio in the Electrodeposited [NiFe/Cu]₄ Multilayer

“…For examples, the phenomenon can be applied to nondestructive testing [2,3] for case in the industrial, bio-analytical systems [4] and biosensors [5] for medical area, and many more. Controlling the film thickness and soft magnetic properties are two key factors for magnetoimpedance effect [6]. In addition, the magneto-impedance effect is also influence of the materials, the geometry of the sample, and the fabrication procedure of films or multilayers.…”