Thin film based magnetoimpedance sensor for magnetic needle position identification

Fe22Ni78/Cu-based multilayered sensitive elements were designed and fabricated by sputtering technique. The thickness of the magnetic layers and their number in the structure was the subject to change and was investigated by magneto-optical and magnetoimpedance methods. The sensitivity of the total impedance magnetoimpedance ratio for determining the sewing needle was 20% by varying its position above the element.Fe22Ni78/Cu-based multilayered sensitive elements were designed and fabricated by sputtering technique. The thickness of the magnetic layers and their number in the structure was the subject to change and was investigated by magneto-optical and magnetoimpedance methods. The sensitivity of the total impedance magnetoimpedance ratio for determining the sewing needle was 20% by varying its position above the element.