Preparation and magnetic properties of (Co^sub 0.6^Fe^sub 0.3^Ni^sub 0.1^)^sub 70-x^(B^sub 0.811^Si^sub 0.189^)^sub 25+x^Nb^sub 5^ bulk glassy alloys

• Published in: Journal of materials science. Materials in electronics Vol. 26; no. 9; p. 7006
• Main Authors: Dong, Yaqiang, Man, Qikui, Chang, Chuntao, Shen, Baolong, Wang, Xin-min, Li, Run-wei
• Format: Journal Article
• Language: English
• Published: New York Springer Nature B.V 01.09.2015
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-015-3320-9

The preparation and soft magnetic properties of (Co^sub 0.6^Fe^sub 0.3^Ni^sub 0.1^)^sub 70-x^(B^sub 0.811^Si^sub 0.189^)^sub 25+x^Nb^sub 5^ (x = 0-4) glassy alloys were investigated. This multicomponent system was found to exhibit a distinct glass transition and a wide supercooled liquid region of over 50 K before crystallization. As a result, the (Co^sub 0.6^Fe^sub 0.3^Ni^sub 0.1^)^sub 70-x^(B^sub 0.811^Si^sub 0.189^)^sub 25+x^Nb^sub 5^ bulk glassy alloys with diameters up to 5 mm were produced by copper mold casting. In addition to high glass-forming ability, the Co-based glassy alloys also exhibit excellent soft-magnetic properties, i.e., saturation magnetization of 0.54-0.72 T, low coercive field of 0.7-1.4 A/m, and high effective permeability of 18,600-22,400 at 1 kHz under a field of 1 A/m. Furthermore, the giant magneto impedance effects of the (Co^sub 0.6^Fe^sub 0.3^Ni^sub 0.1^)^sub 68^(B^sub 0.811^Si^sub 0.189^)^sub 27^Nb^sub 5^ glassy ribbon at different driving frequencies were also investigated. The results show that the largest impedance ratio is as high as 138 % at the frequency of 2.5 MHz under an ac current of 0.2 mA, together with high field sensitivity of 12.5 %/Oe.