Post-treatment effects on the magnetic anisotropy of iron based metallic amorphous ribbons

• Published in: Journal of magnetism and magnetic materials 2018-09, Vol.461, p.106-110
• Main Authors: Chen, Y.S., Golygin, E.A., Gavrilyuk, A.A., Lin, J.G.
• Format: Article
• Language: English
• Subjects: Anisotropy; Annealing; Ferromagnetic resonance; Ferromagnetism; Heat treating; Heat treatment; Iron; Magnetic anisotropy; Magnetism; Precipitates; Residual stress; Ribbons; Tapes (metallic)
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2018.04.057

•Observation of acid treatment effect on the surface of amorphous ribbons.•Using FMR to detect the surface-bulk magnetic structure related to the acid and the heat treatments.•Evidence of tunable annealing-induced magnetic anisotropy with acid treatment.•Finding a relaxation of internal stress after annealing at 410 °C. The effects of acid and heat treatment on the magnetic anisotropy of amorphous Fe67Co10Cr3Si5B15 ribbons are studied, using the angular-dependent magnetization and ferromagnetic resonance (FMR). The change of FMR spectrum after acid treatment indicates that the surface precipitates in raw sample contain some magnetic elements. A post annealing under the field of 2000 Oe is applied to modify the magnetic anisotropy of ribbons, with the annealing temperature varying from 370 to 410 °C. At 370 °C, a magnetoelastic anisotropy field of +40 Oe is found in the sample with 60 min acid-treatment, while it is −74 Oe for the sample with 30 min acid-treatment. However, it approaches to zero at 410 °C for all samples, indicating the internal stress is fully released. This study demonstrates that FMR is an effective technique on investigating the details of magnetic anisotropy configuration against various post-treatment conditions for amorphous ribbons.