Tailoring of magnetic anisotropy in Fe-rich glass-coated magnetic microwires by thermo-mechanical annealing

• Published in: Sensors and actuators. A, Physical Physical, 2003-09, Vol.106 (1-3), p.96-100
• Main Authors: Larin, V.S, Zhukova, V, Zhukov, A, Torcunov, A.V, Vazquez, M
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Fe and its alloys; General equipment and techniques; Giant magneto-impedance effect; Induced magnetic anisotropy; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Magnetic bistability; Magnetic properties and materials; Physics; Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing; Studies of specific magnetic materials
• ISSN: 0924-4247; 1873-3069
• DOI: 10.1016/S0924-4247(03)00142-0

The effect of thermal treatments such as conventional furnace annealing (CA) and annealing under tensile stress (SA) on the hysteretic magnetic properties of Fe74B13Si11C2 glass-coated microwires has been studied. CA treatment does not change the character of the hysteresis loop but coercivity, Hc, slightly decreases due to the internal stress relaxation. Under certain SA conditions (annealing temperature, Tann>300°C, applied stress, σ>700MPa) the hysteresis loop becomes inclined with transverse anisotropy field about 1500A/m. This modification of the hysteresis loop has been interpreted in terms of the change of the easy magnetization direction from axial to a transverse direction. On the other hand, samples subjected to stress annealing show noticeable (12%) magneto-impedance effect in spite of their large magnetostriction. Finally, application of tensile stresses to the stress-annealed sample results in the recovering of the rectangular hysteresis loop typical for the as-prepared state. This processing allows the tailoring of magnetic anisotropy in these microwires which is of interest for technological purposes.