期刊
SENSORS
卷 23, 期 17, 页码 -出版社
MDPI
DOI: 10.3390/s23177481
关键词
magnetic microwires; annealing; hysteresis loop; giant magnetoimpedance; domain wall propagation; magnetic anisotropy
This study investigates the effects of conventional annealing and Joule heating on the magnetic domain wall dynamics and giant magnetoimpedance (GMI) effect in Fe-rich microwires with different geometries. The results show that magnetic softness, GMI effect, and domain wall dynamics can be substantially improved by appropriate annealing.
As-prepared Fe-rich microwires with perfectly rectangular hysteresis loops present magnetization reversal through fast domain wall propagation, while the giant magnetoimpedance (GMI) effect in Fe-rich microwires is rather low. However, the lower cost of Fe-rich microwires makes them attractive for magnetic sensors applications. We studied the effect of conventional (furnace) annealing and Joule heating on magnetic-propertied domain wall (DW) dynamics and the GMI effect in two Fe microwires with different geometries. We observed that magnetic softness, GMI effect and domain wall (DW) dynamics can be substantially improved by appropriate annealing. Observed experimental results are discussed considering the counterbalance between the internal stresses relaxation and induced magnetic anisotropy associated with the presence of an Oersted magnetic field during Joule heating.
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