Effect of Field Annealing Induced Magnetic Anisotropy on the Performance of Meander-Core Orthogonal Fluxgate Sensor

摘要

The magnetic anisotropy field distribution is discussed for Co-basedamorphous ribbon annealed under different field conditions leading todifferent induced anisotropies: longitudinal field (LF) and transversal field(TF) annealing. In order to understand the relation between the fieldannealing-induced anisotropy and the performance of meander-core orthogonalfluxgate sensor, field-annealed ribbons with different in-plane anisotropiesas cores of orthogonal fluxgate sensors are employed and both noise andsensitivity in fundamental mode are measured. Experimental results indicatethat LF annealing-induced anisotropy with easy axis perpendicular to thedirection of excitation field can effectively improve the sensor sensitivity. Onthe other hand, TF annealing-induced anisotropy with easy axis parallel toexcitation field results in lower sensitivity, but the noise is also lower. Theresults obtained are useful for developing the high-performance orthogonalfluxgate sensors based on amorphous ribbon cores.