Technological Features Influence on Magnetic Sensitivity of Ferromagnetic Structures

The main urgent problems of the magnetic devices and primary conventers development based on the magnetoresistive structures are the sensitivity improvement and thermal stability. This paper discusses how to use the magnetoresistive structures based on nanoscale films of permalloy Ni (80%) Fe (20%) in the sensory systems. It is shown the variation of the shape and size ratio of magnetoresistive elements influences the characteristics of the magnetization and the dynamic range of the sensors, as well as maximum magnetic field sensitivity. The optimization of magnetoresistive structures topological sizes was carried out and sensor design with the highest sensitivity was chosen. It is shown that sensitivity of sensors can achieve value of 20.7 (mV/V)/(kA/m) by changing bias field. The ability to function in a large temperature range with coefficient of thermal stability - 0.35 %/°С was demonstrated for the obtained magnetoresistive structures.