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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.

Main urgent problems of the magnetic devices and primary converters development based on the mag-Creation of magnetic field sensor based on the anisotropic magnetoresistive transducer involves increasing the sensitivity and increase the thermal stability. The sensitivity to the magnetic field, which is determined by the ratio of the signal amplitude imbalance in magnetoresistive bridge caused the by influence of the magnetic field to the value of that field in the linear region of the transfer characteristics of the sensor [1-2] is the most important parameter, because it determines the use of sensors to address various problems. The range of use of magnetoresistive sensors in the technique is extremely wide therefore requirements to sensitivity value are extremely broad. The sensitivity value is influenced by a number of factors, among which first and foremost design and technology. Sensors based on magnetoresistive structures usually consist of a thin strip of magnetic material with thickness 0.03 µm, mainly iron-nickel alloy on which strips of high conductivity material (aluminum) are applied at an angle of 45 o [3]. These sensors are characterized by odd transfer characteristic with a sufficiently large linear range [4]. Studies conducted on various structures have shown that the greatest effect on the sensitivity has width (W) of the magnetic stripe and the distance between shunt strips (a) (Fig. 1, Tab.