## 4 Conclusions  
When designing measuring systems containing magnetometric elements or devices whose principle of operation consists in the interaction of magnetic fields, such as active stabilization systems of small satellites, it is necessary to take into account the magnetic properties of the incorporated components, which directly or indirectly affect the operation of these systems. Regarding ferromagnetic components, their magnetic properties are often stated through magnetic quantities derived from the reconstructed magnetization characteristics, usually represented in the form of a hysteresis curve. Although the stated magnetic quantities can vary by different factors such as heat treatment, lattice defects, grain boundaries, etc., the significant one can be the shape of the produced part in the many applications. In this case, the effect of demagnetizing fields is manifested, the character of which varies with the change of material shape, consequently affecting its magnetic properties. This effect is of significant importance and needs to be taken into account regarding amorphous alloy ribbons since manufacturers state their magnetic properties for the toroidal-shaped cores, which differ in technical practice, where it is often required to design the produced part made of amorphous ribbons in shape with so-called open ends, due to which the demagnetization field arises. Ultimately, neglecting this phenomenon may have an impact on the functionality of the entire system. Therefore, in such a case, it is necessary to experimentally determine the magnetic properties of the final produced part. Nowadays, there are several methods for measuring the magnetic hysteresis curve of ferromagnetic materials. However, these are primarily intended for measuring toroidal-shaped cores. Therefore, the measuring workstation using the method based on measuring the stray magnetic field of the open-ended samples was introduced in this manuscript. Besides the description of its measuring chain and the included devices, the complex procedure of deriving the mathematical apparatus capturing the physical essence of the method was implemented. For the comparison, the core of the electromagnetic actuator in the role of the produced component made of the amorphous ribbon core was measured as an example. The measurement process was performed in two ways. From the view of chronological order, the first measurement was carried out to obtain the magnetic characteristic of the investigated core assembled with the actuator winding coils as the single produced part, forming the  
Figure 8: Magnetic characteristics of VITROVAC 6025, VITROVAC 6030, and VITROVAC 6150 amorphous ribbons. fully functional electromagnetic actuator. In this case, the actuator winding was used to magnetize the ferromagnetic core, the stray magnetic field of which was subsequently measured without the use of the introduced mathematical apparatus since the compensation and the excitation coils, which would be capable of homogeneously magnetizing the core in its entire volume, were not included into this measurement. Subsequently, the second measurement was performed using the designed measuring workstation based on the stray magnetic field measuring method intended for the open-ended samples. As can be seen from the achieved results, the first measurement method, widely used in manufacturing, gives the characteristics in the form of the dependency of the measured stray magnetic field on the excitation current. Consequently, the output of this method does not provide information about the magnetic state of the material for a given magnetization cycle. Moreover, it can be used only after the product's final production since the actuator winding is the active part of the measuring chain. On the contrary, the result of the second measurement performed by the introduced workstation is magnetization characteristic as the variation of the core magnetic polarization dependent on the excitation magnetic field.