“…The measurement of the coercive force by the magnitude of the demagnetizing current was carried out using a KIFM-1 coercimeter with a pole section of 20x40 mm, in which a frame ferroprobe is used as a zero-indicator of the magnetic flux [4,5]. The measurement of the coercive force by the magnitude of the internal field was carried out using the hardware-software system MATEC Web of Conferences 346, 02040 (2021) ICMTMTE 2021 https://doi.org/10.1051/matecconf /202134602040 DIUS-1.15M [13,16] and magnetic multitester with a non-electric magnetizing device [13,19]…”