“…The list of search keywords for patents statistics of magnetic field sensors is shown in Table I. Typical magnetic sensors [13,148,149,168] were taken into account, including MR sensors [7,11,157,169], Hall effect sensors [26,155,[170][171][172], fluxgates [173][174][175][176][177], superconducting quantum interference devices (SQUID) [156,[178][179][180][181], magneto-optical sensors [161,[182][183][184][185][186], search coils [187][188][189][190][191], magneto- Table I. inductive sensors [160,[192][193][194][195], magneto-impedance sensors [160,[196][197][198][199], magneto-diodes [153,[200]…”