Effects of flux concentrators on the low frequency noise in magnetoresistive sensing devices

This paper investigated the effects of flux concentrators (FCs) on magnetic 1/f noise in magnetoresistive sensing devices. This is done by comparing results for the cases of bare (without FCs) sensors and those with FCs. It is shown that FCs can be a source of broad-band low frequency noise in AC MEMS flux concentrator device when the signal modulation amplitudes are sufficiently high.