RESISTANCE NOISE IN UNCOUPLED GIANT MAGNETORESISTIVE MULTILAYERS

Various uncoupled, magnetoresistive multilayer systems show quasiequil ibrium resistance noise associated with \dr(H)/dH\. The size of this 1 /f noise, particularly in comparison with Johnson noise in various fre quency ranges, is discussed for all the different systems. All the obs erved samples exhibit resistive Barkhausen noise, allowing the measure ment of domain sizes very similar to those observed in coupled samples . In addition, the asymmetric hysteresis of the Barkhausen noise in un coupled multilayers suggests the same type of hysteretic domain struct ure observed in antiferromagnetically coupled multilayers. (C) 1996 Am erican Institute of Physics.