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More than 30 years ago, Malozemoff (Phys. Rev. B 35, 3679 (1987))hypothesized that exchange interaction at the interface between a ferromagnet(F) and an antiferromagnet (AF) can act as an effective random field, which canprofoundly affect the magnetic properties of the system. However, until nowthis hypothesis has not been directly experimentally tested. We utilizemagnetoelectronic measurements to analyze the effective exchange fields atPermalloy/CoO interface. Our results cannot be explained in terms ofquasi-uniform effective exchange fields, but are in agreement with therandom-field hypothesis of Malozemoff. The presented approach opens a new routefor the quantitative analysis of effective exchange fields and anisotropies inmagnetic heterostructures for memory, sensing and computing applications.

Experimental demonstration and analysis of random field effects in ferromagnet/antiferromagnet bilayers