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Antiferromagnets (AFMs) with zero net magnetization are proposed as activeelements in future spintronic devices. Depending on the critical thickness ofthe AFM thin films and the measurement temperature, bimetallic Mn-based alloysand transition metal oxide-based AFMs can host various coexisting ordered,disordered, and frustrated AFM phases. Such coexisting phases in the exchangecoupled ferromagnetic (FM)/AFM-based heterostructures can result in unusualmagnetic and magnetotransport phenomena. Here, we integrate chemicallydisordered AFM IrMn3 thin films with coexisting AFM phases into complexexchange coupled MgO(001)/Ni3Fe/IrMn3/Ni3Fe/CoO heterostructures and study thestructural, magnetic, and magnetotransport properties in various magnetic fieldcooling states. In particular, we unveil the impact of rotating the relativeorientation of the disordered and reversible AFM moments with respect to theirreversible AFM moments on the magnetic and magnetoresistance properties ofthe exchange coupled heterostructures. We further found that the persistence ofAFM grains with thermally disordered and reversible AFM order is crucial forachieving highly tunable magnetic properties and multi-level magnetoresistancestates. We anticipate that the introduced approach and the heterostructurearchitecture can be utilized in future spintronic devices to manipulate thethermally disordered and reversible AFM order at the nanoscale.

Highly Tunable Magnetic and Magnetotransport Properties of Exchange Coupled Ferromagnet/Antiferromagnet-based Heterostructures