Cr2O3 thin film Heusler alloys MnN amorphous thin films antiferromagnetic resonance antiferromagnetic spintronics antiferromagnetism antiferromagnets blocking temperature compensated ferrimagnet exchange bias ferrimagnet garnet ferrite insulating antiferromagnet magnetism and magnetic materials magnetoelectric effect magnons metal organic decomposition micromagnetics n/a perpendicular exchange bias perpendicular magnetic anisotropy spin pumping spin-Hall effect spin-orbit torque spintronic applications spintronic devices spintronics sub-terahertz waves synthetic antiferromagnets