Magnetization and ferromagnetic resonance measurements provide evidence of ferromagnetic coupling between ferromagnetic (F) layers separated by an intervening layer of antiferromagnetic (AF) NiO of thickness, tAF, where 7 nm<tAF<13 nm. Near 300 K, due to this coupling, the coercivity Hc and M–H loop squareness in F/AF multilayers increases as one increases the number of layers. The increased Hc and squareness have potential application in thin film magnets.
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Edelstein et al. (1999) studied this question.
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