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Antiferromagnet-mediated interlayer exchange: hybridization versus proximity effect

D. M. PolishchukYu. O. Tykhonenko-PolishchukYa. M. Lytvynenko ...+5 V. Korenivski
Mar 2023
摘要
We investigate the interlayer coupling between two thin ferromagnetic (F)films mediated by an antiferromagnetic (AF) spacer in F*/AF/F trilayers andshow how it transitions between different regimes on changing the AF thickness.Employing layer-selective Kerr magnetometry and ferromagnetic-resonancetechniques in a complementary manner enables us to distinguish between threefunctionally distinct regimes of such ferromagnetic interlayer coupling. The Flayers are found to be individually and independently exchange-biased for thickFeMn spacers - the first regime of no interlayer F-F* coupling. F-F* couplingappears on decreasing the FeMn thickness below 9 nm. In this second regimefound in structures with 6.0-9.0 nm thick FeMn spacers, the interlayer couplingexists only in a finite temperature interval just below the effective N\'eeltemperature of the spacer, which is due to magnon-mediated exchange through thethermally softened antiferromagnetic spacer, vanishing at lower temperatures.The third regime, with FeMn thinner than 4 nm, is characterized by a muchstronger interlayer coupling in the entire temperature interval, which isattributed to a magnetic-proximity induced ferromagnetic exchange. Theseexperimental results, spanning the key geometrical parameters and thermalregimes of the F*/AF/F nanostructure, complemented by a comprehensivetheoretical analysis, should broaden the understanding of the interlayerexchange in magnetic multilayers and potentially be useful for applications inspin-thermionics.
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