Tuning thermo-magnetic properties of dilute-ferromagnet multilayers using RKKY interaction
Dmytro M. Polishchuk, Milton Persson, Mykola M. Kulyk, Erik Holmgren,, Gabriele Pasquale, Vladislav Korenivski
TL;DR
This paper reports a significant enhancement of RKKY interaction in dilute-ferromagnet multilayers through interface engineering, enabling precise control of magnetic properties for advanced spintronic and cooling applications.
Contribution
It introduces a method to amplify RKKY coupling and tune Curie temperature independently in multilayers by adding ultrathin Fe layers at interfaces.
Findings
20-fold increase in RKKY interaction strength
Sharpened Curie transition due to interface effects
Independent tuning of Curie temperature via magnetic dilution
Abstract
We demonstrate a 20-fold enhancement in the strength of the RKKY interlayer exchange in dilute-ferromagnet/normal-metal multilayers by incorporating ultrathin Fe layers at the interfaces. Additionally, the resulting increase in the interface magnetic polarization profoundly affects the finite-size effects, sharpening the Curie transition of the multilayer, while allowing to separately tune its Curie temperature via intralayer magnetic dilution. These results should be useful for designing functional materials for applications in magneto-caloric micro-refrigeration and thermally-assisted spin-electronics.
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