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Localisation phenomena in highly disordered metals close to the extremeconditions determined by the Mott-Ioffe-Regel (MIR) limit when the electronmean free path is approximately equal to the interatomic distance is achallenging problem. Here, to shed light on these localisation phenomena, westudied the dc transport and optical conductivity properties of nanoscaledmultilayered films composed of disordered metallic Ta and magnetic FeNinanoisland layers, where ferromagnetic FeNi nanoislands have giant magneticmoments of 10^3-10^5 Bohr magnetons (\mu_B). In these multilayered structures,FeNi nanoisland giant magnetic moments are interacting due to the indirectexchange forces acting via the Ta electron subsystem. We discovered that thelocalisation phenomena in the disordered Ta layer lead to a decrease in theDrude contribution of free charge carriers and the appearance of the low-energyelectronic excitations in the 1-2 eV spectral range characteristic ofelectronic correlations, which may accompany the formation of electronicinhomogeneities. From the consistent results of the dc transport and opticalstudies we found that with an increase in the FeNi layer thickness across thepercolation threshold evolution from the superferromagnetic to ferromagneticbehaviour within the FeNi layer leads to the delocalisation of Ta electronsfrom the associated localised electronic states. On the contrary, we discoveredthat when the FeNi layer is discontinuous and represented by randomlydistributed superparamagnetic FeNi nanoislands, the Ta layer normalized dcconductivity falls down below the MIR limit by about 60%. The discovered effectleading to the dc conductivity fall below the MIR limit can be associated withnon-ergodicity and purely quantum (many-body) localisation phenomena, whichneed to be challenged further.

Control of Mooij correlations at the nanoscale in the disordered metallic Ta - nanoisland FeNi multilayers