Phys.org  October 30, 2023
Transition-metal oxides (TMOs) with strong ferrimagnetism provide new platforms for tailoring the anomalous Hall effect (AHE) beyond conventional concepts based on ferromagnets, and particularly TMOs with perpendicular magnetic anisotropy (PMA) are of prime importance for today’s spintronics. In this study researchers in Germany reported on transport phenomena and magnetic characteristics of the ferrimagnetic TMO NiCo2O4 (NCO) exhibiting PMA. The entire electrical and magnetic properties of NCO films were strongly correlated with their conductivities governed by the cation valence states. The AHE exhibited an unusual sign reversal resulting from a competition between intrinsic and extrinsic mechanisms depending on the conductivity, which could be tuned by the synthesis conditions independent of the film thickness. Skew-scattering was identified as an AHE contribution for the first time in the low-conductivity regime. According to the researchers their work opens a new route for future spintronics, such as ferrimagnetic high-density memories… read more. Open Access TECHNICAL ARTICLEÂ
a) Crystal structure of inverse spinel NiCo2O4… Credit: Advanced Science, Volume 10, Issue 28, 2302956 , 2 August 2023