2021, Zubar, T., Grabchikov, S., Kotelnikova, A., Kaniukov, E., Kutuzau, M., Leistner, K., Nielsch, K., Vershinina, T., Tishkevich, D., Kanafyev, O., Kozlovskiy, A., Zdorovets, M., Fedosyuk, V., Trukhanov, A.

The effect of microstructure on the efficiency of shielding or shunting of the magnetic fluxby permalloy shields was investigated in the present work. For this purpose, the FeNi shieldingcoatings with different grain structures were obtained using stationary and pulsed electrodeposition.The coatings’ composition, crystal structure, surface microstructure, magnetic domain structure, andshielding efficiency were studied. It has been shown that coatings with 0.2–0.6μm grains have adisordered domain structure. Consequently, a higher value of the shielding efficiency was achieved,but the working range was too limited. The reason for this is probably the hindered movement of thedomain boundaries. Samples with nanosized grains have an ordered two-domain magnetic structurewith a permissible partial transition to a superparamagnetic state in regions with a grain size of lessthan 100 nm. The ordered magnetic structure, the small size of the domain, and the coexistenceof ferromagnetic and superparamagnetic regions, although they reduce the maximum value ofthe shielding efficiency, significantly expand the working range in the nanostructured permalloyshielding coatings. As a result, a dependence between the grain and domain structure and theefficiency of magnetostatic shielding was found.

2021, Nichterwitz, M., Honnali Sudheendra, S., Kutuzau, M., Guo, S., Zehner, J., Nielsch, K., Leistner, K.

The possibility of tuning magnetic material properties by ionic means is exciting both for basic science and, especially in view of the excellentenergy efficiency and room temperature operation, for potential applications. In this perspective, we shortly introduce the functionality ofmagneto-ionic materials and focus on important recent advances in this field. We present a comparative overview of state-of-the-art magneto-ionic materials considering the achieved magnetoelectric voltage coefficients for magnetization and coercivity and the demonstrated timescales for magneto-ionic switching. Furthermore, the application perspectives of magneto-ionic materials in data storage and computing,magnetic actuation, and sensing are evaluated. Finally, we propose potential research directions to push this field forward and tackle thechallenges related to future applications

2021, Herrera Diez, L., Kruk, R., Leistner, K., Sort, J.

[no abstract available]