Magnetic properties and magnetoresistance of hybrid multilayer nanostructures {[(Co40Fe40B20)34(SiO2)66]/[ZnO]}n

• Published in: Journal of magnetism and magnetic materials Vol. 604; p. 172287
• Main Authors: Kalinin, Y.E., Sitnikov, A.V., Makagonov, V.A., Foshin, V.A., Volochaev, M.N., Pripechenkov, I.M., Perova, N.N., Ganshina, E.A., Rylkov, V.V., Granovsky, A.B.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15-08-2024
• Subjects: Hybrid multilayers; Magnetization; Nanostructures; Negative magnetoresistance; Negative magnetoresistance; Nanostructures; Magnetization; Hybrid multilayers
• ISSN: 0304-8853
• DOI: 10.1016/j.jmmm.2024.172287

•Hybrid multilayer nanostructures were obtained by ion-beam sputtering method.•Multilayer nanostructures are formed from layers of superparamagnetic metal–insulator composite and ZnO semiconductor interlayers.•The structural, electrical, magnetic, magneto-optical properties and magnetoresistance of hybrid multilayer structures have been studied.•The magnetoresistance of hybrid multilayer nanostructures depends significantly on the thickness of ZnO interlayers.•An increase in the magnetoresistance of hybrid multilayer nanostructures in comparison with the reference metal–insulator composite has been experimentally discovered.
The structural, electrical, magnetic, magneto-optical properties and magnetoresistance of {[(Co40Fe40B20)34(SiO2)66]/[ZnO]}n multilayer structures, where n = 50 is the number of bilayers (Co40Fe40B20)34(SiO2)66 nanocomposite and ZnO have been studied. The thicknesses of (Co40Fe40B20)34(SiO2)66 nanocomposite layers as well as ZnO spacers were varied in a wide range. The samples were synthesized by ion-beam sputtering onto glass ceramic substrates. The (Co40Fe40B20)34(SiO2)66 composite have an amorphous structure and the semiconductor ZnO interlayers have a hexagonal crystalline structure with the p63mc symmetry group. The nanocomposite layers containing a ferromagnetic component far from the percolation threshold are in a superparamagnetic state. The presented in the paper data of magnetization, magneto-optical transverse Kerr effect and magnetoresistance indicates that long-range ferromagnetic order does not form down to 77 K both for references ZnO films and studied multilayers with thin and thick ZnO interlayers. An increase in the magneto-optical signal in multilayers compared to references (Co40Fe40B20)34(SiO2)66 composite films has been detected at 1.2 eV. The magnetoresistance of {[(Co40Fe40B20)34(SiO2)66]/[ZnO]}n multilayers with thick (>32 nm) ZnO interlayers is lower than in reference (Co40Fe40B20)34(SiO2)66 nanocomposite, while at thin ZnO interlayers magnetoresistance is significantly higher and reaches 12 % at temperatures of 77 К. Possible mechanisms of ferromagnetic and antiferromagnetic ordering, enhancement of the magneto-optical response and magnetoresistance in {[(Co40Fe40B20)34(SiO2)66]/[ZnO]}n multilayer nanostructures are discussed.