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

https://doi.org/10.1016/j.jmmm.2024.172287

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.