FMR investigations of exchange biased NiFe/IrMn/NiFe trilayers with high and low Ni relative content

• Published in: Journal of magnetism and magnetic materials 2019-01, Vol.470, p.151-155
• Main Authors: Dzhun, Irina O., Babaytsev, Georgy V., Chechenin, Nikolay G., Gritsenko, Christina A., Rodionova, Valeria V.
• Format: Article
• Language: English
• Subjects: Anisotropy; Antiferromagnetism; Bias; Double-exchange bias; Exchanging; Ferroelectrics; Ferromagnetic coupling; Ferromagnetism; Ferrous alloys; Intermetallic compounds; Iron compounds; Magnetic alloys; Magnetic fields; Magnetic properties; Magnetic thin films; Magnetization; Multilayered thin films; Nickel; Nickel compounds; Noncollinearity; Rotatable anisotropy; Thickness; Thin films; Trilayer system
• ISSN: 0304-8853; 1873-4766
• DOI: 10.1016/j.jmmm.2017.11.028

•Trilayer NixFe(1−x)(10нм)/IrMn(tAF)/NixFe(1−x(10нм)/thin film structure.•Low-nickel, high-nickel permalloy.•Exchange bias, noncollinearity and magnetization of bottom and top ferromagnetic layers.•Ferromagnetic coupling through the antiferromagnetic spacer.•Rotatable anisotropy. Magnetic properties of trilayer double-exchange biased Si/Ta(30 nm)/NixFe(1−x)(10 nm)/IrMn(tAF)/NixFe(1−x(10 нм)/Ta(30 нм) thin film structures with x = 0.4 and x = 0.75 were investigated. The exchange bias, noncollinearity of unidirectional and uniaxial anisotropy and magnetization in both bottom and top ferromagnetic layers as a function of the antiferromagnetic (AF) layer thickness in the range from 2 to 50 nm were investigated. The obtained effects support the model of ferromagnetic coupling through the antiferromagnetic spacer and the model of rotatable anisotropy contribution at small AF thickness. It was found that usage of low-nickel permalloy in exchange biased systems has advantages of higher magnetization, a higher magnetic ordering at the interface and smaller critical thickness of antiferromagnetic layer to set the exchange bias, though provides a lower exchange bias compared with normal permalloy composition.