Magnetoimpedance exchange coupling in different magnetic strength thin layers electrodeposited on Co-based magnetic ribbons

Exchange bias training effect in IrMn-layer/ferromagnetic-ribbon heterostructures probed with magnetoimpedance

“…This fact potentially implies presence of an antiferromagnetic coupling at the interface [44] . Also, we have shown in our previous work [29] that the hysteretic behavior of the MI response depends on the exchange coupling strength at the interface. Similarly, in the sample used in this work, exchange coupling at the interface between IrMn and ribbon can result the same effect and so the hysteretic behavior in MI response can be observed.…”

“…In this work, we use magnetoimpedance (MI) effect as a probe of the EB and the TE in in FM/AFM heterostructures that is made of an amorphous FM Co68.15Fe4.35Si12.5B15 ribbon and a thin layer of polycrystalline Ir20Mn80 (IrMn). The MI effect is a classical electrodynamic phenomenon in conducting FM with high transverse magnetic permeability (𝜇 𝑡 ) as the electrical impedance changes against external dc magnetic field [28][29][30][31][32][33][34][35][36][37] . The MI is correlated with the skin depth (δ = (ρ/πμtf) 1/2 ), of the high frequency f current and 𝜇 𝑡 of the conducting FM with electric resistivity ρ.…”

“…From far viewpoints, as the FM ribbon is a thick structure with thickness of 20 µm, it is rather unexpected to observe the EB effect and hence the TE. However, the MI was shown in many literatures [29,30,32,34] to be a surface sensitive measurement technique with confined of the most ac current at 100 nm at the skin depth. Due to their high magnetic permeability, MI effect in such ribbons is very sensitive against tiny changes at the surface.…”

Magnetoimpedance of CoFeCrSiB Ribbon-Based Sensitive Element with FeNi Covering: Experiment and Modeling

“…However, the maximum MI ratio was below 24%. This topic become very popular in recent years, and areas of interest include ideas for enhancing the GMI effect with both 3D metal and dielectric coatings [59][60][61][62]. However, this work is the first attempt to propose a methodology of the development of such a composite using modelization advantages which can be useful for the analysis of the experimental data of different authors.…”

Modulation of the magnetoimpedance effect of ZnO:Ag/NiFe heterostructures by thermal annealing

“…The MI effect has been explored in a wide variety of samples [9][10][11] , giving rise to a broad range of remarkable results. Among the different geometries, planar heterostructures consisting of a bilayer with a magnetic material and a non-magnetic metal/semiconductor have been drawing considerable attention due to the perspective of application in spintronics 12,13 .…”