Exchange Coupling between Antiferromagnetic Mn–Ir and Ferromagnetic Ni–Fe Layers

Abstract

Exchange couplings between antiferromagnetic Mn–Ir and ferromagnetic Ni–Fe layers have been investigated while varying the Mn–Ir composition. These exchange couplings appeared at room temperature at Ir compositions between 20 and 46 at.%. The maximum exchange coupling field of 3.2 kA/m was obtained for Mn–20 at.%Ir(59 nm)/Ni–Fe(20 nm)/Zr(10 nm). Dependence of the exchange coupling fields on each layer thickness was also investigated. The Mn–Ir/Ni–Fe bilayers maintained high exchange coupling fields at Mn–Ir layer thicknesses above 10 nm.

Oscillatory tunnel magnetoresistance in double barrier magnetic tunnel junctions

“…Since the annealing temperature is close to the Blocking temperature of Ir-Mn, 15 the applied field sets the direction of the exchange bias. We found the exchange bias H E is about 170 Oe at 4.2 K and 100 Oe at room temperature for both top and bottom electrodes.…”

Effect of IrMn inserted layer on anomalous-Hall resistance and spin-Hall magnetoresistance in Pt/IrMn/YIG heterostructures

“…The IrMn alloy, which have been widely used to pin an adjacent FM layer in spin valve devices via exchange bias, 17 demonstrates large ISHE voltage when in contacts with YIG. 9 Recently, a large SHE and anomalousHall effect (AHE) have been theoretically proposed in Cr, FeMn, and IrMn AFMs owing to their large spinorbit coupling (SOC) or Berry phase of the non-collinear spin textures.…”

Magnetic properties and microstructures of Mn−Ir/Ni−Fe exchange biased multilayers on Ta and Cr buffer layers

“…One of them is the (111) diffraction peak of the Ni-Fe layer with an fcc structure of around 2θ=44 o , and the other is the (111) diffraction peak of the Mn-Ir layer with an fcc structure of around 2θ=41 o . This indicates that the (111) planes of the Mn-Ir layer can be epitaxially grown on the (111) planes of the NiFe layer deposited on a Ta buffer layer [7]. Here, the d spacing of the Ni-Fe layer and the Mn-Ir layer was calculated from the peak position of the diffraction pattern, and the d spacing values of the layers were about 0.205 nm and 0.2173 nm, respectively.…”