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• W2331993534 abstract "Insertion of a thin 3$mathit{text{d}}$ ferromagnetic metal/alloy layer between the barrier layer and the perpendicularly magnetized ferromagnetic electrode is an effective method to enhance the magnetoresistance (MR) ratio in perpendicular magnetic tunnel junctions (p-MTJs). In the present paper we systematically studied the structural and magnetic properties as well as the spin-dependent transport in p-MTJs with a core structure MnGa/FM/MgO/CoFeB (FM $=$ Fe, Co), with the MnGa being the $mathit{text{L}}{1}_{0}$ MnGa alloy ($M{n}_{57}G{a}_{43}$, $M{n}_{62}G{a}_{38}$) and the $mathit{text{D}}{0}_{22}$ MnGa alloy ($M{n}_{70}G{a}_{30}$). The insertion of the Fe and Co layers enhances the MR ratio significantly as well as the MnGa composition dependence of the MR ratio. In addition, opposite magnetic properties and $mathit{text{MR}}$($mathit{text{H}}$) curves of MTJs with Fe and Co interlayers are observed, naturally suggesting the ferromagnetic and antiferromagnetic exchange coupling for MnGa/Fe(bcc) and MnGa/Co(bcc), respectively. By considering the exchange coupling between the FM and MnGa, we successfully simulated the $mathit{MR}$($mathit{text{H}}$) curves of the samples with Fe and Co interlayers based on a simple model. Furthermore, the interlayer effect on the transport properties are discussed based on the temperature dependence of the MR ratio by using the magnon excitation model modified with impurity-induced hopping. It shows that the FM interlayer restrains the impurity induced hopping and the magnon excitation; and furthermore, the Co is more effective in restraining the impurity diffusion and magnon excitation as compared to Fe." @default.
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• W2331993534 date "2013-05-23" @default.
• W2331993534 modified "2023-09-25" @default.
• W2331993534 title "Interface tailoring effect on magnetic properties and their utilization in MnGa-based perpendicular magnetic tunnel junctions" @default.
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• W2331993534 doi "https://doi.org/10.1103/physrevb.87.184426" @default.
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