2025/04/14 by Chakraborti, Sabarna, Kashyap, Arti, Sharma, Abhishek
#FOS: Physical sciences #Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
paper · doi:10.48550/arxiv.2504.09842
We propose the perspective of symmetry-selective resonance of the Δ1 states in the Fe/MgO/ZnO/MgO/Fe heterostructures, offering a broad landscape to design magnetic tunnel junctions (MTJs) that yield a towering tunnel magnetoresistance (TMR) up to 3.5×104% with the resistance area (RA) product dipping down to a minimum of 0.05~Ω⋅μm2, while maintaining a nearly perfect (99%) spin polarization. Our predictions are based on the self-consistent coupling of the non-equilibrium Green's function with density functional theory. We also present the charge current, spin current, and TMR with applied voltage of the Fe/MgO(3-layer)/ZnO(3-layer)/MgO(3-layer)/Fe MTJ, which offers a superior performance triad of TMR (1.3×104%), RA (0.45~Ω⋅μm2), and spin polarization (99%) over a regular Fe/MgO(6-layer)/Fe based MTJ (TMR ≈ 3.4×103%, RA ≈ 22~Ω⋅μm2). We provide a comprehensive insight integrating the transmission eigenchannel, spectral density, and the band structure of the Fe contacts to establish the role of symmetry-selective resonance in the Fe/MgO/ZnO/MgO/Fe MTJ.