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Condensed Matter > Materials Science
Title: Quantum-well resonances caused by partial confinement in MgO-based magnetic tunnel junctions
(Submitted on 20 Nov 2023 (v1), last revised 8 Apr 2024 (this version, v2))
Abstract: Quantum-well resonance is achieved through partial confinement in magnetic tunnel junctions (MTJs), which provides an additional operable degree of freedom to regulate quantum-well levels. Using Al/Fe/MgO/Fe/Al and Ag/Al/Fe/MgO/Fe/Al/Ag MTJs as examples, via first-principles calculations, we demonstrate that the partial confinement of $\Delta_1$ electron at Al/Fe interface and the full confinement at Fe/MgO interface combine to produce quantum-well resonances in Fe. The quantum-well levels of Fe can be periodically adjusted by two degrees of freedom: Fe and Al thickness. The oscillation period obtained from conductance $G_{\uparrow\uparrow}$ is 2.13 ML Fe (9 ML Al), close to 2.25 ML Fe (8.33 ML Al) calculated by bcc-Fe (fcc-Al) band. The combination of long and short periods enables quantum-well levels to be finely adjusted. An ultrahigh optimistic TMR effect of $3.05\times10$$^5$\% is achieved. Our results provides a new path for designing and applying quantum-well resonances in spintronics devices.
Submission history
From: Leina Jiang [view email][v1] Mon, 20 Nov 2023 03:10:30 GMT (496kb)
[v2] Mon, 8 Apr 2024 01:59:50 GMT (435kb)
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