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Title: | Non-uniform superlattice magnetic tunnel junctions |
Authors: | Chakraborti, S. Sharma, A. |
Keywords: | broad-band spin filtering magnetic tunnel junction resonant tunneling spin transfer torque tunnel magnetoresistance |
Issue Date: | 14-Oct-2024 |
Abstract: | We propose a new class of non-uniform superlattice magnetic tunnel junctions (Nu-SLTJs) with the linear, Gaussian, Lorentzian, and Pöschl-Teller width and height based profiles manifesting a sizable enhancement in the TMR (≈104 − 106%) with a significant suppression in the switching bias (≈9 folds) owing to the physics of broad-band spin filtering. By exploring the negative differential resistance region in the current-voltage characteristics of the various Nu-SLTJs, we predict the Nu-SLTJs offer fastest spin transfer torque switching in the order of a few hundred picoseconds. We self-consistently employ the atomistic non-equilibrium Green’s function formalism coupled with the Landau-Lifshitz-Gilbert-Slonczewski equation to evaluate the device performance of the various Nu-SLTJs. We also present the design of minimal three-barrier Nu-SLTJs having significant TMR (≈104%) and large spin current for the ease of device fabrication. We hope that the class of Nu-SLTJs proposed in this work may lay the bedrock to embark on the exhilarating voyage of exploring various non-uniform superlattices for the next generation of spintronic devices. |
URI: | http://dspace.iitrpr.ac.in:8080/xmlui/handle/123456789/4740 |
Appears in Collections: | Year-2023 |
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File | Description | Size | Format | |
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Non-uniform full text.pdf | 3.74 MB | Adobe PDF | View/Open Request a copy |
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