Enhancement of thermal stability of Zeeman-type spin-polarizer using 1DEG channel and gate-controlled resonant tunneling

Abstract We theoretically investigated a Zeeman-type spin-polarizer, which utilizes the Zeeman effect to generate spin-polarized current. The device consists of an InAs one-dimensional electron gas channel, a ferromagnetic (FM) nanomagnet, and a nanoscale gate electrode. Applying gate voltages independently to the FM nanomagnet and the gate electrode creates spin-dependent tunneling barriers. Our calculations demonstrate that reducing the dimensionality of the channel and introducing a spin-dependent quantum well and a single tunneling barrier significantly enhances the thermal stability of the spin-polarizer. Furthermore, we find spin-polarization exceeding <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mn>30</mml:mn> <mml:mo>%</mml:mo> </mml:math> in magnitude at <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mn>5.0</mml:mn> <mml:mspace width="0.5em"/> <mml:mi mathvariant="normal">K</mml:mi> </mml:math> , which represents a substantial improvement over previous reports. These findings provide a promising pathway toward the realization of high-performance, thermally stable Zeeman-type spin-polarizer for future spintronic applications.