Nonequilibrium spin injection in monolayer black phosphorus.

Area of Science:

• Condensed Matter Physics
• Materials Science
• Quantum Transport

Background:

• Monolayer black phosphorus (MBP) is an emerging 2D electronic material.
• MBP possesses a direct band gap and high carrier mobility.
• Spintronic devices require efficient spin injection and transport.

Purpose of the Study:

• To theoretically investigate nonequilibrium spin injection and transport in MBP.
• To analyze spin-polarized quantum transport in 2D magnetic tunneling structures.
• To compare device performance with Ni(111) and Ni(100) contacts.

Main Methods:

• Theoretical investigation of quantum transport phenomena.
• Simulation of spin injection efficiency and tunnel magnetoresistance.
• Analysis of spin-polarized and charge currents.
• Examination of transmission spectra under nonequilibrium conditions.

Main Results:

• Both Ni(111)/MBP/Ni(111) and Ni(100)/MBP/Ni(100) structures exhibit spin-polarized transport.
• The Ni(100)/MBP/Ni(100) trilayer demonstrates superior properties.
• High spin injection efficiency and tunnel magnetoresistance ratio are maintained against bias voltage in the Ni(100) structure.
• Nonequilibrium transport is understood through transmission spectrum analysis.

Conclusions:

• MBP is a viable material for spintronic applications.
• Ni(100) contacts significantly enhance spin injection and magnetoresistance in MBP-based devices.
• The Ni(100)/MBP/Ni(100) structure is promising for high-performance magnetic tunneling devices.