First-principles design of ferromagnetic monolayer MnO₂ at the complex interface

Abstract

Rapidly increasing interest in low-dimensional materials is driven by the emerging requirement to develop nanoscale 
 solid-state devices with novel functional properties that are not available in three-dimensional bulk phases. 
 Among the well-known low-dimensional systems, complex transition metal oxide interface holds promise for broad
 applications in electronic and spintronics devices. Herein, intriguing metal-insulator and 
 ferromagnetic-antiferromagnetic transitions are achieved in monolayer MnO$_2$ that is sandwiched into 
 SrTiO$_3$-based heterointerface systems through interface engineering. 
 By using first-principles calculations, we modeled three types of SrTiO$_3$-based heterointerface systems with different interface terminations and performed a comparative study on the spin-dependent magnetic and electronic properties that are established in the confined MnO$_2$ monolayer. First-principles study predicts that metal-insulator transition and magnetic transition in the monolayer MnO$_2$ are independent on the thickness of capping layers. Moreover, 100$\%$ spin-polarized two-dimensional electron gases accompanied by robust room temperature magnetism are uncovered in the monolayer MnO$_2$. Not only is the buried MnO$_2$ monolayer a new interface phase of fundamental physical interest, but it is also a promising candidate material for nanoscale spintronics applications. Our study suggests interface engineering at complex oxide interfaces is an alternative approach to designing high-performance two-dimensional materials.

Electrodeposition of MnAs-Based Thin-Film as a Possible Promising Candidate in Spintronics Applications

“…57 These chemical species contained in the electrochemically deposited thin film are very interesting as they both have properties suitable for applications in spintronics. 31,58 MnAs is a half-metal 59 typically obtained through physical deposition, it presents ferromagnetic properties, and spin anisotropy, which are key features for spintronic applications. 8,60 Previous papers in the literature report how an MnAs deposit was obtained by physical deposition and had interesting properties of ferromagnetism and spin anisotropy.…”

“…X-ray Photoelectron Spectroscopy (XPS) and XRD investigations confirmed the presence of MnAs and MnO 2 , which are of great interest in the field of spintronics. 31,32 The magnetic properties of the obtained sample were characterized by magnetometry using a SQUID apparatus.…”