Paramagnetic two-dimensional silicon-oxide from natural silicates

自旋电子学 顺磁性 抗磁性 材料科学 硅酸盐 凝聚态物理 磁矩 磁性半导体 价(化学) 铁磁性 化学物理 兴奋剂 化学工程 化学 磁场 物理 光电子学 工程类 有机化学 量子力学
作者
Preeti Lata Mahapatra,Caique Campos de Oliveira,Gelu Costin,Suman Sarkar,Pedro Alves da Silva Autreto,Chandra Sekhar Tiwary
出处
期刊:2D materials [IOP Publishing]
卷期号:11 (1): 015019-015019 被引量:1
标识
DOI:10.1088/2053-1583/ad10b9
摘要

Abstract Silicon dioxide’s potential for having magnetic properties is fascinating, as combining its electronic capabilities with magnetic response seems promising for spintronics. In this work, the mechanisms that drive the change from diamagnetic behavior in pure silicates like SiO 2 to paramagnetic behavior in transition metal-doped silicates like Rhodonite silicate (CaMn 3 Mn(Si 5 O 15 )) are explored. This naturally occurring Rhodonite (R)-silicate was thinned down while retaining its magnetic properties by liquid-phase scalable exfoliation. Exfoliating R-silicate into the two-dimensional (2D) structure by LPE increases magnetic coercivity, and the internal resistance to demagnetization (ΔHc) up to ∼23.95 Oe compared to 7.08 Oe for its bulk phase. DFT spin-polarized calculations corroborate those findings and explain that the origin of the magnetic moment comes mainly from the Mn in the doped 2D silicate due to the asymmetrical components of the Mn d and Si p states in the valence band. This result is further illustrated by the spin component differential charge densities showing that Mn and Si atoms display a residual up spin charge. Rhodonite’s unusual magnetic behavior has considerable potential for spintronics, data storage, and sensing technologies. Understanding the complex relationships between the structural, magnetic, and electronic properties of silicates is essential for developing new materials and composites as well as for driving future research.

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