• Campos De Oliveira, Caique
• Autreto, Pedro
• Costin, Gelu
• Tiwary, Chandra Sekhar
• Sarkar, Suman

Abstract

<jats:title>Abstract</jats:title><jats:p>Silicon'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 SiO2 to paramagnetic behavior in transition metal-doped silicates like Rhodonite silicate (CaMn3Mn(Si5O15)) 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. Unraveling the complicated interplay of silicates' structural, magnetic, and electronic properties provides critical insights for future research and the development of novel materials and composites.</jats:p>

Topics

• impedance spectroscopy
• phase
• composite
• Silicon
• density functional theory
• two-dimensional
• coercivity