Ferromagnetic behavior of ultrathin manganese nanosheets

TL;DR

This paper reports the first experimental observation of ferromagnetic behavior in ultrathin manganese nanosheets confined within Na-4 mica channels, revealing persistent ferromagnetism from 2K to 300K.

Contribution

It demonstrates ferromagnetism in manganese at the nanoscale and provides a detailed analysis of its magnetic properties within a two-dimensional confinement.

Findings

Ferromagnetic behavior observed in manganese nanosheets.

Persistent coercivity across the entire temperature range.

Susceptibility explained by a 2D Heisenberg model.

Abstract

Ferromagnetic behaviour has been observed experimentally for the first time in nanostructured Manganese. Ultrathin ($\sim$ 0.6 nm) Manganese nanosheets have been synthesized inside the two dimensional channels of sol-gel derived Na-4 mica. The magnetic properties of the confined system are measured within 2K-300K temperature range. The confined structure is found to show a ferromagnetic behaviour with a nonzero coercivity value. The coercivity value remains positive throughout the entire temperature range of measurement. The experimental variation of susceptibility as a function of temperature has been satisfactorily explained on the basis of a two dimensional system with a Heisenberg Hamiltonian involving direct exchange interaction.