Local Ferromagnetism in Microporous Carbon with the Structural Regularity of Zeolite Y

TL;DR

This study demonstrates high-temperature ferromagnetism in microporous carbon with a zeolite Y-like structure, likely caused by topological disorder, and reveals a percolative transition influenced by isolated magnetic clusters.

Contribution

It provides the first evidence of high-temperature ferromagnetism in microporous carbon with a regular nano-array structure, linking magnetic behavior to topological disorder and cluster dynamics.

Findings

High-temperature ferromagnetism observed in microporous carbon

Magnetic behavior governed by isolated clusters over broad temperature range

Percolative transition suggested with decreasing temperature

Abstract

Magnetization M(H,T) measurements have been performed on microporous carbon (MC) with a three-dimensional nano-array structure corresponding to that of a zeolite Y supercage. The obtained results unambiguously demonstrate the occurrence of high-temperature ferromagnetism in MC, probably originating from a topological disorder associated with curved graphene sheets. The results provide evidence that the ferromagnetic behavior of MC is governed by isolated clusters in a broad temperature range, and suggest the occurrence of percolative-type transition with the temperature lowering. A comparative analysis of the results obtained on MC and related materials is given.