Percolation-Induced Ferrimagnetism from Vacancy Order in [Gua]Mn1–xFe2x/3(HCOO)3 Hybrid Perovskites

TL;DR

This paper shows that vacancy ordering in a hybrid perovskite material leads to bulk ferrimagnetism, offering a new way to design multiferroic materials.

Contribution

The discovery of percolation-induced ferrimagnetism driven by vacancy ordering in hybrid perovskites.

Findings

Vacancy ordering leads to bulk ferrimagnetism when x > 0.6.

Monte Carlo simulations confirm the model's predictions on magnetic susceptibility.

Local magnetization emerges from short-range vacancy order at intermediate compositions.

Abstract

We report the magnetic behavior of the hybrid perovskites
[Gua]Mn1–xFe2x/3□x/3(HCOO)3 (0 ≤ x ≤ 0.88), showing that vacancy
ordering drives bulk
ferrimagnetism for x > 0.6. The behavior is rationalized
in terms of a simple microscopic model of percolation-induced ferrimagnetism.
Monte Carlo simulations driven by this model reproduce the experimental
dependence of magnetic susceptibility on x and show
that, at intermediate compositions, domains of short-range vacancy
order lead to the emergence of local magnetization. Our results open
up a new avenue for the design of multiferroic hybrid perovskites.

Figures