Muon spin relaxation investigation of magnetic ordering in the hybrid organic-inorganic perovskites [(CH3)2NH2]M(HCOO)3, M = Ni,Co,Mn,Cu

TL;DR

This study uses muon spin relaxation to investigate magnetic ordering and spin reorientation in hybrid organic-inorganic perovskites with various metal ions, revealing differences in magnetic behavior and dimensionality.

Contribution

It provides new insights into the magnetic properties and spin dynamics of these multiferroic materials using muon spin relaxation techniques.

Findings

Weak ferromagnetism observed in all samples.

Copper system shows quasi-one-dimensional magnetic behavior.

Multiferroic samples exhibit three-dimensional antiferromagnetic interactions.

Abstract

Muon spin relaxation measurements are reported on samples of dimethylammonium metal formates containing magnetic divalent nickel, cobalt, manganese, and copper ions. These hybrid organic-inorganic perovskites exhibit weak ferromagnetism and are, apart from the copper system, multiferroics with well separated magnetic and antiferroelectric transitions. We use muons to follow the sublattice magnetization, observing the effect of the spin reorientation transitions below TN and the criticality approaching TN. The multiferroic samples have three-dimensional antiferromagnetic interactions, but the copper sample shows quasi-one-dimensional behavior due to its Jahn-Teller distorted structure, with a ratio of its inter- and intrachain exchange constants j/J=0.037.