Cross coupling between electric and magnetic orders in a multiferroic metal-organic framework

Abstract

The coexistence of both electric and magnetic orders in some metal-organic frameworks (MOFs) has yielded a new class of multiferroics beyond inorganic materials. However, the coupling between two orders in multiferroic MOFs has not been convincingly verified yet. Here we present clear experimental evidences of cross coupling between electric and magnetic orders in a multiferroic MOF [(CH3)2NH2]Fe(HCOO)3 with a perovskite structure. The dielelectric constant exhibit a hump just at the magnetic ordering temperature TN. Moreover, both the direct (magnetic field control of dielectric properties) and converse (electric field control of magnetization) magnetoelectric effects have been observed in the multiferroic state. This work opens up new insights on the origin of ferroelectricity in MOFs and highlights their promise as magnetoelectric multiferroics.

Magnetic field-temperature phase diagram of multiferroic [(CH3)2NH2]Mn(HCOO)3<

“…13,14 Cross-coupling between the electric and magnetic orders has been observed, [15][16][17][18] and low temperature phase separation leads to quantum tunneling of the magnetization. 19 Figure 1 displays the crystal structure of this compound and summarizes the aforementioned energy scales.…”

Synthesis and characterization of novel niccolites [(CH3)2NH2][FeIIIMII(HCOO)6] (MII= Zn, Ni, Cu)

“…Recently, a lot of attention was focused on the metal formate frameworks as potential ferroelectrics or multiferroics. [1][2][3][4][5][6][7][8][9][10][11][12] Some of these compounds were also shown to possess good gas sorption and luminescent properties. 13,14 Compounds with the perovskite architecture of general formula [(CH 3 ) 2 3 ].…”

A computational view of the change in the geometric and electronic properties of perovskites caused by the partial substitution of Pb by Sn

“…The possible ferroelectric order in these systems has also been investigated. [42][43][44][45][46][47][48] In spite of the wide interest in halide perovskites, the characterization of their hybrid structures and the understanding of their chemical and physical properties are still in an early stage. For instance, the different phase structures of mixed Sn/Pb halide perovskites at different environments and the corresponding electronic properties, have not been investigated.…”