Observation of Resonant Quantum Magnetoelectric Effect in a Multiferroic Metal–Organic Framework

Abstract

A resonant quantum magnetoelectric coupling effect has been demonstrated in the multiferroic metal-organic framework of [(CH3)2NH2]Fe(HCOO)3. This material shows a coexistence of a spin-canted antiferromagnetic order and ferroelectricity as well as clear magnetoelectric coupling below TN ≈ 19 K. In addition, a component of single-ion quantum magnets develops below ∼ 8 K because of an intrinsic magnetic phase separation. The stair-shaped magnetic hysteresis loop at 2 K signals resonant quantum tunneling of magnetization. Meanwhile, the magnetic field dependence of dielectric permittivity exhibits sharp peaks just at the critical tunneling fields, evidencing the occurrence of resonant quantum magnetoelectric coupling effect. This resonant effect enables a simple electrical detection of quantum tunneling of magnetization.

Crystal structure of catena-poly[diaqua-(μ2-5-methylisophthalato-κ2 O:O′)(μ2-1,4-bis((1H-1,2,4-triazol-1-yl)methyl)benzene-κ2 N:N′)], NiC21H22O6N6

“…The rational design metal-organic coordination polymers (CPs) have received remarkable attention, not only because of their fascinating architectures and topologies but also because of their potential applications as functional materials [3][4][5][6][7][8]. It is well known that topologies of coordination polymers have a significant impact on their physical and chemical properties [9][10][11][12][13].…”

[(18‐Crown‐6)K][Fe(1)Cl(1)4]0.5[Fe(2)Cl(2)4]0.5: A Multifunctional Molecular Switch of Dielectric, Conductivity and Magnetic Properties

“…Multiple switchable materials are the most important subclass of multifunctional materials, whose physical properties (optical, electrical, magnetic, and/or mechanical properties) can be reversibly modified between two or more relatively stable states by external stimuli such as light, temperature, and electric field. Multiferroic materials are the typical example of multifunctional material that exists the magnetoelectric effect by coupling of ferromagnetism and ferroelectricity, which is even more desirable for constructing multifunctional devices …”

A multiferroic material [NH2-CH+-NH2]Co(HCOO)3 of metal-organic frameworks with weak ferromagnetism and dielectric relaxation

“…1-6 ABX 3 MOFs (A=protonated AmineH + , B=metal ion M, and X=HCOO -) exhibit a perovskite architecture, where the octahedral metal ions are linked by anti-anti formate ligands and the AmineH + cations are located within the cube-like cavities of the framework. 7,8 In perovskite MOFs compounds, the electronic and magnetic properties associated with order/disorder transitions of the [AmineH] + cations and the framework [M(HCOO) 3 ] -, respectively. [9][10][11] So the perovskite MOFs materials can be suitable candidates, as single-phase multiferroic materials with excellent electronic and magnetic properties.…”