Metal-Organic Framework (MOF) refers to long-range ordered crystalline structures that are linked together by metal ions and organic functional groups. MOF materials have attracted wide attention due to their important application prospects in clean energy, catalysis, adsorption, and environmental protection. In recent years, the M06 group led by Sun Yang, a researcher at the Institute of Physics, Chinese Academy of Sciences/Beijing National Laboratory for Condensed Matter Physics, has conducted research on the magnetoelectric properties of MOF materials and achieved a series of innovative results. For example, the magnetization resonant quantum tunneling effect in MOF has been discovered for the first time [Phys. Rev. Lett. 112, 017202 (2014)]; the magnetoelectric coupling effect in paramagnetic and polyferric states in MOF has been reported first [Sci Rep. 3, 2024 (2013); Sci. Rep. 4, 6062 (2014)]; Magnetoelectric coupling effect near room temperature in a MOF [Phys. Status Solidi RRL 9, 62 (2015)]. Recently, Sun Yang’s research group has made new progress in the field of MOF and discovered a completely new physical effect—the resonant quantum magnetoelectric coupling effect. In 1996, U.S. and Italian scientists observed the magnetization resonant quantum tunneling effect in some single-molecule magnets (such as Mn12), which showed that the macroscopic magnetization appeared regular step transitions with the applied magnetic field. With the magnetization resonant quantum tunneling of single-molecule magnets, solid state qubits are expected to be used for quantum information and quantum computing. However, experimental measurements of magnetization resonant quantum tunneling often require the use of sophisticated and sophisticated experimental equipment such as superconducting quantum interferometers or spectroscopy based on synchrotron radiation sources. In 2014, Sun Yang and graduate student Tian Ying found that a perovskite-structured MOF material [(CH3)2NH2]Fe(HCOO)3 has spontaneous magnetic phase separation, that is, there are antiferromagnetic ordered phases and isolated Single-ion magnets and exhibit magnetization resonant quantum tunneling behavior at low temperatures [PRL 112, 017202 (2014)]. Further studies have found that the Fe-MOF is a multiferroic material with both ferroelectric and magnetic ordering, and exhibits a magnetoelectric coupling effect below the magnetic ordering temperature (~19 K). Therefore, the Fe-MOF becomes a unique multiferroic system with magnetization resonant quantum tunneling and magnetoelectric coupling effects, and the combination of the two may lead to entirely new physical effects. Under the guidance of Sun Yang, graduate students Tian Ying, Shen Shipeng, and Cong Jun-like used the self-developed multi-functional magnetoelectric coupling effect measurement system to accurately measure the magnetoelectric coupling effect of the Fe-MOF at 2 K. The experimental results show that when magnetic resonance resonant quantum tunneling occurs, the magnetic dielectric behavior shows an abnormal spike, indicating that magnetic resonance quantum tunneling can be reflected in the electrical properties through magnetoelectric coupling. Sun Yang named this physical effect as a resonant quantum magnetoelectric effect, and made a qualitative explanation of its microscopic physical mechanism based on the principle of conservation of angular momentum. This discovery for the first time combines magnetization-resonant quantum tunneling with magnetoelectric coupling. Using this resonance effect, the magnetization resonant quantum tunneling can be detected simply by measuring the dielectric behavior under a magnetic field, which is the future magnetization. The practical application of resonant quantum tunneling lays the physical foundation. The above research results were published in the Journal of the American Chemical Society 138, 782-785 (2016). This work was funded by the National Natural Science Foundation of China and the Chinese Academy of Sciences. All Protect Surface Protection Roll Plastic Floor Protector Roll,Plastic Floor Protector,Hardwood Floor Protector,Floor Covering Protection Suzhou Surface Protective New Material Technology Co.,Ltd , https://www.surfaceprotective.com
Resonance quantum magnetoelectric coupling in metal-organic frameworks discovered by physics