Advanced functional materials: discovery of large coercive field in two dimensional spin glass
two-dimensional materials with specific topological structure spin fault resistance characteristics generally show strange magnetic properties. Most of the studies based on kagome's theory are focused on the two-dimensional hexagonal lattice. Among them the ground state of honeycomb lattice is a semiclassical n é El ordered state with small quantum fluctuations which is very novel in theory. However it is difficult for real compounds to have ideal honeycomb lattices which often show varying degrees of distortion. One of the common distortions is that the two sides of the hexagon are significantly shortened to form a dimeric honeycomb lattice or square lattice with mixed spin. Interestingly the lattice exists in the famous magnetic insulator tlcucl3 the Bose Einstein condensation of Magnon is observed in the material. Therefore dimer honeycomb lattice can be used as a model system to study quantum phase transition. However up to now only a few dimeric honeycomb lattices with half integer spin centers have been reported none with integer spin centers have been reported.

Professor Zheng Yanzhen Institute of Frontier Science technology Xi'an Jiaotong University associate researcher Fu Zhendong Songshanhu material laboratory Dongguan have reported a two-dimensional van der Waals magnetic material [Fe (4-etpy) 2 (N3) 2] n (Fen) composed of dimeric honeycomb lattice with integer spin. The results of TEM SEM AFM show that the samples are stacked in layers the thinnest part is about 13 nm thick which is equivalent to ten layers of single-layer compound. Different from the common magnetic properties of long-range magnetic ordering Mossbauer spectroscopy polarized neutron scattering studies show that the material exhibits a reentrant spin glass behavior due to the exchange coupling interaction between ferromagnetism antiferromagnetism in the lattice has spin glass phases with different tilt angles at 39 K 28 K. Using cur é ly model two exchange coupling constants (J1 = 35.8cm − 1 J2 = − 3.7cm − 1) can be simulated. By analyzing the polarized neutron scattering data in the temperature range of 3.3 to 100k it is found that the magnetic interaction between the two-dimensional magnetic layers is effectively blocked. The further simulation of magnetic scattering also shows that the short-range spin correlation of the material has two-dimensional properties. The hysteresis loop measurement at 2 K shows that the material has a very large coercive field of 1.9 Tesla which proves that the material is a "very hard" two-dimensional van der Waals magnet. The researchers of
firmly believe that the combination of two-dimensional magnets topological spin frustration can produce some novel physical phenomena material properties which may open up a new direction for research. The follow-up work will start from reducing the thickness of the material designing a new ideal topology to further reveal the characteristics of this kind of two-dimensional magnetic materials. Relevant results are published online in advanced functional materials
MIS-ASIA is an online content marketing platform that has a large number of visitors worldwide. It is considered to be the leading IT, mechanical, chemical, and nanomaterial information distributor in the Asia-Pacific region. The MIS-ASIA website provides high-quality articles and news on digital information technology, mechanical technology, nanotechnology, biology and science for scientists, engineers and industry experts, machinery suppliers and buyers, chemical suppliers and laboratories. If you need advertising and posting service, or you need to start sponsorship, please contact us.Related Articles
Atom-thin transistor uses half the voltage of commo
A megalibrary of nanoparticles
Avoiding the Crack of Doom
Eco-friendly method for the synthesis of iron oxide
Challenge: Container to Keep Cool for 48 Hrs even
Nanoparticles in lithium-sulphur batteries detected
Artificial intelligence system plays with individua
This flexible and rechargeable battery is 10 times