Zhang Zhidong and Li Da, researchers of Institute of metals, Chinese Academy of Sciences, have made important progress in the field of magnetic regulation of organic-inorganic hybrid magnets

Unlike traditional metal, alloy and oxide magnets, the magnetism of organic magnets is closely related to the synthesis process In the past few decades, scientists have made many efforts to develop some or all organic magnets, such as molecular magnets, magnetic organic metal frameworks and organic-inorganic hybrid magnetic materials Among them, organic-inorganic hybrid magnets with single crystal structure, which are constructed by inorganic structural fragments and organic molecules, have attracted wide attention Organic molecules have the characteristics of flexibility and easy processing, and organic-inorganic hybrid magnets can have special applications The magnetic ordering temperature is higher than room temperature, which is the precondition for the application of magnetic materials at or above room temperature However, in organic magnets, the magnetic ordering temperature of the magnetic organic-inorganic hybrid materials reported in the literature is lower than 200 K Zhang Zhidong, researcher and Li Da, researcher of functional materials and Devices Research Department of Shenyang National Research Center for materials science, Institute of metals, Chinese Academy of Sciences, have successfully synthesized iron-based β - fese layered superconductors with soluble Fe and se as precursors, and recently adopted high temperature organic chemical solution method to prepare organic amines (triethylenetetramine, TetA) with high boiling point ）A new type of magnetic organic-inorganic hybrid material with Curie temperature higher than 530k was synthesized by using soluble Fe and Se precursors as raw materials The single-phase (β - fe3se4) 4 [Fe (TetA) 1.5] hybrid nanoflakes are composed of organic ligand Fe (TetA) 1.5 and inorganic structural unit β - fe3se4, which have tetragonal crystal structure The (β - Fe 3Se 4) 4 [Fe (TetA) 1.5] hybrid nanocomposites remained stable at temperatures below 530k and decomposed slowly at temperatures between 530k and 700k The magnetic measurements in the range of 5-900 K show that the (β - Fe 3Se 4) 4 [Fe (TetA) 1.5] hybrid nano sheet has no magnetic phase transition when the temperature is lower than 530 K, and has ferromagnetism at room temperature The Curie temperature of (β - Fe 3Se 4) 4 [Fe (TetA) 1.5] hybrid nanocomposites is not only higher than that of ferromagnetic Fe se binary compounds, but also much higher than that of all reported organic-inorganic hybrid materials The magnetic properties of the hybrid materials were affected by the synthesis conditions, and the hybrid nano films prepared at 483k showed hard magnetic properties Researchers Han Zheng, Li Min and Yang Teng provided important support in the structural and magnetic analysis of hybrid materials Dr chinwei Wang of Taiwan Synchrotron Radiation Research Center and Professor chuljin Choi of Korean Institute of materials science also participated in this work The results were published in Chem Mater (DOI: 10.1021 / ACS Chemmater 8b04814) This work was supported by NSFC and key R & D projects of the Ministry of science and technology.