Crystalline Growth And Domain Study Of Rare Earth Magnetic Materials RMn₆Sn₆

Recently,Rare earth materials RMn6Sn6 ushered in a new wave of research boom.Rare earths are y by non-magnetic atoms YMn6Sn6 due to various magnetic structures regulated by magnetic field and topological Hall effect at near room temperature,experimental and theoretical work on its transport properties,specific magnetic structures and band structures has been ongoing since 2018.The TbMn6Sn6 of rare earth Tb is caused by Chern energy gap.The reason is that this family of materials has kagome layers of transition element Mn,A special magnetic lattice brings RMn6Sn6 intrinsic topological properties.On the other hand,the existence of different rare earth R sites also brings rich and diverse magnetic structures to the system.Focusing on RMn6Sn6 magnetism,the work is mainly divided into the following aspects:(1)Nine kinds of high-quality different R sites single crystals RMn6Sn6 were grown by flux method and six of them were selected to measure the magnetic properties.Based on this,the measurement of single crystal TbMn6Sn6 and DyMn6Sn6 domain is completed.(2)DyMn6Sn6 domain detection of single crystals.Two different types of magnetic domains were observed in DyMn6Sn6 single crystal by magneto-optic Kerr microscope.Through temperature change and field addition experiments,the mutual transformation of the two domains and the variation of their magnetic fields with temperature were found.The reasons for domain change are explained.At the same time,type-I domain is more stable than type-Ⅱdomain.Based on the above experimental results,we have made a DyMn6Sn6 distribution phase diagram of magnetic domains.(3)TbMn6Sn6 domain detection of single crystals.The TbMn6Sn6 domains are also detected by magneto-optic Kerr microscope,but compared with DyMn6Sn6,the domains in the TbMn6Sn6 are simpler.There is only one type of domain in the TbMnbSnb and is similar to the type-I domain in the DyMn6Sn6.We have observed the evolution process of this domain through temperature and magnetic field experiments,and analyzed the evolution reasons,which are completely consistent with the results of existing studies,and prove the previous conclusions.