Existence of long-range magnetic order in Heisenberg spin nanoribbons with edge modification  

作　　者：Da-cheng Ma Ling-yi Cui Chu-xiao Sun Xiao-dan Chi Zheng-Nan XianYu An Du 

机构地区：[1]College of Science,Northeastern University,Shenyang 110819,China [2]Department of Basic Science,Dalian Naval Academy,Dalian 116018,China [3]Department of Physics,College of Sciences,Shenyang University of Chemical Technology,Shenyang 110142,China [4]National Frontiers Science Center for Industrial Intelligence and Systems Optimization,Northeastern University,China [5]Key Laboratory of Data Analytics and Optimization for Smart Industry(Northeastern University),Ministry of Education,China

出　　处：《Communications in Theoretical Physics》2024年第7期134-144,共11页理论物理通讯（英文版）

基　　金：supported by the 111 Project(B16009).

摘　　要：Long-range magnetic order appears on a side decorated Heisenberg spin nanoribbon at nonzero temperature,although no spontaneous magnetization exists in a one-or two-dimensional isotropic Heisenberg model at any nonzero temperature according to the Mermin-Wagner theorem.By use of the spin Green's function method,we calculated the magnetizations of Heisenberg nanoribbons decorated by side spins with single-ion anisotropy and found that the system exhibits a nonzero transition temperature,whether the decorated edge spins of the system link together or separate from each other.When the width of the nanoribbon achieves infinite limit,the transition temperatures of the system tend to the same finite constant eventually whether one edge or both edges are decorated by side spins in the nanoribbon.The results reveal that the magnetism of a low-dimensional spin system is different from that of a threedimensional spin system.When the single-ion anisotropy of edge spins in a Heisenberg spin nanoribbon can be modulated by an electric field experimentally,various useful long-range magnetic orders of the system can be obtained.This work can provide a detailed theoretical basis for designing and fabricating next-generation low-dimensional magnetic random-access memory.

关 键 词：NANORIBBON magnetic anisotropy long-range magnetic order Heisenberg model transition temperature 

分 类 号：O469[理学—凝聚态物理]