反铁磁交换作用对纳米线动力学行为的影响  

Effect of Antiferromagnetic Exchange Interaction on the Dynamic Behavior of Nanowires Magnetic Nanowires

作　　者：鲜于正楠 杜安[2] XIANYU Zhengnan;DU An(Shenyang University of Chemical Technology,Shenyang 110142,China;Northeastern University,Shenyang 110819,China)

机构地区：[1]沈阳化工大学理学院,辽宁沈阳110142 [2]东北大学理学院,辽宁沈阳110819

出　　处：《沈阳化工大学学报》2023年第3期283-287,共5页Journal of Shenyang University of Chemical Technology

基　　金：辽宁省教育厅青年育苗项目(LQ2020014)。

摘　　要：当核壳结构磁性纳米线用作高密度磁存储单元时,系统的共振频率会限制其磁存储速率的上限值.为了探究反铁磁界面交换作用对核壳结构磁性纳米线磁共振行为的影响,通过微磁学模拟方法对系统的动力学行为进行研究.研究了具有反铁磁界面交换作用的系统和纯铁磁系统.首先,讨论界面交换作用对系统磁共振行为的影响,发现具有反铁磁界面交换作用的系统的磁共振频率会略高于铁磁系统.然后,讨论外加直流场对系统共振频率和共振线宽的影响,发现具有反铁磁界面交换作用的系统的共振线宽和外加直流场的强度呈非线性关系.最后,讨论温度对系统磁共振行为的影响,发现纯铁磁系统的热稳定性要强于具有反铁磁界面交换作用的系统.When core-shell magnetic nanowires are used as high-density magnetic storage units,the upper limit of magnetic storage rate is limited by the resonant frequency of the system.In order to investigate the effect of antiferromagnetic interfacial exchange interaction on the resonance behavior of core-shell magnetic nanowires,the dynamic behavior of the system was studied by means of micromagnetic simulation.In this study,two systems were considered,namely the system with ferromagnetic interfacial exchange interaction and the system with antiferromagnetic interfacial exchange interaction.Firstly,the effect of interfacial exchange interactionon the magnetic resonance behavior of the system was discussed.It was found that the magnetic resonance frequency of the system with antiferromagnetic interfacial exchange interactionwas slightly higher than that of the ferromagnetic system.Then the influence of the external DC magneticfield on the resonance frequency and resonance linewidth of the system was discussed.It was found that the resonance linewidth of the system with antiferromagnetic interfacialexchangeinteractionwas nonlinear to the intensity of the external DC magneticfield.Finally,the influence of temperature on the magnetic resonance behavior of the systems was discussed.It was found that the thermal stability of ferromagnetic system was stronger than that of the system with antiferromagnetic interfacial exchange interaction.

关 键 词：核壳结构纳米线 微磁学模拟 动力学行为 共振频率 

分 类 号：O482.534[理学—固体物理]