Spin-Wave Dynamics in an Artificial Kagome Spin Ice  

作　　者：Qiuyang Li Suqin Xiong Lina Chen Kaiyuan Zhou Rongxin Xiang Haotian Li Zhenyu Gao Ronghua Liu Youwei Du 李求洋;熊素琴;陈丽娜;周凯元;项荣欣;李浩天;高振宇;刘荣华;都有为(China Electric Power Research Institute,Beijing 100192,China;School of Science,Nanjing University of Posts and Telecommunications,Nanjing 210023,China;School of Physics,Nanjing University,Nanjing 210093,China)

机构地区：[1]China Electric Power Research Institute,Beijing 100192,China [2]School of Science,Nanjing University of Posts and Telecommunications,Nanjing 210023,China [3]School of Physics,Nanjing University,Nanjing 210093,China

出　　处：《Chinese Physics Letters》2021年第4期117-121,共5页中国物理快报（英文版）

基　　金：the State Grid Corporation of China via the Science and Technology Project:Research on Electromagnetic Measurement Technology Based on EIT and TMR(Grant No.JL71-18-007)。

摘　　要：Artificial spin ice(ASI) structures have significant technological potential as reconfigurable metamaterials and magnetic storage media.We investigate the field/frequency-dependent magnetic dynamics of a kagome ASI made of 25-nm-thick permalloy nanomagnet elements,combining magnetoresistance(MR) and microscale ferromagnetic resonance(FMR) techniques.Our FMR spectra show a broadband absorption spectrum from 0.2 GHz to 3 GHz at H below 0.3 kOe,where the magnetic configuration of the kagome ASI is in the multidomain state,because the external magnetic field is below the obtained coercive field Hc~0.3 kOe,based on both the low-field range MR loops and simulations,suggesting that the low-field magnetization dynamics of kagome ASI is dominated by a multimode resonance regime.However,the FMR spectra exhibit five distinctive resonance modes at the highfield quasi-uniform magnetization state.Furthermore,our micromagnetic simulations provide additional spatial resolution of these resonance modes,identifying the presence of two high-frequency primary modes,localized in the horizontal and vertical bars of the ASI,respectively;three other low-frequency modes are mutually exclusive and separately pinned at the corners of the kagome ASI by an edge-induced dipolar field.Our results suggest that an ASI structural design can be adopted as an efficient approach for the development of low-power filters and magnonic devices.

关 键 词：ALLOY MAGNETIZATION CORNERS 

分 类 号：O469[理学—凝聚态物理]