Formation of binary magnon polaron in a two-dimensional artificial magneto-elastic crystal

IF 8.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Npg Asia Materials Pub Date : 2023-09-29 DOI:10.1038/s41427-023-00499-4

Sudip Majumder, J. L. Drobitch, Supriyo Bandyopadhyay, Anjan Barman

{"title":"Formation of binary magnon polaron in a two-dimensional artificial magneto-elastic crystal","authors":"Sudip Majumder, J. L. Drobitch, Supriyo Bandyopadhyay, Anjan Barman","doi":"10.1038/s41427-023-00499-4","DOIUrl":null,"url":null,"abstract":"Abstract We observed strong tripartite magnon-phonon-magnon coupling in a two-dimensional periodic array of magnetostrictive nanomagnets deposited on a piezoelectric substrate, forming a 2D magnetoelastic “crystal”; the coupling occurred between two Kittel-type spin wave (magnon) modes and a (non-Kittel) magnetoelastic spin wave mode caused by a surface acoustic wave (SAW) (phonons). The strongest coupling occurred when the frequencies and wavevectors of the three modes matched, leading to perfect phase matching. We achieved this condition by carefully engineering the frequency of the SAW, the nanomagnet dimensions and the bias magnetic field that determined the frequencies of the two Kittel-type modes. The strong coupling (cooperativity factor exceeding unity) led to the formation of a new quasi-particle, called a binary magnon-polaron, accompanied by nearly complete (~100%) transfer of energy from the magnetoelastic mode to the two Kittel-type modes. This coupling phenomenon exhibited significant anisotropy since the array did not have rotational symmetry in space. The experimental observations were in good agreement with the theoretical simulations.","PeriodicalId":19382,"journal":{"name":"Npg Asia Materials","volume":"23 1","pages":"0"},"PeriodicalIF":8.6000,"publicationDate":"2023-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Npg Asia Materials","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1038/s41427-023-00499-4","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Abstract We observed strong tripartite magnon-phonon-magnon coupling in a two-dimensional periodic array of magnetostrictive nanomagnets deposited on a piezoelectric substrate, forming a 2D magnetoelastic “crystal”; the coupling occurred between two Kittel-type spin wave (magnon) modes and a (non-Kittel) magnetoelastic spin wave mode caused by a surface acoustic wave (SAW) (phonons). The strongest coupling occurred when the frequencies and wavevectors of the three modes matched, leading to perfect phase matching. We achieved this condition by carefully engineering the frequency of the SAW, the nanomagnet dimensions and the bias magnetic field that determined the frequencies of the two Kittel-type modes. The strong coupling (cooperativity factor exceeding unity) led to the formation of a new quasi-particle, called a binary magnon-polaron, accompanied by nearly complete (~100%) transfer of energy from the magnetoelastic mode to the two Kittel-type modes. This coupling phenomenon exhibited significant anisotropy since the array did not have rotational symmetry in space. The experimental observations were in good agreement with the theoretical simulations.

Abstract Image

查看原文本刊更多论文

二维人工磁弹性晶体中二元磁振子极化子的形成

摘要:我们观察到磁致伸缩纳米磁体沉积在压电衬底上的二维周期阵列中存在强的磁-声子-磁-磁耦合，形成二维磁弹性“晶体”;耦合发生在两种基特尔型自旋波(磁振子)模式和由表面声波(声子)引起的(非基特尔)磁弹性自旋波模式之间。当三种模式的频率和波向量相匹配时，耦合最强，相位匹配完美。我们通过精心设计SAW的频率、纳米磁铁尺寸和决定两种kittel型模式频率的偏置磁场来实现这一条件。强耦合(协同因子超过1)导致了一种新的准粒子的形成，称为二元磁non-极化子，伴随着几乎完全(~100%)的能量从磁弹性模式转移到两个kittel型模式。这种耦合现象表现出明显的各向异性，因为阵列在空间上不具有旋转对称性。实验结果与理论模拟结果吻合较好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Npg Asia Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

15.40

自引率

1.00%

发文量

审稿时长

2 months

期刊介绍： NPG Asia Materials is an open access, international journal that publishes peer-reviewed review and primary research articles in the field of materials sciences. The journal has a global outlook and reach, with a base in the Asia-Pacific region to reflect the significant and growing output of materials research from this area. The target audience for NPG Asia Materials is scientists and researchers involved in materials research, covering a wide range of disciplines including physical and chemical sciences, biotechnology, and nanotechnology. The journal particularly welcomes high-quality articles from rapidly advancing areas that bridge the gap between materials science and engineering, as well as the classical disciplines of physics, chemistry, and biology. NPG Asia Materials is abstracted/indexed in Journal Citation Reports/Science Edition Web of Knowledge, Google Scholar, Chemical Abstract Services, Scopus, Ulrichsweb (ProQuest), and Scirus.