S. V. Grigoriev, L. A. Azarova, K. A. Pshenichnyi, O. I. Utesov
{"title":"Dispersion Relation in Amorphous Ferromagnets","authors":"S. V. Grigoriev, L. A. Azarova, K. A. Pshenichnyi, O. I. Utesov","doi":"10.1134/s1063776123100059","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Dispersion of spin waves in the amorphous ferromagnetic alloy Fe<sub>48</sub>Ni<sub>34</sub>P<sub>18</sub> can be described within the model of a ferromagnet with random anisotropy: <span>\\(\\epsilon \\)</span>(<i>q</i>) = <i>Aq</i><sup>2</sup> + <i>g</i>μ<sub>B</sub><i>H</i> + δω(<i>q</i>), where δω(<i>q</i>) is an additional term linear in |<i>q</i>|. The method of small-angle scattering of polarized neutrons is used to prove the importance of the additional term δω(<i>q</i>) in dispersion. The measurements are carried out for different values of the external magnetic field <i>H</i> and neutron wavelength λ. The scattering map of neutrons represents a circle centered at the point <i>q</i> = 0. The stiffness <i>A</i> of spin waves is derived directly from the λ-dependence of the radius of this circle. The spin-wave stiffness <i>A</i> of the amorphous alloy weakly decreases from 140 to 110 meV Å<sup>2</sup> as temperature increases from 50 to 300 K. The field dependence of the radius demonstrates the presence of an additional term δω(<i>q</i>) in the form of an energy gap that is almost independent of field and temperature. The value of the additional term is Δ = 0.015 ± 0.002 meV.</p>","PeriodicalId":629,"journal":{"name":"Journal of Experimental and Theoretical Physics","volume":null,"pages":null},"PeriodicalIF":1.0000,"publicationDate":"2023-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Experimental and Theoretical Physics","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1134/s1063776123100059","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
Dispersion of spin waves in the amorphous ferromagnetic alloy Fe48Ni34P18 can be described within the model of a ferromagnet with random anisotropy: \(\epsilon \)(q) = Aq2 + gμBH + δω(q), where δω(q) is an additional term linear in |q|. The method of small-angle scattering of polarized neutrons is used to prove the importance of the additional term δω(q) in dispersion. The measurements are carried out for different values of the external magnetic field H and neutron wavelength λ. The scattering map of neutrons represents a circle centered at the point q = 0. The stiffness A of spin waves is derived directly from the λ-dependence of the radius of this circle. The spin-wave stiffness A of the amorphous alloy weakly decreases from 140 to 110 meV Å2 as temperature increases from 50 to 300 K. The field dependence of the radius demonstrates the presence of an additional term δω(q) in the form of an energy gap that is almost independent of field and temperature. The value of the additional term is Δ = 0.015 ± 0.002 meV.
AbstractDispersion of spin waves in the amorphous ferromagnetic alloy Fe48Ni34P18 can be described within the model of a ferromagnet with random anisotropy：\(\epsilon \)(q) = Aq2 + gμBH + δω(q)，其中 δω(q)是与|q|线性的附加项。利用极化中子的小角散射方法证明了附加项 δω(q) 在色散中的重要性。测量对外部磁场 H 和中子波长 λ 的不同值进行。中子散射图表示一个以 q = 0 点为中心的圆。随着温度从 50 K 上升到 300 K，非晶合金的自旋波刚度 A 从 140 meV Å2 微弱下降到 110 meV Å2。半径的磁场依赖性证明了能隙形式的附加项 δω(q)的存在，它几乎与磁场和温度无关。附加项的值Δ = 0.015 ± 0.002 meV。
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Journal of Experimental and Theoretical Physics is one of the most influential physics research journals. Originally based on Russia, this international journal now welcomes manuscripts from all countries in the English or Russian language. It publishes original papers on fundamental theoretical and experimental research in all fields of physics: from solids and liquids to elementary particles and astrophysics.
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