从理论上研究了温度和无序度对磁振子晶体Fe $_{1-c}$ Co $_{c}$自旋波谱的影响。我们的形式主义是基于分析的海森堡哈密顿的波矢量和频率依赖的横向磁化率的装置。进入模型的交换积分由\emph{ab initio}磁力定理得到。为了解释有限温度下磁振子谱的软化，我们采用相干势近似处理无序和无规相近似。该合金在自旋电子学应用中表现出许多有利的特性。除了高居里温度外，它的磁振子带隙在高温下保持稳定，并且在很大程度上不受无序的影响。我们特别注意合金化引入的磁振子的衰减。阻尼原来是一个非单调的函数的杂质浓度，由于非平凡的演变的交换积分的值与Co浓度。磁振子的无序诱导阻尼估计比它们的朗道阻尼小得多。
英文摘要：
We study theoretically the influence of the temperature and disorder on the spin wave spectrum of the magnonic crystal Fe$_{1-c}$Co$_{c}$. Our formalism is based on the analysis of a Heisenberg Hamiltonian by means of the wave vector and frequency dependent transverse magnetic susceptibility. The exchange integrals entering the model are obtained from the \emph{ab initio} magnetic force theorem. The coherent potential approximation is employed to treat the disorder and random phase approximation in order to account for the softening of the magnon spectrum at finite temperatures. The alloy turns out to exhibit many advantageous properties for spintronic applications. Apart from high Curie temperature, its magnonic bandgap remains stable at elevated temperatures and is largely unaffected by the disorder. We pay particular attention to the attenuation of magnons introduced by the alloying. The damping turns out to be a non-monotonic function of the impurity concentration due to the non-trivial evolution of the value of exchange integrals with the Co concentration. The disorder induced damping of magnons is estimated to be much smaller than their Landau damping.
Machine learning for the design and prediction of soft-magnetic electromagnetic shielding FeCo-based alloys in laser cladding
Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University（东北大学材料科学与工程学院各向异性和纹理材料教育部重点实验室）；Shenyang Dalu Laser Technology Co. Ltd.（沈阳大路激光科技有限公司）；The Department of Mechanical Engineering, National University of Singapore（新加坡国立大学机械工程系）
Alloying Controlled Tuning of Interfacial Spin Orbit Interaction and Magnetic Damping in Crystalline FeCo Alloys
Technical University of Munich（慕尼黑工业大学）；University of Regensburg（雷根斯堡大学）；Fudan University（复旦大学）；Munich Center for Quantum Science and Technology (MCQST)（慕尼黑量子科学与技术中心）；Center for Quantum Engineering (ZQE)（量子工程中心）
Laser-generated GHz surface acoustic waves with tunable amplitude during the magnetostructural phase transition in FeRh thin films
Ioffe Institute（约费研究所）；P.N. Lebedev Physical Institute of the RAS（俄罗斯科学院列别杰夫物理研究所）；Institute of Metal Physics of the Ural Branch of the RAS（俄罗斯科学院乌拉尔分校金属物理研究所）；Faculty of Mechanical Engineering, University of Ljubljana（卢布尔雅那大学机械工程学院）；Lomonosov Moscow State University（莫斯科罗蒙诺索夫国立大学）
