Wei Yanping, Zhang Wenjing, Lv Bing, Xu Xia, Xi Shibo, Ma Zijun
College of Science, Gansu Agricultural University, Lanzhou 730070, China.
Key Lab for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China.
Sci Adv. 2021 Jan 20;7(4). doi: 10.1126/sciadv.abc5053. Print 2021 Jan.
For most magnetic materials, ultralow damping is of key importance for spintronic and spin-orbitronic applications, but the number of materials suitable for charge-based spintronic and spin-orbitronic applications is limited because of magnon-electron scattering. However, some theoretical approaches including the breathing Fermi surface model, generalized torque correlation model, scattering theory, and linear response damping model have been presented for the quantitative calculation of transition metallic ferromagnet damping. For the Fe-Co alloy, an ultralow intrinsic damping approaching 10 was first theoretically predicted using a linear response damping model by Mankovsky and then experimentally observed by Schoen Here, we experimentally report a damping parameter approaching 1.5 × 10 for traditional fundamental iron aluminide (FeAl) soft ferromagnets that is comparable to those of 3d transition metallic ferromagnets and explain this phenomenon based on the principle of minimum electron density of states.
对于大多数磁性材料而言，超低阻尼对于自旋电子学和自旋轨道电子学应用至关重要，但由于磁振子-电子散射，适用于基于电荷的自旋电子学和自旋轨道电子学应用的材料数量有限。然而，已经提出了一些理论方法，包括呼吸费米面模型、广义扭矩相关模型、散射理论和线性响应阻尼模型，用于定量计算过渡金属铁磁体的阻尼。对于铁钴合金，曼科夫斯基首先使用线性响应阻尼模型从理论上预测了接近10的超低本征阻尼，随后舍恩通过实验观察到了这一结果。在此，我们通过实验报告了传统的基本铁铝化物（FeAl）软铁磁体的阻尼参数接近1.5×10，这与3d过渡金属铁磁体的阻尼参数相当，并基于态密度最小原理对这一现象进行了解释。
