铁铂纳米粒子中强自旋轨道诱导的Gilbert阻尼和g位移
Strong spin-orbit induced Gilbert damping and g-shift in iron-platinum nanoparticles
摘要：
高度分散的、化学无序的Fe_{0.2} Pt_{0.8}纳米球的铁磁共振谱的形状由Landau-Lifshitz-Gilbert（LLG）方程的解完美地描述，排除了结晶各向异性和超顺磁波动的影响。在降低温度时，LLG阻尼$α(T)$和负g偏移g（T）-g_0与从磁化等温线的朗之万分析确定的颗粒磁矩成比例地增加。这些新的功能被解释为散射的$q \to 0$磁振子从电子空穴（e/h）对介导的自旋轨道耦合，而sd交换可以被排除。大的饱和值$α(0)=0.76$和$g(0)/g_0-1=-0.37$表明过阻尼1 meV e/h对的主导地位，该对似乎源自d_p=3 nm纳米颗粒中巡回电子的离散能级。
英文摘要：
The shape of ferromagnetic resonance spectra of highly dispersed, chemically disordered Fe_{0.2}Pt_{0.8} nanospheres is perfectly described by the solution of the Landau-Lifshitz-Gilbert (LLG) equation excluding effects by crystalline anisotropy and superparamagnetic fluctuations. Upon decreasing temperature, the LLG damping $α(T)$ and a negative g-shift, g(T)-g_0, increase proportional to the particle magnetic moments determined from the Langevin analysis of the magnetization isotherms. These novel features are explained by the scattering of the $q \to 0$ magnon from an electron-hole (e/h) pair mediated by the spin-orbit coupling, while the sd-exchange can be ruled out. The large saturation values, $α(0)=0.76$ and $g(0)/g_0-1=-0.37$, indicate the dominance of an overdamped 1 meV e/h-pair which seems to originate from the discrete levels of the itinerant electrons in the d_p=3 nm nanoparticles.
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