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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effects of thermal annealing on the magnetic interactions in nanogranular Fe-Ag thin films
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Effects of thermal annealing on the magnetic interactions in nanogranular Fe-Ag thin films

机译：热退火对纳米颗粒Fe-Ag薄膜磁性相互作用的影响

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摘要

In this paper we have studied, by analysing the evolution of the magnetic behaviour during thermal treatment, the role of the interparticle magnetic interactions in Fe_xAg_(100-x) granular thin films prepared by sputtering deposition technique. Two compositions have been selected: x = 25 and 35, below and around the magnetic percolation of the system, respectively, according to our previous works. The structure of these thin films has been studied by X-ray diffraction (XRD) and X-ray absorption spectroscopy (XAS) measurements. To analyse the magnetic behaviour, DC magnetic measurements have been carried out after progressively annealing the samples at different temperatures (0 <= T_(ann) <= 200 °C). These measurements have revealed that, upon thermal treatment, the frustrated state at low temperatures (T<80K) for the x = 25 sample tends to disappear, probably due to the weakening of RKKY interactions after the segregation of soluted Fe atoms in the Ag matrix. However, dipolar interactions are not affected by the annealing. On the contrary, at x = 35, around the magnetic percolation, the annealing gives rise to an increasingly ordered interface, thereby enhancing the transfer of the direct exchange interactions.
机译：在本文中，我们通过分析热处理过程中磁行为的演变，研究了粒子间磁相互作用在通过溅射沉积技术制备的Fe_xAg_（100-x）颗粒状薄膜中的作用。根据我们以前的工作，已经选择了两种成分：x = 25和35，分别在系统的磁渗透以下和附近。这些薄膜的结构已通过X射线衍射（XRD）和X射线吸收光谱（XAS）测量进行了研究。为了分析磁性能，在不同温度（0 <= T_（ann）<= 200°C）下对样品进行逐步退火后，已进行了直流磁测量。这些测量表明，热处理后，x = 25样品在低温（T <80K）下的受挫状态趋于消失，这可能是由于溶质中的Fe原子在Ag基体中分离后RKKY相互作用减弱了。 。但是，偶极相互作用不受退火的影响。相反，在x = 35时，在磁渗透附近，退火会导致界面越来越有序，从而增强了直接交换相互作用的传递。

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