Synthesis of Magnetic Granular Materials with GMR and Soft Magnetic Properties by Cluster Deposition Technique

本文提出了一种制备磁性颗粒材料的新方法。在。在该方法中，将压力计大小的铁磁性金属团簇与不同的金属蒸气混合，并将混合物沉积在衬底上。期望能够独立控制颗粒膜中磁性颗粒的大小和密度。研究了该方法制备的Fe/Ag和Co/Ag薄膜的磁性能和巨磁电阻（GMR）。结果总结如下：1。平均直径约为5 nm的Fe和Co团簇在Ag基体中分散良好。在Fe/Ag体系中，随着粒子密度的增加，粒子间磁相互作用增强。当铁含量为35% at%时，Fe/Ag薄膜的矫顽力为5 Oe。在室温下，该膜的GMR比为10%。首次用类居里-魏斯定律描述了压力计粒子系统的磁性行为，并在室温下观察到Fe/Ag薄膜在Fe含量为35% at%时发生了铁磁有序。

A new method to prepare magnetic granular materials has been developed in this hdy. In .I the method manometer-sized clusters of ferromagnetic metal are mixed with a different metal vapor, and the mixture is deposited on the substrate. It is expected to allow the independent control of the size and density of the magnetic particles in the granular film. The magnetic properties and giant magnetoresistance (GMR) were investigated for Fe/Ag and Co/Ag films prepared by this method. The results are summarized as follows.1. Fe and Co clusters with the mean diameter of about 5 nm were well dispersed in Ag matrix.2. Interparticle magnetic interaction became strong with increasing the particle density in Fe/Ag system.3. The coercive force was 5 Oe for the Fe/Ag film with Fe content of 35 at%. Moreover, the film had GMR ratio of 10 % at room temperature.4. For the first time, magnetic behavior described by a Curie-Weiss-like law was observed for manometer particle system, and ferromagnetic ordering at room temperature was observed to take place at the Fe content of 35 at% for Fe/Ag films.