Study on Giant Magnetoresistance of Magnetic-particle-dispersed Metal Films

巨磁电阻（GMR）效应被观察到的颗粒磁性材料以及多层膜。这种粒状材料通常是通过热沉淀法生产的。因此，颗粒尺寸和浓度很难独立控制。在这项研究中，开发了一种新的工艺来生产具有更可控结构的颗粒材料，并检查了由该工艺获得的样品的磁阻。研究结果如下：1.本工作开发的一种新工艺可以原位生长出嵌有Co或Ni-Fe微粒的金属薄膜.颗粒半径可以从约4 nm到10 nm变化。3.基体中颗粒浓度可控.用该方法制备的Cu薄膜中嵌入了4 nm Co颗粒，显示出巨磁电阻效应，表明该方法具有制备纳米结构可控的磁性颗粒薄膜的潜力，对研究巨磁电阻效应具有重要意义。

Giant magnetoresistance (GMR) effects are observed for granular magnetic materials as well as for mutilayred films. Such granular materials are generally produced through thermal perticipation. So, granule size and concentration are hardly controlled independently. In this study, a new process was developed for producing granular materials with more controlled structures, and the magnetoresistance of specimens obtained by the process was examined. The results are summarized as follows.1. A new process developed in this work allows in-situ growth of metal films with embedded Co or Ni-Fe fine particles.2. Particle radius can be changed from about 4 nm to 10 nm.3. Particle concentration in the matrix can be controlled.4. Cu films with embedded 4-nm Co particles produced by the new process shows GMR effects.These results suggest that the developed method has strong potentiality for producing magnetic granular films with controlled nano-structures which are very useful for the studies on GMR effects.