Formation of Nano-structure Material Using Chaotic Theory and its Physical Properties

据报道，Fe-Ag纳米层状材料的形成可以通过反复压制和轧制;粉末和箔材的反复塑性变形来生产。对反复轧制后的样品进行了巨磁电阻（GMR）观察。巨磁电阻效应只在单层厚度小于1 nm的多层膜材料中有报道。采用磁控溅射法制备了层厚为10 ~ 100 nm的多层膜样品，并对其进行了表征。在这些材料中，只有10 nm的样品在77 K时表现出0.15%的巨磁阻，而重复轧制法制备的70 nm的样品在77 K时表现出4.5%的巨磁阻。每层厚度由在重复轧制样品中测量的值来模拟。该样品在77 K时的巨磁电阻率为1.5%，说明均匀多层膜样品的巨磁电阻率大于混沌多层膜样品。

It is reported that the formation of Fe-Ag nano-layred material can be produced by repeated pressing and rolling ; the repeated plastic deformation of powder and foil. The specimen producedby the repeated rolling is observed the giant magneto-resistance (GMR). The GMR effect has been only reported in the multilayr material the each layr thickness of which is less than 1nm. While the specimen produced by the repeated rolling shows GMR effect, even if the thickness is about 50nm.In this research, the multilayr samples whose layr thickness from 10nm to 100nm were produced by magnetron sputtering. In these material, only 10nm sample shows GMR,0.15% at 77K.While the 70nm sample produced by the repeatedrolling shows GMR,4.5% at 77K.Since the samples produced by the repeated rolling have the distributed layr thickness, The inhomogeneous multilayr sample produced by sputtering is produced. Each layr thickness was simulated by the value which was measured in the repeated rolling sample. This sample shows GMR,1.5% at 77K.Consequently, GMR of homogeneous multilayr sample is larger than that of chaotic multilayr sample.