【作者】 陈水源；

【导师】 黄志高；

【作者基本信息】 福建师范大学 ， 理论物理， 2002， 硕士

【摘要】 磁电阻效应是磁性材料中一种特殊的磁效应，它体现在一定的温度下材料的电阻率随外加磁场变化的大小。人们对磁电阻效应的研究主要在于最近的十年间，继1988年Baibich等人在磁性多层膜Fe／Co中发现了磁电阻效应后，1993年Helmolt等人在La_2／3Ba_1／3MnO_x等镧锰氧化物薄膜材料中也发现了磁电阻效应。至此，掀起了人们对磁电阻研究的热潮。由于磁电阻效应具有其潜在的理论研究和实际应用价值，使得人们至今对这一效应的研究仍有很大的兴趣。 在本文中，我们较为系统的阐述了磁电阻效应发现、发展过程；如何从实验上制备出具有磁电阻效应的磁性材料；从实验研究角度考虑，设计了一套高、低温电阻、磁电阻测量系统；并利用该系统测量了实验上制备得到的磁电阻材料的电阻、磁电阻特性，对所得到的数据进行了分析、处理；提出一个物理模型，利用MonteCarlo模拟方法对磁电阻效应产生的机理作了初步的分析。得到了一定的结果，初步解释实验中观察到的在一定温度范围内的磁电阻现象。更多还原

【Abstract】 As one of magnetism properties in the magnetism materials, magnetoresistance （MR） effect shows the magnitude about resistivity dependence of the magnetic field .The time when people focus on magnetoresistance effect is the last ten years.After MR effect was discovered from the multilayered films Fe/Co by Baibich et al in 1988, Helmolt et al got the same result from La_2／3Ba_1／3MnO_x films. From that on, more effort to study the MR effect were made. For the reason that the MR effect has us potential values in theoretical and practical research,One are still interested in the study of the MR effect.In this thesis, we give a systematic discussion on the discovery and the process of the study of magnetoresistance effect, how to get the materials which can make MR effect. From the experimental study point of view, we devise a scaling system for high （low）-temperature resistance and magnetoresistance, by using the system, the resistance and magnetoresistance properties of the materials is investigated. We propose a model to analysis the mechanism of MR effect by using a Monte Carlo technique We present the results of our Monte Carlo calculation in the last part of the thesis To some extent, theoretical calculation is found to be agreement with experimental results.更多还原