论文摘要
随着半导体和镀膜技术的飞速发展,器件的尺寸已进入到微/纳米尺度。当薄膜厚度减小至超薄膜时,其结构、微结构、热物性和磁性均与大块材料有很大不同。由于量子效应、物质的局限性和巨大的表面及界面效应,使微尺度下的热物性产生了明显的尺寸效应,器件的热学性质引起人们的关注.现代技术中,薄膜尤其是超薄薄膜在微机械和微电子器件中占有重要地位,因此对薄膜的热动力学性质分析对器件的研究和发展具有重要意义。 量子Heisenberg模型适用于磁性绝缘体,被广泛应用于铁磁与反铁磁自旋波理论中,并取得成功。理论上,人们发展了许多近似方法:如平均场理论(简称MFT)、重正化群、MonteCarlo方法和有效分子场等。通常采用平均场理论或改进的平均场理论,使用合理的自旋统计模型来研究磁性金属薄膜的性质。遗憾的是对平均场理论的高次修正极难处理,因此非常有必要找到一种既简单又有效,高次修正也能系统处理的计算磁性薄膜的理论方法。近年来,国内外理论研究方面的学者们在应用变分累积(简称VCE)方法处理层状模型的临界点时发现该方法显示了很大的优势,其在格点规范场模型研究中也一直被证明是非常有效的方法。 本文以量子Heisenberg模型为基础研究了磁性薄膜的热动力学性质。
论文目录
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