Computational Studies of Dynamical Phenomena in Nanoscale Ferromagnets

9520325诺沃特尼这个项目是真实材料计算方法(CARM95)计划的一部分。材料研究部、高级科学计算部和数学科学部都在支持这项研究。基本问题和技术问题推动了这项工作。磁性海量存储技术正迅速发展到在纳米尺度上存储单个比特的状态。同时，对铁磁性在薄膜、晶须和单畴颗粒的限制几何形状中的模型和现实基本行为的理解充其量也是最基本的。研究人员建议进一步发展和利用Novotny提出的加速算法(蒙特卡洛马尔可夫吸收链算法)来研究纳米尺度下真实铁磁体中的动力学现象。研究人员正在佛罗里达州立大学超级计算机计算研究所开发SP-2上的代码。然后，他们将在康奈尔大学的SP-2上进行生产。这些计算与这种规模的工程磁性材料的最新进展以及使用磁力显微镜对动力学现象的实验研究相结合。%此项目是真实材料计算方法(CARM95)计划的一部分。材料研究部、高级科学计算部和数学科学部都在支持这项研究。基本问题和技术问题推动了这项工作。磁性大容量存储技术正在迅速发展到以数千个原子的规模存储单个比特的状态。同时，对铁磁性在薄膜、晶须和单畴颗粒的限制几何形状中的模型和现实基本行为的理解充其量也是最基本的。研究人员提议进一步开发和利用诺沃特尼开发的一种比其他人快得多的计算机算法。该项目模拟了数千个原子尺度上的真实铁磁体中随时间演化的现象。研究人员正在佛罗里达州立大学超级计算机计算研究所的一台并行计算机上开发代码。然后，他们将在康奈尔大学的一台类似机器上进行生产。这些计算将与这种规模的工程磁性材料的最新进展以及使用磁力显微镜对动力学现象的实验研究相结合。***

9520325 Novotny This project is part of the Computational Approaches to Real Materials (CARM95) program. The Division of Materials Research, Division of Advanced Scientific Computing, and Division of Mathematical Sciences are all supporting this research. Fundamental and technological issues motivate this work. Magnetic mass storage technology is rapidly progressing to the state where single bits are stored on the nanoscale. At the same time, understanding of model and realistic fundamental behavior of ferromagnetism in the restrictive geometries of thin films, whiskers, and single- domain grains is rudimentary at best. The investigators propose to further develop and utilize an acceleration developed by Novotny (the Monte Carlo Markov Absorbing Chain algorithm) to study dynamical phenomena in real ferromagnets in the nanoscale domain. The investigators are developing codes on the SP-2 at the Supercomputer Computations Research Institute at Florida State University. They will then make production runs on the SP-2 at Cornell University. These calculations couple with recent advances in engineering magnetic materials on this scale and on experimental studies of dynamical phenomena using magnetic force microscopies. %%% This project is part of the Computational Approaches to Real Materials (CARM95) program. The Division of Materials Research, Division of Advanced Scientific Computing, and Division of Mathematical Sciences are all supporting this research. Fundamental and technological issues motivate this work. Magnetic mass storage technology is rapidly progressing to the state where single bits are stored on the scale of thousands of atoms. At the same time, understanding of model and realistic fundamental behavior of ferromagnetism in the restrictive geometries of thin films, whiskers, and single-domain grains is rudimentary at best. The investigators propose to further develop and utilize a computer algorithm developed by Novotny that is much f aster than others. The project simulates phenomena that evolve in time in real ferromagnets on the scale of thousands of atoms. The investigators are developing codes on a parallel computer at the Supercomputer Computations Research Institute at Florida State University. They will then make production runs on a similar machine at Cornell University. These calculations will couple with recent advances in engineering magnetic materials on this scale and on experimental studies of dynamical phenomena using magnetic force microscopies. ***