Computational Studies of Dynamical Phenomena in Nanoscale Ferromagnets

小行星9520325 该项目是真实的材料计算方法（CARM 95）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在纳米级上存储单个比特的状态。 同时，对于薄膜、晶须和单畴晶粒的限制性几何结构中铁磁性的模型和实际基本行为的理解充其量也是初步的。 研究人员建议进一步开发和利用Novotny开发的加速（蒙特卡罗马尔可夫吸收链算法）来研究纳米级领域真实的铁磁体中的动力学现象。 研究人员正在佛罗里达州立大学的超级计算机计算研究所开发SP-2的代码。 然后，他们将在康奈尔大学的SP-2上进行生产运行。 这些计算与工程磁性材料在这一规模上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。 %此项目是真实的材料计算方法（CARM 95）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支持这项研究。基本问题和技术问题推动了这项工作。 磁海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。 与此同时，在薄膜、晶须和单畴晶粒的限制性几何结构中，对铁磁性的模型和现实基本行为的理解充其量也是初步的。 研究人员建议进一步开发和利用Novotny开发的计算机算法，该算法比其他算法快得多。 该项目模拟了真实的铁磁体在数千个原子的尺度上随时间演变的现象。 研究人员正在佛罗里达州立大学的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运行。 这些计算将结合工程磁性材料在这一尺度上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。 ***

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. ***