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Kinetic Monte Carlo approach to modeling thermal decay in perpendicular recording media

机译：动力学蒙特卡洛方法模拟垂直记录介质中的热衰减

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摘要

A procedure is developed to study the evolution of high anisotropy magnetic recording media due to thermally activated grain reversal. It is assumed that the system is composed of single domain grains that evolves by passing through a sequence of relatively long-lived metastable states punctuated by abrupt reversals of individual grains. Solutions to the rate equations describing the sequence of metastable states are calculated using kinetic Monte Carlo. Transition rates are formulated from the Arrhenius-Neel expression in terms of the material parameters, temperature, and applied field. Results obtained from this method are shown to be in good agreement with those calculated from finite-temperature micromagnetics. The method is applied to study the rate dependence of finite-temperature M H loops and the thermal degradation of a recorded bit pattern in perpendicular recording media. A significant advantage of the procedure is its ability to extend simulations over time intervals many orders of magnitude greater than is feasible using standard finite-temperature micromagnetics with relatively modest computational effort.
机译：开发了一种程序来研究由于热激活晶粒反转而引起的高各向异性磁记录介质的演变。假定该系统由单畴晶粒组成，该晶粒是通过经历一系列相对长寿的亚稳态形成的，这些亚稳态由单个晶粒的突然反转所打断。使用动力学蒙特卡洛计算描述亚稳状态序列的速率方程的解。转变速率由Arrhenius-Neel表达式根据材料参数，温度和应用领域制定。从该方法获得的结果表明与从有限温度微磁学计算得到的结果非常吻合。该方法用于研究有限温度M H环路的速率依赖性以及垂直记录介质中记录的位模式的热降解。该程序的一个显着优势是它能够在时间间隔上扩展仿真能力，这比使用标准有限温度微磁体以相对适度的计算工作量实现的数量级大了多个数量级。

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  • 来源
    《Physical review》 |2013年第6期|064405.1-064405.10|共10页
  • 作者

    T. J. Fal; J. I. Mercer; M. D. Leblanc; J. P. Whitehead; M. L. Plumer; J. van Ek;

  • 作者单位

    Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John's, NL, Canada, A1B 3X7;

    Department of Computer Science, Memorial University of Newfoundland, St. John's, NL, Canada, A1B 3X7;

    Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John's, NL, Canada, A1B 3X7;

    Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John's, NL, Canada, A1B 3X7;

    Department of Physics and Physical Oceanography, Memorial University of Newfoundland, St. John's, NL, Canada, A1B 3X7;

    Western Digital Corporation, San Jose, California 94588, USA;

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  • 正文语种 eng
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  • 关键词

    magnetic recording materials; numerical simulation studies;

    机译：磁记录材料;数值模拟研究;

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