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Thermally assisted switching in FePt single-domain particles with a Gaussian distribution of temperature 被引量:1

Thermally assisted switching in FePt single-domain particles with a Gaussian distribution of temperature
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摘要 Magnetic nanoscale systems,including nanodots,nanofibers,nanowires and nanoparticles,are currently attracting great interest due to their interesting physical and promising applications in various fields,such as magnetic recording,sensors,target drugs and catalysts,as well as others.To achieve ultrahigh recording density,the method of heat assisted magnetic recording(HAMR) has been introduced.In this work,with the help of a Monte Carlo method,the mechanisms of thermally assisted magnetization switching in FePt single-domain particles driven by an external magnetic field are investigated,where the temperature in the particles is assumed to follow a Gaussian distribution.Two nucleation modes are observed for different distributions of temperature.One is initiated by many droplets,which join each other at the boundary of the system;the other is ini-tiated by many droplets at the boundary,but in growth tending toward the inner part of the system.An inverse proportional relationship between the metastable lifetime and the distribution is also found. Magnetic nanoscale systems, including nanodots, nanofibers, nanowires and nanoparticles, are currently attracting great inter- est due to their interesting physical and promising applications in various fields, such as magnetic recording, sensors, target drugs and catalysts, as well as others. To achieve ultrahigh recording density, the method of heat assisted magnetic recording (HAMR) has been introduced. In this work, with the help of a Monte Carlo method, the mechanisms of thermally assisted magnetization switching in FePt single-domain particles driven by an external magnetic field are investigated, where the tem- perature in the particles is assumed to follow a Gaussian distribution. Two nucleation modes are observed for different distri- butions of temperature. One is initiated by many droplets, which join each other at the boundary of the system; the other is ini- tiated by many droplets at the boundary, but in growth tending toward the inner part of the system. An inverse proportional re- lationship between the metastable lifetime and the distribution is also found.
出处 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第7期1263-1266,共4页 中国科学:物理学、力学、天文学(英文版)
基金 support by the Fund for Talents Introduction of Chongqing University of Arts and Sciences (Grant No. Z2011RCYJ03)
关键词 magnetization switching Monte Carlo simulation NUCLEATION Gaussian distribution 纳米粒子 温度分布 高斯分布 FePt 辅助开关 单畴 纳米系统 蒙特卡洛方法
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