Temperature effects on time-dependent magnetic phenomena in recording media
Temperature effects on time-dependent magnetic phenomena in recording media
复制标题
温度对记录介质中随时间变化的磁现象的影响
DOI：
10.1016/0304-8853(95)00666-4
复制
发表时间：
1996
期刊：
影响因子：
--
通讯作者：
A. Cecchetti
中科院分区：
文献类型：
--
作者：
G. Bottoni;D. Candolfo;A. Cecchetti
研究了不同温度下时间对磁记录介质中颗粒磁化强度的影响。几乎所有被分析材料的磁化强度衰减率、磁黏度和涨落磁场都随着温度的降低而减小，这与低温下磁化的热稳定性的增加是一致的。活化体积随温度的变化遵循两种相反的行为。在未掺杂的材料中，激活体积随温度的降低而增大，而在相应的掺杂颗粒和金属颗粒中，激活体积随温度的升高而减小。根据这两类粒子中磁化转换的不同机制及其随温度的演化，解释了这种不同的行为。
The effects of time on the magnetization of particles used in magnetic recording media have been studied at different temperatures. The magnetization decay, the magnetic viscosity and the fluctuation field decrease with decreasing temperature in practically all the analyzed materials, coherently with the increase of thermal stability of the magnetization at lower temperatures. The activation volume evolves with temperature following two opposite behaviours. In undoped materials it increases when T decreases, while in the corresponding doped particles and in metal particles the activation volume decreases with temperature. Such diversified behaviours are interpreted on the basis of the different mechanisms of magnetization switching in the two classes of particles and of their evolution with temperature.