硬磁畴稳定性与垂直布洛赫线间静磁相互作用的关系

研究石榴石磁泡膜在直流偏磁场作用下布洛赫线间的静磁作用对硬磁畴稳定性的影响.一方面实验研究了圆形硬磁畴的缩灭行为和条泡转变行为以及两种行为间的关系;另一方面通过引入相邻布洛赫线间的静磁作用能,改进了圆柱形硬磁畴的畴壁能公式,从而使一些多年来一直不能解释的硬磁畴在直流偏磁场下的行为得到了统一的解释,并在此基础上提出了估算硬磁畴畴壁中垂直布洛赫线数目的方法.最后还应用经该文改进了的畴壁能公式定性地解释了部分硬磁畴种类随温度而变化的现象.

Dependence of Stability of the Hard Domains on the Magnetostatic Interaction between VBLs

The influence of the magnetostatic interaction between vertical Bloch lines (VBLs) on the stability of hard domains in garnet bubble films subjected to a magnetostatic bias field is investigated. The collapse behaviour and the stripe to bubble transition behaviour of circular hard domains as well as the relationship between these two behaviour are studied experimentally. The domain wall energy formula of the circular hard doamins is improved by adding a magnetostatic interaction energy term between VBLs. Then, some experimental phemomena of hard domains subjected to a bias field, which have remained unclear for many years, are interpreted qulitatively. Based on these grounds, a method is proposed for estimating the number of VBLs in the walls of hard domains. Finally, the dependence of the hard domain kinds on temperature was interpreted qualitatively by using above improved theory.