Magnetization reversal mechanisms and time-dependent processes in thin Tb/Fe multilayer films
Magnetization reversal mechanisms and time-dependent processes in thin Tb/Fe multilayer films
复制标题
Tb/Fe 多层薄膜中的磁化反转机制和时间相关过程
DOI：
10.1088/0022-3727/30/11/006
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发表时间：
1997
期刊：
影响因子：
--
通讯作者：
G. Bayreuther
中科院分区：
文献类型：
--
作者：
T. Thomson;K. O’Grady;G. Bayreuther
在本文中，我们将相关论文中开发的磁化测量解释应用于磁光记录应用的 Tb/Fe 多层膜。我们的结果表明，剩磁曲线和 delta-I 图能够确定 Tb/Fe 多层膜中磁化反转的控制机制。在具有最大 Tb 含量的多层中，对于具有超过 6 个双层的薄膜，该磁畴成核控制的磁化反转让位于磁畴壁钉扎控制的反转。在中间 Tb 含量的多层膜中，畴壁钉扎仅在 20 个双层后才变得重要，而对于最低 Tb 含量的薄膜反转在整个系列中仍保持畴成核控制。磁化强度随时间的变化形式与磁化强度反转过程有关。所有表现出由畴成核主导的磁化反转的薄膜也表现出非线性 ln(t) 时间依赖性，而表现出畴壁钉扎反转的薄膜则表现出线性 ln(t) 时间依赖性。对于由域成核过程控制的所有薄膜，激活体积作为施加场的函数的形式是相同的。
In this paper we apply the interpretation of magnetization measurements developed in an associated paper to Tb/Fe multilayers for magneto-optic recording applications. Our results show that remanence curves and delta-I plots are able to determine the controlling mechanism for magnetization reversal in Tb/Fe multilayers. In the multilayer with the greatest Tb content this domain nucleation controlled magnetization reversal gave way to domain wall pinning controlled reversal for films with more than 6 bilayers. In the intermediate Tb content multilayers, domain wall pinning became important only after 20 bilayers, whereas for the lowest Tb content film reversal remained domain nucleation controlled throughout the series. The form of the time dependence of magnetization is connected to the magnetization reversal process. All the films that showed magnetization reversal dominated by domain nucleation also exhibited a nonlinear ln(t) time dependence whereas films showing domain wall pinning reversal exhibited a linear ln(t) time dependence. The form of the activation volume as a function of applied field is the same for all the films controlled by domain nucleation processes.