论文标题
Ferrimagnet GD $ _3 $ fe $ _5 $ o $ $ _ {12} $中阻尼参数的温度依赖性
Temperature dependence of the damping parameter in the ferrimagnet Gd$_3$Fe$_5$O$_{12}$
论文作者
论文摘要
众所周知，根据Ferrimagnets定义的Ferrimagnets中的阻尼参数$α_ {\ text {fm}} $，已知Ferromagnets的常规实践定义为强度取决于温度，并且在角动量补偿温度下，净角动量消失了。然而，铁磁金属的最新理论和实验发展表明，可以以这种方式定义阻尼参数，我们用$α_ {\ text {fim}} $表示，它没有在角度薪酬点上没有散开的异常，并且很少取决于温度。为了进一步了解铁磁体中阻尼参数的温度依赖性，我们通过使用阻尼参数的两个不同定义来分析文献中的几个数据集，用于铁磁性绝缘体Gadolinium Iron Garnet。使用两种方法来估计单个sublattice磁化，从而彼此一致，我们发现，在所有使用的数据集中，阻尼参数$α_ {\ text {f text {fim}} $在角度补偿温度下没有增加，而没有表现为无异常的温度，而常规定义的$α_ {fm teften} $ {fm {fm {fm {
The damping parameter $α_{\text{FM}}$ in ferrimagnets defined according to the conventional practice for ferromagnets is known to be strongly temperature dependent and diverge at the angular momentum compensation temperature, where the net angular momentum vanishes. However, recent theoretical and experimental developments on ferrimagnetic metals suggest that the damping parameter can be defined in such a way, which we denote by $α_{\text{FiM}}$, that it is free of the diverging anomaly at the angular momentum compensation point and is little dependent on temperature. To further understand the temperature dependence of the damping parameter in ferrimagnets, we analyze several data sets from literature for a ferrimagnetic insulator, gadolinium iron garnet, by using the two different definitions of the damping parameter. Using two methods to estimate the individual sublattice magnetizations, which yield results consistent with each other, we found that in all the used data sets, the damping parameter $α_{\text{FiM}}$ does not increase at the angular compensation temperature and shows no anomaly whereas the conventionally defined $α_{\text{FM}}$ is strongly dependent on the temperature.
