论文标题
终生，崩溃和逃脱路径，用于散装磁铁的跳跃，并具有竞争交换相互作用
Lifetime, collapse and escape paths for hopfions in bulk magnets with competing exchange interactions
论文作者
论文摘要
具有竞争交换相互作用的离散晶格上的磁跳跃的寿命是在过渡状态理论的磁性自由度框架内计算的。考虑了与相同连续微磁模型相对应的三组离散模型参数。在系统的多维能量表面上发现了跳跃崩溃的最小能量路径。已经计算出崩溃过程的激活能。事实证明，当跳半径等于几个晶格常数时，激活能在三个考虑的参数值中显着不同，这表明晶格效应的重要性。随着崩溃的研究，研究了通过样品边界的跳跃逃逸过程。结果表明，此过程不需要激活能量。发现了跳跃的寿命，这表明它们只能在几个开kelvins的温度下存在，并且由于热波动而几乎无法产生。
The lifetimes of magnetic hopfions on a discrete lattice with competing exchange interactions are calculated within the framework of the transition state theory for magnetic degrees of freedom. Three sets of discrete model parameters corresponding to the same continuous micromagnetic model are considered. Minimal energy paths for hopfion collapses were found on the multidimensional energy surface of the system. The activation energies of the collapse processes have been calculated. It turned out that the activation energy differs significantly for the three considered values of the parameters, which indicates the importance of lattice effects, when the hopfion radius equals several lattice constants. Along with the collapse, the hopfion escape process through the sample boundary is studied. It is shown that this process does not require an activation energy. The lifetimes of hopfions are found and it is shown that they can exist only at temperatures of a few kelvins and practically cannot be generated due to thermal fluctuations.
