Inertia-Free Thermally Driven Domain-Wall Motion in Antiferromagnets.
Inertia-Free Thermally Driven Domain-Wall Motion in Antiferromagnets.
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DOI：
10.1103/physrevlett.117.107201
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发表时间：
2016-08
影响因子：
8.6
通讯作者：
S. Selzer;U. Atxitia;U. Ritzmann;D. Hinzke;U. Nowak
中科院分区：
文献类型：
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作者：
S. Selzer;U. Atxitia;U. Ritzmann;D. Hinzke;U. Nowak
从理论上研究了热感磁自旋流触发的反铁磁体中的畴壁运动。基于经典自旋模型的数值计算表明，壁向较热的区域移动，就像铁磁体一样。然而，对于较大的驱动力，所谓的沃克崩溃（通常会加速沿墙的速度）就消失了。这是因为墙壁在运动过程中没有倾斜。出于同样的原因，反铁磁壁没有惯性，因此没有加速阶段导致更高的有效迁移率。
Domain-wall motion in antiferromagnets triggered by thermally induced magnonic spin currents is studied theoretically. It is shown by numerical calculations based on a classical spin model that the wall moves towards the hotter regions, as in ferromagnets. However, for larger driving forces the so-called Walker breakdown-which usually speeds down the wall-is missing. This is due to the fact that the wall is not tilted during its motion. For the same reason antiferromagnetic walls have no inertia and, hence, no acceleration phase leading to higher effective mobility.