论文标题
宽度宽度可变的域壁中的局部自旋传输扭矩和磁倍率
Local spin transfer torque and magnetoresistance in domain walls with variable width
论文作者
论文摘要
多年来，使用自旋极化电流在铁磁纳米线中操纵磁性域壁一直是进行密集研究的主题。最近，由于技术进步，创建具有特殊特征的纳米接触越来越普遍。现在，我们对域墙中的磁倍率和自旋传输扭矩进行了完整的量子调查，该域壁嵌入了Ni $ _ {80} $ _ {80} $ fe $ _ {20} $的纳米接触中，其中域壁的大小成为相关的可调参数。可以详细分析对域壁宽度以及沿域壁扭矩的空间依赖性的依赖性。如预期的那样，磁极耐药性会随着域壁宽度的增加而下降，但也显示了特征性的调制和共振旋转式传输的点。自旋传输扭矩即使不考虑放松，也具有显着的面内和面外贡献。仔细检查确定了短域壁的旋转密度的未对准以及更长的域壁的有效量规场的贡献，这两者都沿域壁振荡。
Use of a spin polarized current for the manipulation of magnetic domain walls in ferromagnetic nanowires has been the subject of intensive research for many years. Recently, due to technological advancements, creating nano-contacts with special characteristics is becoming more and more prevalent. We now present a full quantum investigation of the magnetoresistance and the spin transfer torque in a domain wall, which is embedded in a nano-contact of Ni$_{80}$Fe$_ {20}$, where the size of the domain wall becomes a relevant tunable parameter. The dependence on the domain wall width as well as the spatial dependence of the torque along the domain wall can be analyzed in complete detail. The magnetoresistance drops with increasing domain wall width as expected, but also shows characteristic modulations and points of resonant spin-flip transmission. The spin transfer torque has both significant in-plane and out-of-plane contributions even without considering relaxation. A closer inspection identifies contributions from the misalignment of the spin density for short domain walls as well as an effective gauge field for longer domain walls, both of which oscillate along the domain wall.
