Control of ultranarrow Co magnetic domain wall widths in artificially patterned H-bar structures
Control of ultranarrow Co magnetic domain wall widths in artificially patterned H-bar structures
复制标题
DOI：
10.1063/1.3082046
复制
发表时间：
2009-02
影响因子：
4
通讯作者：
Zhenghai Yang;Li Sun;Xiao-Liu Zhang;M. Cao;X. Deng;A. Hu;H. Ding
中科院分区：
文献类型：
--
作者：
Zhenghai Yang;Li Sun;Xiao-Liu Zhang;M. Cao;X. Deng;A. Hu;H. Ding
研究了连接两个相对磁化的“H”形图案平行支腿的纳米横杆上Co磁畴壁的微磁学模拟。根据初始构型的不同，横杆域壁可以在H型平面内扭曲、平面外扭曲或漩涡，分别形成Neel、Bloch或涡旋结构。能量相图表明，Neel壁是能量上最有利的，其次是Bloch壁，它变得不稳定，并随着交叉杆尺寸的增加而变化为涡旋状。最有趣的是，尼尔墙的宽度可以根据横杆尺寸的不同而缩小或扩大。在横杆长度和宽度都较小的情况下，可以获得理想的超轴向域壁。这些发现对基于纳米磁阻和磁阻效应的磁壁钉扎的自旋电子器件的设计有一定的参考价值。
Micromagnetic simulations of Co domain walls on nanometer crossbars that join two oppositely magnetized parallel legs of “H” shaped patterns are studied. The crossbar domain walls can twist in the plane of the H-pattern, out of the plane, or swirl, forming Neel, Bloch, or vortex structures, respectively, depending on the initial configurations. An energy phase diagram as a function of the crossbar constriction yields the Neel wall as the energetically most favorable, followed by the Bloch wall, which becomes unstable and changes into a vortex-like wall with increasing crossbar size. Most interestingly, the Neel wall width can either shrink or expand depending on the crossbar dimensions. In the case that both the crossbar length and width are small, desirable, ultranarrow domain walls can be obtained. These findings are useful for spintronic device design based on domain wall pinning via nanonotch and domain-wall magnetoresistance approaches.