Cambel V, Karapetrov G
Institute of Electrical Engineering, SAS, Dubravska Cesta 9, 84104 Bratislava, Slovakia.
J Nanosci Nanotechnol. 2012 Sep;12(9):7422-5. doi: 10.1166/jnn.2012.6539.
In this work we study magnetic properties of nanomagnets with lateral dimensions 50-100 nm. These structures have a potential of producing static memories with high storage densities. If simple disk is used as basic nanomagnet, its chirality and polarity cannot be read/write easily by in-plane magnetic field. Based on micromagnetic calculations, we have designed "Pac-man-like" (PL) nanomagnet and calculated its magnetic properties using the oommf code. It solves the micromagnetic problem using the Landau-Lifshitz-Gilbert equation. The calculations have shown, that in the PL shape both, the chirality and the polarity, can be controlled by the in-plane magnetic field with x, y components. The PL shape opens straight channel for the energy relaxation towards stable vortex state with defined chirality and polarity for thickness 32-48 nm, and diameter 50-78 nm.
在这项工作中，我们研究了横向尺寸为50 - 100纳米的纳米磁体的磁性。这些结构具有产生高存储密度静态存储器的潜力。如果使用简单的圆盘作为基本纳米磁体，其手性和极性不容易通过面内磁场进行读/写。基于微磁学计算，我们设计了“吃豆人状”（PL）纳米磁体，并使用oommf代码计算了其磁性。它使用朗道 - 里夫希茨 - 吉尔伯特方程解决微磁学问题。计算结果表明，在PL形状中，手性和极性都可以通过具有x、y分量的面内磁场来控制。对于厚度为32 - 48纳米、直径为50 - 78纳米的情况，PL形状为能量弛豫向具有确定手性和极性的稳定涡旋态打开了直通道。
