Chirality control of ferromagnetic ring memoery by magnetostatic interaction

在纳米铁磁环结构中，存在两种特征磁态：洋葱态和涡旋态。特别是在涡旋状态下，磁矩沿环周排列，从而抑制了环边缘的杂散场。磁矩沿顺时针或逆时针方向排列，在高密度存储单元的应用中起着重要作用。我们提出了手性方向的电检测方法（涡旋状态下的顺时针方向和逆时针方向）。通过对环形结构施加不对称的面内磁场，可以通过检测磁阻变化来检测顺时针或逆时针方向。

In nanosized ferromagnetic ring structures, there are two characteristic magnetic states called Onion state and Vortex state. Especially, in Vortex state, magnetic moment aligns around the ring perimeter, resulting in the suppression of the stray field from the ring edge. Magnetic moment aligns either clockwise or counter clockwise directions and plays an important role for the application of high density memory cells.We proposed the electrical detection of chiral direction (clockwise and couter clockwise directions in the Vortex state). By applying the in-plane magnetic field to be asymmetric to the ring structure, we can detect either clockwise or counter clockwise direction by detecting the magneto-resistance change.