窄隙铁磁纳米环的磁化状态和开关
Magnetization states and switching in narrow-gapped ferromagnetic nanorings
摘要：
我们研究坡莫合金纳米环，光刻制造的窄间隙，打破旋转对称的环，同时保留涡旋基态，使用微磁模拟和磁力显微镜（MFM）。这些结构中的涡旋手性可以容易地用平面内磁场设置，并且由于与间隙相关联的场而容易地由MFM探测，这表明这种环在存储技术中可能的应用。我们发现，有间隙的环边缘特性（即，边缘轮廓和间隙形状）在确定磁化转换场中是关键的，因此阐明了在控制可能包含这种结构的器件中的基本参数。
英文摘要：
We study permalloy nanorings that are lithographically fabricated with narrow gaps that break the rotational symmetry of the ring while retaining the vortex ground state, using both micromagnetic simulations and magnetic force microscopy (MFM). The vortex chirality in these structures can be readily set with an in-plane magnetic field and easily probed by MFM due to the field associated with the gap, suggesting such rings for possible applications in storage technologies. We find that the gapped ring edge characteristics (i.e., edge profile and gap shape) are critical in determining the magnetization switching field, thus elucidating an essential parameter in the controls of devices that might incorporate such structures.
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