Effects of vortex chirality and shape anisotropy on magnetization reversal of Co nanorings (invited)
Effects of vortex chirality and shape anisotropy on magnetization reversal of Co nanorings (invited)
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DOI：
10.1063/1.3358233
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发表时间：
2010-05-01
影响因子：
3.2
通讯作者：
McCartney, Martha R.
中科院分区：
文献类型：
--
作者：
He, Kai;Smith, David J.;McCartney, Martha R.
用离轴电子全息术和微磁模拟研究了旋涡手性和形状各向异性对带槽和不带槽的Co纳米环磁化反转的影响。在不同形状的元素的反转过程中，确定了阶跃磁滞回线，并确定了典型的清晰状态，包括洋葱态、涡旋态、通量闭合(FC)态和欧米伽(Omega)态。洋葱态形成的旋涡(旋涡)的手性决定了开关机制。Co纳米环和垂直于缝隙的开槽环通过洋葱-FC-洋葱模式进行了多步跃迁，也涉及涡旋(涡)的形成和湮灭，而垂直于缝隙的开槽环通过FC态的突然手性反转表现出简单的一步开关。从退磁能的角度讨论了形状各向异性对开关场的影响。(C)2010年美国物理研究所。[DOI：10.1063/1.3358233]
The effects of vortex chirality and shape anisotropy on the magnetization reversal of thin Co nanorings with and without slots have been investigated using off-axis electron holography and micromagnetic simulations. Stepped hysteresis loops were determined and typical well-defined states, including onion states, vortex states, flux-closure (FC) states, and omega (Omega) states were identified during reversal for different element shapes. The chirality of the vortex (vortices) formed after the onion states determined the switching mechanism. The Co nanorings and slotted rings with applied field parallel to the slots showed multistep switching via onion-FC-onion mode, also involving the formation and annihilation of vortex (vortices), whereas slotted rings with applied field perpendicular to the slots exhibited simple one-step switching by abrupt chirality reversal of the FC states. The influence of shape anisotropy on switching fields is also discussed in terms of demagnetization energy. (C) 2010 American Institute of Physics. [doi: 10.1063/1.3358233]