Higher order vortex gyrotropic modes in circular ferromagnetic nanodots.
Higher order vortex gyrotropic modes in circular ferromagnetic nanodots.
复制标题
DOI：
10.1038/srep04796
复制
发表时间：
2014-04-25
影响因子：
4.6
通讯作者：
Adeyeye AO
中科院分区：
文献类型：
--
作者：
Ding J;Kakazei GN;Liu X;Guslienko KY;Adeyeye AO
磁旋涡是几何约束亚微米软磁元件的基态，它由面内卷曲磁化构型和面外磁化的针状磁芯区组成。本文用宽带铁磁共振技术研究了较厚(50-100 nm)的Ni80Fe20圆点在外加磁场作用下的磁动力学。在吉赫兹频率范围内，实验探测到了与厚度相关的涡核回转动力学相关的自旋激发模。理论分析和微磁学模拟都表明，这些交换主导模是n=0，1，2节点涡核弦沿网点厚度的弯曲振荡。当n=1时，模的强度明显地依赖于点的厚度和直径，并且在某些情况下比当n=0时的均匀模的强度更大。这为自旋转移扭矩振荡器领域开辟了广阔的前景。
Magnetic vortex that consists of an in-plane curling magnetization configuration and a needle-like core region with out-of-plane magnetization is known to be the ground state of geometrically confined submicron soft magnetic elements. Here magnetodynamics of relatively thick (50–100 nm) circular Ni80Fe20 dots were probed by broadband ferromagnetic resonance in the absence of external magnetic field. Spin excitation modes related to the thickness dependent vortex core gyrotropic dynamics were detected experimentally in the gigahertz frequency range. Both analytical theory and micromagnetic simulations revealed that these exchange dominated modes are flexure oscillations of the vortex core string with n = 0,1,2 nodes along the dot thickness. The intensity of the mode with n = 1 depends significantly on both dot thickness and diameter and in some cases is higher than the one of the uniform mode with n = 0. This opens promising perspectives in the area of spin transfer torque oscillators.
登录
查看更多内容
影响因子：
8.6
作者：
Cowburn, RP;Adeyeye, AO;Welland, ME
通讯作者：
Welland, ME
影响因子：
56.9
作者：
Shinjo, T;Okuno, T;Ono, T
通讯作者：
Ono, T
影响因子：
8.6
作者：
Mistral, Q.;van Kampen, M.;Schrefl, T.
通讯作者：
Schrefl, T.
影响因子：
16.6
作者：
Rondin, L.;Tetienne, J-P.;Jacques, V.
通讯作者：
Jacques, V.
影响因子：
3.7
作者：
Boust, F;Vukadinovic, N
通讯作者：
Vukadinovic, N