CoFeB/Cu/Py双涡旋振荡器中应变诱导的频率牵引
Strain-induced frequency pulling in CoFeB/Cu/Py double-vortex oscillators
AI总结：
本研究在CoFeB/Cu/Py堆叠双涡旋结构中观测到应变诱导的频率牵引效应，揭示了间隔层厚度对耦合涡旋频率偏移的调控规律，为自旋电子振荡器的动力学与同步调控提供了新的应变自由度。
摘要：
我们展示了通过非磁性间隔层静磁耦合的堆叠双涡旋结构中由压电应变诱导的频率牵引现象。我们研究了Cu间隔层厚度对由磁致伸缩CoFeB层和非磁致伸缩Py层构成的双涡旋结构中应变诱导的回旋频率偏移的影响。对于两个具有不同本征频率的堆叠涡旋，应变诱导的磁弹性各向异性会导致磁致伸缩涡旋的回旋频率下移。我们表明，当层间偶极耦合增强（即间隔层厚度减小）时，会出现应变诱导的频率牵引区域，此时非磁致伸缩Py涡旋的共振频率会上移，向磁致伸缩CoFeB涡旋的回旋共振频率靠近。该结果为自旋电子振荡器的动力学状态和同步条件调控提供了额外的自由度，这类振荡器可由电压控制且能通过应变调谐。
英文摘要：
We demonstrate piezostrain-induced frequency pulling in stacked double-vortex structures, magnetostatically coupled through the nonmagnetic spacer. We study the effect of the Cu spacer thickness on the strain-induced gyrotropic frequency shift in double-vortex structures comprising of magnetostrictive CoFeB and nonmagnetostricitve Py layers. For the two stacked vortices with different eigen-frequencies, the strain-induced magnetoelastic anisotropy leads to the downshift of the gyration frequency of the magnetostricitve vortex. We show that for increased dipolar coupling between the layers (i.e. decreased spacer thickness), a strain-induced frequency pulling regime is obtained, where the resonance frequency of the nonmagnetostrictive Py vortex is upshifted towards the gyration resonance of the magnetostrictive CoFeB vortex. This result offers an additional degree of freedom for the manipulation of the dynamical regimes and synchronization conditions in spintronic oscillators, controlled by voltage and tunable by strain
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