纳米柱中耦合涡旋态坡莫合金层的宽带探测磁化动力学
Broadband probing magnetization dynamics of the coupled vortex state permalloy layers in nanopillars
摘要：
研究了面内磁场和层间距对层状纳米柱中耦合涡旋态磁点的宽带磁化响应的影响。对于直径为600 nm的偶极耦合圆形Py（25 nm）/Cu（20 nm）/Py（25 nm）纳米柱，小的面内场分裂方位角自旋波模式的本征频率，从而诱导低位耦合自旋波模式的同相和异相种类之间的突变。这种分裂的临界场由层中涡旋的反平行手征决定。在交换耦合的Py（25 nm）/Cu（1 nm）/Py（25 nm）三层纳米柱中也发生类似的（尽管更渐进的）变化。这些发现与微磁动态模拟定性一致。
英文摘要：
Broadband magnetization response of coupled vortex state magnetic dots in layered nanopillars was explored as a function of in-plane magnetic field and interlayer separation. For dipolarly coupled circular Py(25 nm)/Cu(20 nm)/Py(25 nm) nanopillars of 600 nm diameter, a small in-plane field splits the eigenfrequencies of azimuthal spin wave modes inducing an abrupt transition between in-phase and out-of-phase kinds of the low-lying coupled spin wave modes. The critical field for this splitting is determined by antiparallel chiralities of the vortices in the layers. Qualitatively similar (although more gradual) changes occur also in the exchange coupled Py(25 nm)/Cu(1 nm)/Py(25 nm) tri-layer nanopillars. These findings are in qualitative agreement with micromagnetic dynamic simulations.
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