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Dipolar spin waves of lateral magnetic superlattices

机译：横向磁超晶格的偶极自旋波

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We investigate the high-frequency dynamics of dysprosium and cobalt gratings fabricated at the surface of a GaAs/Al_(0.33)Ga_(0.67)As heterojunction. We detect the collective and localized spin-wave modes of the grating by measuring the photovoltage and the photoresistance induced in the two-dimensional electron gas (2DEG). The magnetic excitations couple to the 2DEG through their stray magnetic field. We perform a spectroscopy of dipolar-exchange spin waves as a function of microwave power, temperature, the tilt angle of the applied magnetic field, and by varying the structural and material parameters to change the strength of dipolar interactions. The data reveal two types of spin waves. Dipolar magnetization waves propagate across the grating through the magnetostatic interaction between the stripes. We derive an analytical expression of their dispersion curve and obtain a good fit of the ferromagnetic resonance broadening from first principles. The second type is dipolar edge spin waves which manifest through a series of sharp resonances at lower magnetic field. These waves are confined near the pole surfaces and interact very little with neighboring stripes. We calculate the eigenfrequencies of the quantized modes and obtain a qualitative explanation of the low-field resonances. The fit yields a value of the exchange stiffness constant of dysprosium, A = 1.5 X 10~(-12)J m~(-1). Our experiments show that photovoltage measurements in hybrid semiconductor-ferromagnetic structures provide a sensitive and noninvasive tool for probing the spin waves of small magnets (10-500 nm).
机译：我们研究了在GaAs / Al_（0.33）Ga_（0.67）As异质结表面上制作的s和钴光栅的高频动力学。我们通过测量二维电子气（2DEG）中感应的光电压和光阻来检测光栅的集体和局部自旋波模式。磁激励通过其杂散磁场耦合到2DEG。我们根据微波功率，温度，所施加磁场的倾斜角以及通过改变结构和材料参数来改变偶极相互作用的强度，来执行偶极交换自旋波的光谱分析。数据揭示了两种类型的自旋波。偶极磁化波通过条纹之间的静磁相互作用在整个光栅上传播。我们推导了其色散曲线的解析表达式，并从第一原理中获得了扩展的铁磁共振的良好拟合。第二种是偶极子边自旋波，它在较低的磁场下通过一系列尖锐的共振表现出来。这些波被限制在极表面附近，并且与相邻条纹的相互作用很小。我们计算量化模式的本征频率，并获得低场共振的定性解释。拟合得出a的交换刚度常数，A = 1.5 X 10〜（-12）J m〜（-1）。我们的实验表明，混合半导体-铁磁结构中的光电压测量为探测小磁体（10-500 nm）的自旋波提供了一种灵敏且无创的工具。

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