微波光电压测量铁磁微带中的量子自旋激发
Quantized spin excitations in a ferromagnetic microstrip from microwave photovoltage measurements
摘要:
利用微波光电压技术测量了单个铁磁微带线中的量子化自旋激发。由于偶极-偶极相互作用和交换作用的不同贡献,观察到了几种自旋波模。其中有一系列不同的偶极交换自旋波模式,这使我们能够精确地确定微妙的自旋边界条件。从而建立了有限尺寸铁磁体中量子化自旋激发的一个完整图象。量子化自旋波模的色散具有由饱和磁化强度分开的两个不同的分支。
英文摘要:
Quantized spin excitations in a single ferromagnetic microstrip have been measured using the microwave photovoltage technique. Several kinds of spin wave modes due to different contributions of the dipole-dipole and the exchange interactions are observed. Among them are a series of distinct dipole-exchange spin wave modes, which allow us to determine precisely the subtle spin boundary condition. A comprehensive picture for quantized spin excitations in a ferromagnet with finite size is thereby established. The dispersions of the quantized spin wave modes have two different branches separated by the saturation magnetization.
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