Podbielski J, Giesen F, Grundler D
Institut für Angewandte Physik und Mikrostrukturforschungszentrum, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg, Germany.
Phys Rev Lett. 2006 Apr 28;96(16):167207. doi: 10.1103/PhysRevLett.96.167207. Epub 2006 Apr 27.
We have studied the spin excitations of ferromagnetic rings and observed a distinct series of quantized modes in the vortex state. We attribute them to spin waves that circulate around the ring and interfere constructively. They form azimuthal eigenmodes of a magnetic ring resonator which we resolve up to the fourth order. The eigenfrequencies are calculated semianalytically and classified as a function of magnetic field by a quantization rule which takes into account a periodic boundary condition. Strikingly each mode exists only below a characteristic field.
我们研究了铁磁环的自旋激发，并在涡旋态中观测到一系列独特的量子化模式。我们将它们归因于环绕环传播并发生相长干涉的自旋波。它们形成了磁环谐振器的方位本征模，我们分辨出了高达四阶的本征模。本征频率通过半解析方法计算得出，并根据考虑了周期性边界条件的量子化规则作为磁场的函数进行分类。引人注目的是，每个模式仅存在于一个特征场以下。
