Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, Warsaw, 00662, Poland.
Institute of Physics, Polish Academy of Sciences, Warsaw, 02668, Poland.
Sci Rep. 2017 Jul 18;7(1):5750. doi: 10.1038/s41598-017-05827-7.
Resonance in a ferromagnetic sphere, known in the body of literature as the mode of uniform precession, has recently been proven to be magnetic plasmon resonance (MPR). This finding has prompted research which is presented in this paper on the relation between the Q-factor at the MPR and the ferromagnetic resonance (FMR) linewidth ΔH, which is a parameter of magnetized gyromagnetic materials. It is proven in this paper that ΔH can be unequivocally determined from the Q-factor measured at the MPR, if all losses in the resonance system are properly accounted for. It can be undertaken through a rigorous but simple electrodynamic study involving the transcendental equation, as proposed in this paper. The present study also reveals that electric losses have a substantially reduced impact on ΔH due to the large magnetic to electric energy storage ratio at the MPR. Theoretical results are supported by measurements of the Q-factors on a monocrystalline yttrium iron garnet (YIG) sphere.
铁磁共振球中的共振，在文献中被称为均匀进动模式，最近已被证明是磁等离子体共振（MPR）。这一发现促使本文对 MPR 的 Q 因子与磁化旋磁材料的参数铁磁共振（FMR）线宽ΔH 之间的关系进行了研究。本文证明，如果适当考虑共振系统中的所有损耗，则可以从 MPR 处测量的 Q 因子中明确确定 ΔH。可以通过本文提出的涉及超越方程的严格但简单的电动力学研究来实现。本研究还表明，由于 MPR 处的磁能与电能存储比很大，电损耗对ΔH 的影响大大降低。理论结果得到了单晶钇铁石榴石（YIG）球的 Q 因子测量的支持。
