微带线宽带铁磁共振中双层导电铁磁薄膜微波吸收的强不对称性
Strong asymmetry of microwave absorption by bi-layer conducting ferromagnetic films in the microstrip-line based broadband ferromagnetic resonance
摘要：
本文从理论上研究了纳米厚度导电磁性双层膜在微带微波换能器激励下的铁磁共振响应特性。响应的强不对称性已经被发现。取决于层相对于换能器的阶数，第一高阶自旋驻波模式或基模显示出最大的响应。膜导电性和降低的对称性的微波场的这种换能器是负责这种行为。哪种模式的振幅较大还取决于驱动频率。这种效果被解释为屏蔽的不对称换能器领域的涡流在电影中。这种屏蔽对于厚度远低于微波趋肤深度的膜仍然非常有效。这种效应对于研究埋藏的磁性界面可能很有用，并且应该在宽带感应铁磁共振方法的未来发展中考虑到。
英文摘要：
Peculiarities of ferromagnetic resonance response of conducting magnetic bi-layer films of nanometric thicknesses excited by microstrip microwave transducers have been studied theoretically. Strong asymmetry of the response has been found. Depending on the order of layers with respect to the transducer either the first higher-order standing spin wave mode, or the fundamental mode shows the largest response. Film conductivity and lowered symmetry of microwave fields of such transducers are responsible for this behavior. Amplitude of which mode is larger also depends on the driving frequency. This effect is explained as shielding of the asymmetric transducer field by eddy currents in the films. This shielding remains very efficient for films with thicknesses well below the microwave skin depth. This effect may be useful for studying buried magnetic interfaces and should be accounted for in future development of broadband inductive ferromagnetic resonance methods.
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