Weakly coupled motion of individual layers in ferromagnetic resonance
Weakly coupled motion of individual layers in ferromagnetic resonance
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DOI：
10.1103/physrevb.74.064409
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发表时间：
2006-08-01
影响因子：
3.7
通讯作者：
Bailey, W. E.
中科院分区：
文献类型：
--
作者：
Arena, D. A.;Vescovo, E.;Bailey, W. E.
我们对Ni81Fe19/Cu/Co93Zr7三层结构中的铁磁共振(FMR)进行了分层和时间分辨测量。发展了时间分辨X射线磁性圆二色谱，在2.3 GHz的铁磁共振频率下获得了谐振场激发。可以直接观察到小角度(至0.2度)的时间域磁化进动，并通过在Ni、Fe和Co边缘的元素对比度将其分解为单独的层。相位灵敏度允许直接测量单个元素和层的进动振荡中的相对相位滞后。在单层共振的相位和幅度响应中，发现了一种在常规FMR测量中难以确定的弱铁磁耦合。
We demonstrate a layer- and time-resolved measurement of ferromagnetic resonance (FMR) in a Ni81Fe19/Cu/Co93Zr7 trilayer structure. Time-resolved x-ray magnetic circular dichroism has been developed in transmission, with resonant field excitation at a FMR frequency of 2.3 GHz. Small-angle (to 0.2 degrees), time-domain magnetization precession could be observed directly, and resolved to individual layers through elemental contrast at Ni, Fe, and Co edges. The phase sensitivity allowed direct measurement of relative phase lags in the precessional oscillations of individual elements and layers. A weak ferromagnetic coupling, difficult to ascertain in conventional FMR measurements, is revealed in the phase and amplitude response of individual layers across resonance.