Weakly Coupled Motion of Individual Layers in Ferromagnetic Resonance

Details Weakly Coupled Motion of Individual Layers in Ferromagnetic Resonance Weakly Coupled Motion of Individual Layers in Ferromagnetic Resonance

2006-04-27

arxiv.org/abs/cond-mat/0604635v1

Phys. Rev. B 74 (2006) 064409

Physics

Condensed Matter

Materials Science

22 pages, 6 figures submitted to Physical Review B

Scientific paper

10.1103/PhysRevB.74.064409

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 degree), 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 precession 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.

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