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Element-specific ferromagnetic resonance in epitaxial Heusler spin valve systems

Time-resolved x-ray magnetic circular dichroism was used to investigate epitaxial MgO(100)/Co 2 Cr 0.6 Fe 0.4 Al and MgO(100)/Co 2 Cr 0.6 Fe 0.4 Al/Cr/CoFe films. The precessional motion of the individual sublattice magnetization, excited by continuous microwave excitation in the range 2–10 GHz, was...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2011-10, Vol.44 (42), p.425004-1-6
Main Authors: Klaer, P, Hoffmann, F, Woltersdorf, G, Jorge, E Arbelo, Jourdan, M, Back, C H, Elmers, H J
Format: Article
Language:English
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Summary:Time-resolved x-ray magnetic circular dichroism was used to investigate epitaxial MgO(100)/Co 2 Cr 0.6 Fe 0.4 Al and MgO(100)/Co 2 Cr 0.6 Fe 0.4 Al/Cr/CoFe films. The precessional motion of the individual sublattice magnetization, excited by continuous microwave excitation in the range 2–10 GHz, was detected by tuning the x-ray photon energy to the L 3 absorption edges of Cr, Fe and Co. The relative phase angle of the sublattice magnetization's response is smaller than the detection limit of 2°. A weakly antiferromagnetically coupled CoFe layer causes an increase in the ferromagnetic resonance linewidth consisting of a constant offset and a component linearly increasing with frequency that we partly attribute to non-local damping due to spin pumping.
ISSN:0022-3727
1361-6463
DOI:10.1088/0022-3727/44/42/425004