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Element-resolved x-ray ferrimagnetic and ferromagnetic resonance spectroscopy

AuthorsBoero, G.; Mouaziz, S.; Rusponi, S.; Bencok, Peter; Nolting, F.; Stepanow, Sebastian; Gambardella, Pietro
Issue Date17-Jan-2008
PublisherInstitute of Physics Publishing
Deutsche Physikalische Gesellschaft
CitationNew Journal of Physics 10: 01301 (2008)
AbstractWe report on the measurement of element-specific magnetic resonance spectra at gigahertz frequencies using x-ray magnetic circular dichroism (XMCD). We investigate the ferrimagnetic precession of Gd and Fe ions in Gd-substituted yttrium iron garnet, showing that the resonant field and linewidth of Gd precisely coincide with Fe up to the nonlinear regime of parametric excitations. The opposite sign of the Gd x-ray magnetic resonance signal with respect to Fe is consistent with dynamic antiferromagnetic alignment of the two ionic species. Further, we investigate a bilayer metal film, Ni(80)Fe(20)(5 nm)/Ni(50 nm), where the coupled resonance modes of Ni and Ni(80)Fe(20) are separately resolved, revealing shifts in the resonance fields of individual layers but no mutual driving effects. Energy-dependent dynamic XMCD measurements are introduced, combining x-ray absorption and magnetic resonance spectroscopies.
Description16 pages, 8 figures.-- ArXiv pre-print available at: http://arxiv.org/abs/0704.3139
Publisher version (URL)http://dx.doi.org/10.1088/1367-2630/10/1/013011
Appears in Collections:(CIN2) Artículos
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