Journal Article

PreJuSER-19945

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Nano and picosecond magnetization dynamics of weakly coupled CoFe/Cr/NiFe trilayers studied by a multitechnique approach

Kaiser, A. M.FZJ* ; Schoppner, C. ; Romer, F. M. ; Hassel, C. ; Wiemann, C.FZJ* ; Cramm, S.FZJ* ; Nickel, F.FZJ* ; Grychtol, P.FZJ* ; Tieg, C. ; Lindner, J. ; Schneider, C. M.FZJ*

2011
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/10878  doi:10.1103/PhysRevB.84.134406

Abstract: We present results on the magnetization dynamics in heterostructures of the CoFe/Cr/NiFe type. We have employed a combination of different layer-selective methods covering a broad range from quasistatic hysteresis measurements by x-ray magnetic circular dichroism (XMCD), over time-resolved photoemission electron microscopy (PEEM) at subnanosecond timescales to high-frequency ferromagnetic resonance (FMR) experiments. With increasing driving frequency, we found a different influence of the coupling between the two ferromagnetic layers on the dynamic behavior. Employing the spatial resolution of the PEEM method, we have been able to discern various dynamic responses in different regions of the sample that could be attributed to magnetodynamic processes with a different degree of coupling. In conjunction with the complementary FMR and XMCD measurements, we attribute the inhomogeneous influence of interlayer coupling to a shift from domain-wall-motion-dominated dynamics at low frequencies to precession-dominated dynamics at higher frequencies.

Keyword(s): J

Note: This work has been financially supported by the DFG (SFB 491) and the BMBF (05KS7UK1). The authors thank R. Schreiber for the expert sample preparation as well as K. Bickmann, J. Lauer, B. Kuepper, and H. Pfeiffer for technical support. Thanks are due to the ESRF and BESSY beamline staffs for the support during beamtimes.

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Contributing Institute(s):

1. Elektronische Eigenschaften (PGI-6)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)

Appears in the scientific report 2011

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