Regensburg 1998 – scientific programme
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DS: Dünne Schichten
DS 24: Postersitzung
DS 24.57: Poster
Thursday, March 26, 1998, 15:00–19:00, PF A
Interface Studies on Cr/Fe/Cr by Ferromagnetic Resonance and SQUID — •J. Pflaum1, J. Pelzl1, P. Bödeker1, H. Zabel1, M. Maryško2, P. Sturc2, and Z. Frait2 — 1Inst. für Experimentalphysik, Ruhr-Universität, 44780 Bochum, Germany — 2Institute of Physics, ASCR, CZ 18040, Praha 8, Czech Republic
The interface interaction between ferromagnetic Fe and antiferromagnetic
Cr is studied by ferromagnetic resonance (FMR) technique at microwave
frequencies of 9GHz to 69GHz and SQUID magnetometry. The MBE grown samples
consist of 20Å bcc Fe(001) deposited on a Cr layer of variable
thickness (30Å ≤ tCr≤ 12000Å). On the Fe a Cr cap-layer
of
a thickness of 20Å is grown to enable ex-situ analysis. Cooling
the
samples an increase of the coercive force as well as an anomalous behavior
of the parameters determining the FMR line can be observed. On the basis
of
the present results we show that this behavior is related to a
reorientation
transition of the Cr moments from a transversal polarized spin-density
wave
to a longitudinal polarized spin-density wave. The transition temperature
of
this first order phase transition clearly shows a dependency on the Cr
layer
thickness and is suppressed for tCr≤60Å. Deviation from a
3D-Heisenberg-model is observed and can be mainly related to the
occurrence
of magnetic domains in Cr as well as to a clamping of a commensurate phase
of
the Cr spins located at the Fe/Cr-interface.
This work is supported by the DFG and Volkswagen Stiftung.