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Physical Review B (Condensed Matter and Materials Physics)
Print Issue of 1 February 2002

Phys. Rev. B 65, 064440 (2002) (7 pages)

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Magnetic interlayer exchange coupling in epitaxial Fe/Si/Fe(001) studied by polarized neutron reflectometry

R. W. E. van de Kruijs, M. Th. Rekveldt, and H. Fredrikze
Interfaculty Reactor Institute, Delft University of Technology, Department of Neutron scattering and Mössbauer spectroscopy, Mekelweg 15, 2629 JB Delft, The Netherlands
J. T. Kohlhepp, J. K. Ha, and W. J. M. de Jonge
Eindhoven University of Technology, Department of Applied Physics and COBRA Research Institute, P.O. BOX 513, 5600MB Eindhoven, The Netherlands

(Received 10 August 2001; published 24 January 2002)

Polarized neutron reflectometry (PNR) has been used to investigate the magnetic interlayer coupling in a MBE-grown Fe/Si/Fe(001) sandwich at room temperature and at 10 K. Both the magnitude and orientation of the magnetic moments of the Fe layers are obtained from a rigorous analysis of the PNR data. Orthogonal configurations of the Fe magnetizations were observed, providing unambiguous evidence for the presence of a biquadratic term in the exchange coupling energy. The competition between the bilinear and biquadratic exchange couplings results in distinct orthogonal and antiparallel configurations of the Fe magnetizations at room temperature. A previously unresolved magnetic configuration in the room-temperature hysteresis curve was identified by the PNR measurements as a 180° spin-flop transition. The dominant role of the biquadratic coupling at low temperatures is evident from the orthogonal configuration of the magnetizations at remanence in the measurements at T = 10 K. The magnetic configurations deduced by PNR are in good agreement with those obtained by fitting the magnetic hysteresis loops using a global energy minimum calculation. ©2002 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v65/e064440
doi:10.1103/PhysRevB.65.064440
PACS: 75.25.+z, 61.12.Ha, 75.60.-d, 75.70.-i        Additional Information

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Citing Articles

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  1. Spin Flop Transition in a Finite Antiferromagnetic Superlattice: Evolution of the Magnetic Structure
    S. G. E. te Velthuis et al., Phys. Rev. Lett. 89, 127203 (2002)
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