Phys. Rev. Lett. Phys. Rev. A Phys. Rev. B Phys. Rev. C Phys. Rev. D Phys. Rev. E Phys. Rev. ST AB Rev. Mod. Phys. Phys. Rev. (Series I) Phys. Rev. Volume: Page/Article:

Phys. Rev. B 55, 12428–12438 (1997)

[Issue 18 – 1 May 1997 ]

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Oscillatory biquadratic coupling in Fe/Cr/Fe(001)

A. J. R. Ives, J. A. C. Bland, R. J. Hicken, and C. Daboo

Cavendish Laboratory, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom

Polar Kerr measurements have been used to measure the dependence of the biquadratic coupling strength B₁₂ on Cr thickness in an Fe/Cr/Fe trilayer. The overall behavior, which consists of a maximum coupling strength at d_Cr=5 Å (3.5 ML) with a falloff at greater Cr thicknesses, is found to be consistent with in-plane Kerr and Brillouin light-scattering measurements performed on the same sample. The polar Kerr measurements suggest additionally that B₁₂ increases from zero near zero Cr thickness, and that it oscillates in magnitude after the first peak, with a second peak in B₁₂ occurring at about d_Cr=12 Å (8.3 ML). The positions and heights of the first and second biquadratic coupling maxima, in relation to the first bilinear coupling maximum, show excellent agreement with previous measurements by Köautbler et al. of the biquadratic coupling behavior in Fe/Cr/Fe, and also show good agreement with the predictions of an intrinsic biquadratic coupling mechanism due to Edwards et al.

©1997 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v55/p12428
DOI: 10.1103/PhysRevB.55.12428
PACS: 75.30.Et, 75.30.Gw, 75.70.Cn

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