Phys. Rev. Lett. 67, 3172–3175 (1991)Fluctuation mechanism for biquadratic exchange coupling in magnetic multilayersReceived 22 August 1991; published in the issue dated 25 November 1991 We show how spatial fluctuations of chromium thickness amounting to one atomic monolayer account phenomenologically for the biquadratic magnetic coupling recently reported in epitaxial Fe/Cr/Fe trilayers. Corresponding fluctuations of the short-period oscillatory term of conventional exchange coupling induce static waves of magnetization whose energy has the observed biquadratic form. An existing calculation of conventional exchange and its recent direct measurements in highly ordered trilayers support our interpretation. © 1991 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.67.3172
DOI:
10.1103/PhysRevLett.67.3172
PACS:
75.50.Rr, 75.70.Cn
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