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Abstract
Polarized-neutron reflectivity together with magnetization and magnetotransport measurements on a (001)-oriented [Fe(14 \AA{})/Cr(74 \AA{})${]}_{20}$ superlattice confirms the existence of 90\ifmmode^\circ\else\textdegree\fi{} alignment of adjacent Fe layers due to biquadratic interlayer coupling. Each Fe layer is in a single domain state and the magnetic structure is coherent throughout the layered stack. The biquadratic coupling, however, is suppressed below the Cr N\'eel temperature (${\mathit{T}}_{\mathit{N}}$=187 K) as the Fe layers uncouple. But by field cooling through ${\mathit{T}}_{\mathit{N}}$ it is possible to retain a metastable biquadratic arrangement. \textcopyright{} 1996 The American Physical Society.
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