Date of this Version
PHYSICAL REVIEW B VOLUME 53, NUMBER 5 FEBRUARY 1996
Polarized-neutron reflectivity together with magnetization and magnetotransport measurements on a (001)-oriented [Fe(14 Å)/Cr(74 Å)]20 superlattice confirms the existence of 90° 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 Néel temperature (TN=187 K) as the Fe layers uncouple. But by field cooling through TN it is possible to retain a metastable biquadratic arrangement.