The Neel temperature (Tz) of Cr in sputtered, epitaxial Fe/Cr(001) superlattices is identified via transport and magnetic anomalies.The onset of the antiferromagnetism is at a thickness tc, of 42 A. The bulk value of Tz is approached asymptotically as tc, increases and is characterized by a three-dimensional shift exponent. Most strikingly, the biquadratic interlayer magnetic coupling (90 orientation of adjacent Fe layers), observed in the thick Cr regime, is suppressed below T~These. results are attributed to finite-size effects and spin frustration near rough Fe-Cr interfaces.PACS numbers: 75.70.Fr, 73.50.Jt, 75.30.Kz, 75.50.Rr Fe/Cr superlattices exhibit a variety of intriguing magnetic properties, including oscillatory interlayer coupling

Magnetotransport in magnetic epitaxial metal layers buried in (Ga,Al)As heterostructures (invited) (abstract)

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