The N\'eel temperature ( TN) 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 tCr of 42 {}. The bulk value of TN is approached asymptotically as tCr 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 TN. These results are attributed to finite-size effects and spin frustration near rough Fe-Cr interfaces.
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Fullerton et al. (1995) studied this question.
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