Suppression of biquadratic coupling in Fe/Cr(001) superlattices below the Néel transition of Cr

The Neel temperature ({ital T}{sub {ital N}}) 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 {ital t}{sub Cr} of 42 A. The bulk value of {ital T}{sub {ital N}} is approached asymptotical...

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Veröffentlicht in:Physical Review Letters 1995-07, Vol.75 (2), p.330-333
Hauptverfasser: Fullerton, EE, Riggs, KT, Sowers, CH, Bader, SD, Berger, A
Format: Artikel
Sprache:eng
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Zusammenfassung:The Neel temperature ({ital T}{sub {ital N}}) 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 {ital t}{sub Cr} of 42 A. The bulk value of {ital T}{sub {ital N}} is approached asymptotically as {ital t}{sub Cr} increases and is characterized by a three-dimensional shift exponent. Most strikingly, the biquadratic interlayer magnetic coupling (90{degree} orientation of adjacent Fe layers), observed in the thick Cr regime, is suppressed below {ital T}{sub {ital N}}. These results are attributed to finite-size effects and spin frustration near rough Fe-Cr interfaces.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.75.330