DIRECT OBSERVATION OF ANTIFERROMAGNETIC PHASE-TRANSITION IN FCC FE FILMS

Spin-polarized low-energy electron diffraction combined with in situ K err magnetometry and a model calculation indicates that a six monolaye r thick fee Fe film undergoes a reversible transition from a room-temp erature paramagnetic state to a low-temperature phase including antife rromagnetically coupled planes. The fee Fe film was grown in an exchan ge field provided by an underlying Co layer.