Enhancement of Spin Correlation in Cr2O3 Film Above Néel Temperature Induced by Forming a Junction With Fe2O3 Layer: First-Principles and Monte-Carlo Study

We propose an approach to enhance the antiferromagnetic spin correlation in the Cr
₂
O
₃
film by forming a junction with the Fe
₂
O
₃
layer. First-principles calculations and Monte-Carlo simulations were performed to evaluate the exchange coupling constant between the Cr and Fe spin and the spin correlation functions of the Fe
₂
O
₃
/Cr
₂
O
₃
bilayer system in a finite temperature. We found that above the Néel temperature of Cr
₂
O
₃
, the length of the antiferromagnetic spin correlation in the bilayer system is increased by more than twice as that of the bulk system.