Finite-size scaling effect on Néel temperature of antiferromagnetic Cr${}_2$O${}_3$-(0001) films in an exchange-coupled heterostructure

Abstract

The scaling of antiferromagnetic ordering temperature of corundum-type chromia films have been investigated. Néel temperature $T_N$ was determined from the effect of perpendicular exchange-bias on the magnetization of a weakly-coupled adjacent ferromagnet. For a thick-film case, the validity of detection is confirmed by a susceptibility measurement. Detection of $T_N$ was possible down to 1-nm-thin chromia films. The scaling of ordering temperature with thickness was studied using different buffering materials, and compared with Monte-Carlo simulations. The spin-correlation length and the corresponding critical exponent were estimated, and they were consistent between experimental and simulation results. The spin-correlation length is an order of magnitude less than cubic antiferromagnets. We propose that the difference is from the change of number of exchange-coupling links in the two crystal systems.

References in corpus (2)

• Robust isothermal electric switching of interface magnetization: A route to voltage-controlled spintronics
• Equilibrium magnetization at the boundary of a magnetoelectric antiferromagnet

Cited by in corpus (4)

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• Structural Twinning-induced Insulating Phase in CrN (111) Films
• Disclosing antiferromagnetism in tetragonal Cr2O3 by electrical measurements
• Stabilization of a honeycomb lattice of IrO${}_6$ octahedra in superlattices with ilmenite-type MnTiO${}_3$