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 (6)

• Atomistic spin model simulations of magnetic nanomaterials
• Robust isothermal electric switching of interface magnetization: A route to voltage-controlled spintronics
• The Effect of the Environment on alpha-Al_2O_3 (0001) Surface Structures
• Enhanced spin pumping efficiency in antiferromagnetic IrMn thin films around the magnetic phase transition
• Equilibrium magnetization at the boundary of a magnetoelectric antiferromagnet
• Magnetoelectric domain wall dynamics and its implications for magnetoelectric memory

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• Disclosing antiferromagnetism in tetragonal Cr2O3 by electrical measurements
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• Antiferromagnetic nanoscale bit arrays of magnetoelectric Cr${}_2$O${}_3$ thin films