Finite-size scaling effect on Neel temperature of antiferromagnetic Cr2O3 (0001) films in exchange-coupled heterostructures

被引：39

作者：

Pati, Satya Prakash ^{[1
]}

Al-Mahdawi, Muftah ^{[1
]}

Ye, Shujun ^{[1
]}

Shiokawa, Yohei ^{[1
]}

Nozaki, Tomohiro ^{[1
]}

Sahashi, Masashi ^{[1
]}

机构：

[1] Tohoku Univ, Dept Elect Engn, Sendai, Miyagi 9808579, Japan

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 22期

关键词：

CRITICAL EXPONENTS; HEISENBERG MODELS; SUPERLATTICES; MAGNETIZATION; SCATTERING; CRYSTAL;

D O I：

10.1103/PhysRevB.94.224417

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The scaling of antiferromagnetic ordering temperature of corundum-type chromia films has been investigated. Neel 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.

引用

页数：8

共 54 条

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