Finite-size effect on Néel temperature in antiferromagnetic nanoparticles

作     者：X. G. Zheng C. N. Xu K. Nishikubo K. Nishiyama W. Higemoto W. J. Moon E. Tanaka E. S. Otabe 

作者机构：Department of Computer Science and Electronics Faculty of Computer Science and Systems Engineering Kyushu Institute of Technology Fukuoka 820-8502 Japan 

出 版 物：《Physical Review B》 (Phys. Rev. B Condens. Matter Mater. Phys.)

年 卷 期：2005年第72卷第1期

页      面：014464-014464页

核心收录：

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

摘      要：Muon spin relaxation/rotation (μSR) and magnetic susceptibility measurements were carried out on antiferromagnetic nanoparticles of CuO. Nanoparticles with center size of around 5 nm were prepared by ball-milling from single crystals of CuO and investigated using μSR measurements. In the ∼5nm assembly, the TN was reduced drastically to ∼30K, compared with the bulk TN=229K. A similar effect was observed in a system of 2 to 3 nm diameter nanorods, which was synthesized by a direct solution reaction method, where TN was suppressed further to 13 K. The present work reports direct evidence of a dramatic finite-size effect on the magnetic transition temperature in antiferromagnetic systems.