The effects of surface spin on magnetic properties of weak magnetic ZnLa0.02Fe1.98O4 nanoparticles

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• 作者：Shitao Xu (3) (4)
  Yongqing Ma (3)
  Yuanfeng Xu (3)
  Xiao Sun (3)
  Bingqian Geng (3)
  Ganhong Zheng (3)
  Zhenxiang Dai (3)
  
  3. Anhui Key Laboratory of Information Materials and Devices ; School of Physics and Materials Science ; Anhui University ; Hefei ; 230039 ; People鈥檚 Republic of China
  4. School of Physics and Electronic Information ; Huaibei Normal University ; Huaibei ; 235000 ; People鈥檚 Republic of China
  
• 关键词：Nanoparticles ; Ferrite ; Surface spin ; Magnetic properties
• 刊名：Nanoscale Research Letters
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：9
• 期：1
• 全文大小：1,011 KB
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• 刊物主题：Nanotechnology; Nanotechnology and Microengineering; Nanoscale Science and Technology; Nanochemistry; Molecular Medicine;
• 出版者：Springer US
• ISSN：1556-276X

文摘

In order to prominently investigate the effects of the surface spin on the magnetic properties, the weak magnetic ZnLa0.02Fe1.98O4 nanoparticles were chosen as studying objects which benefit to reduce as possibly the effects of interparticle dipolar interaction and crystalline anisotropy energies. By annealing the undiluted and diluted ZnLa0.02Fe1.98O4 nanoparticles at different temperatures, we observed the rich variations of magnetic ordering states (superparamagnetism, weak ferromagnetism, and paramagnetism). The magnetic properties can be well understood by considering the effects of the surface spin of the magnetic nanoparticles. Our results indicate that in the nano-sized magnets with weak magnetism, the surface spin plays a crucial rule in the magnetic properties.