Magnetism of crystalline and nanostructured ZnFe2O4

被引：62
作者：
Burghart, FJ
Potzel, W
Kalvius, GM
Schreier, E
Grosse, G
Noakes, DR
Schäfer, W
Kockelmann, W
Campbell, SJ
Kaczmarek, WA
Martin, A
Krause, MK
机构：
[1] Tech Univ Munich, Dept Phys, D-85747 Garching, Germany
[2] Virginia State Univ, Dept Phys, Petersburg, VA 23806 USA
[3] Univ Bonn, Mineral Petrolog Inst, D-53115 Bonn, Germany
[4] Univ New S Wales, Univ Coll, ADFA, Sch Phys, Canberra, ACT 2600, Australia
[5] Australian Natl Univ, Canberra, ACT 0200, Australia
[6] Univ Jena, Chem Geowissensch Fak, D-07743 Jena, Germany
[7] Univ Leipzig, D-04103 Leipzig, Germany
来源：
PHYSICA B | 2000年 / 289卷
基金：
澳大利亚研究理事会;
关键词：
nanostructured magnet; ferrite; spin glass; superparamagnetism;
D O I：
10.1016/S0921-4526(00)00394-X
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We have investigated the magnetic properties of three differently prepared samples of the spinel ZnFe2 O-4 with mu SR, neutron diffraction, Mossbauer effect and magnetization measurements. Below T-N = 10.5 K, the first sample (annealed) shows long-range antiferromagnetic order in coexistence with short-range magnetic order. The second sample (rapidly quenched) shows only short-range magnetic order. The third sample (nanostructured with an average particle size of about 9 nm) exhibits ferromagnetism below T-c approximate to 460 K combined with superparamagnetism. Below the blocking temperature of similar to 50 K the nanostructured sample exhibits a dependence on applied magnetic fields similar to that observed in spin glass systems. The roles of cation-site occupation and magnetic couplings in governing the different magnetic behaviors exhibited by the samples are discussed. (C) 2000 Published by Elsevier Science B.V. All rights reserved.
引用
收藏
页码：286 / 290
页数：5
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