Spin-glass-like freezing and enhanced magnetization in ultra-small CoFe2O4nanoparticles
Source abstract
Abstract
The magnetic properties of ultra-small (3 nm) CoFe(2)O(4) nanoparticles have been investigated by DC magnetization measurements as a function of temperature and magnetic field. The main features of the magnetic behaviour are blocking of non-interacting particle moments (zero-field-cooled magnetization T(max) approximately 40 K), a rapid increase of saturation magnetization (up to values higher than for the bulk material) at low T and an increase in anisotropy below 30 K due to the appearance of exchange bias. The low temperature behaviour is determined by a random freezing of surface spins. Localized spin-canting and cation distribution between the two sublattices of the spinel structure account quantitatively for the observed increase in saturation magnetization.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Magnetic Properties and Synthesis of Ferrites · Iron oxide chemistry and applications · Magnetic properties of thin films
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (47)
Show source-provided references
1. 10.1021/jp801663410.1021/jp8016634 ↗
2. Perez N · Nanotechnology · 2008 · 19 · 47570410.1088/0957-4484/19/47/475704 ↗
3. Roca A G · Nanotechnology · 2006 · 17 · 278310.1088/0957-4484/17/11/010 ↗
4. Dormann J L · Advanced In Chemical Physics · 1997 · XCVIII
5. 10.1063/1.235447510.1063/1.2354475 ↗
6. 10.1016/S0304-8853(02)01237-410.1016/S0304-8853(02)01237-4 ↗
7. West A R · Solid State Chemistry and its Applications · 1984
8. 10.1103/PhysRevLett.80.18110.1103/PhysRevLett.80.181 ↗
9. 10.1103/PhysRevLett.27.114010.1103/PhysRevLett.27.1140 ↗
10. 10.1063/1.219147110.1063/1.2191471 ↗
11. 10.1016/0304-8853(94)01627-510.1016/0304-8853(94)01627-5 ↗
12. 10.1063/1.216384410.1063/1.2163844 ↗
13. 10.1103/PhysRevLett.79.139310.1103/PhysRevLett.79.1393 ↗
14. 10.1103/PhysRevB.72.18443510.1103/PhysRevB.72.184435 ↗
15. 10.1016/S0921-4526(02)00682-810.1016/S0921-4526(02)00682-8 ↗
16. 10.1021/cm060650n10.1021/cm060650n ↗
17. Morrish A H · The Physical Principles of Magnetism · 1965
18. 10.1063/1.172323210.1063/1.1723232 ↗
19. 10.1063/1.37299610.1063/1.372996 ↗
20. 10.1103/PhysRevB.9.389110.1103/PhysRevB.9.3891 ↗
21. 10.1016/S0304-8853(99)00238-310.1016/S0304-8853(99)00238-3 ↗
22. Chantrell R W O’Grady K Dormann J L Fiorani D · Proc. Int. Workshop on Studies of Magnetic Properties of Fine Particles and their Relevance to Materials Science · 1991
23. 10.1016/S0304-8853(99)00499-010.1016/S0304-8853(99)00499-0 ↗
24. 10.1016/S0304-8853(96)00277-610.1016/S0304-8853(96)00277-6 ↗
25. 10.1103/PhysRevB.66.17441810.1103/PhysRevB.66.174418 ↗
26. 10.1016/S0304-8853(00)00369-310.1016/S0304-8853(00)00369-3 ↗
27. 10.1103/PhysRevB.51.1152710.1103/PhysRevB.51.11527 ↗
28. 10.1063/1.36828210.1063/1.368282 ↗
29. 10.1103/PhysRevB.59.632110.1103/PhysRevB.59.6321 ↗
30. 10.1016/j.jmmm.2003.12.09110.1016/j.jmmm.2003.12.091 ↗
31. 10.1103/PhysRevLett.81.324310.1103/PhysRevLett.81.3243 ↗
32. 10.1103/PhysRevB.70.17440210.1103/PhysRevB.70.174402 ↗
33. 10.1103/PhysRevB.71.10440510.1103/PhysRevB.71.104405 ↗
34. 10.1063/1.35827510.1063/1.358275 ↗
35. 10.1109/20.95112110.1109/20.951121 ↗
36. 10.1007/b13649410.1007/b136494 ↗
37. 10.1063/1.128723010.1063/1.1287230 ↗
38. 10.1023/A:101109271213610.1023/A:1011092712136 ↗
39. 10.1103/PhysRevB.60.340010.1103/PhysRevB.60.3400 ↗
40. 10.1016/S0304-8853(03)00462-110.1016/S0304-8853(03)00462-1 ↗
41. 10.1103/PhysRevB.62.112410.1103/PhysRevB.62.1124 ↗
42. 10.1063/1.165622410.1063/1.1656224 ↗
43. 10.1007/s10051005107910.1007/s100510051079 ↗
44. 10.1016/j.ica.2008.03.07310.1016/j.ica.2008.03.073 ↗
45. 10.1063/1.34019710.1063/1.340197 ↗
46. 10.1103/PhysRev.187.74710.1103/PhysRev.187.747 ↗
47. 10.1063/1.134700110.1063/1.1347001 ↗