Structure and magnetic properties of Fe/Fe oxide clusters
Source abstract
Abstract
Fe clusters have been synthesised in ultra-high-vacuum chamber using a gas-stabilized cluster aggregation method that ensures good control of the cluster size and naturally oxidized in order to obtain Fe/Fe oxide core-shell nanoparticles. The morphology of an individual nanoparticle, as revealed by transmission electron microscopy, consists of a Fe core of an average diameter of 4.4 nm surrounded by an oxide shell of uniform thickness of about 1.2 nm in average. The nanoparticles may be assimilated with a ferro-/antiferromagnetic (FM/AF) system. The morpho-structural features have been correlated with magnetic measurements on the core-shell nanoparticles. A significant exchange bias effect has been measured, when the sample was field-cooled under an applied field of 3 T. As the morphology of core-shell nanoclusters is much more complicated than in FM/AF bilayers of regular thickness due to the particular geometry of the coronal AF layer, the shape and surface anisotropy have to be taken into account for a correct interpretation of the magnetic data.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnetic properties of thin films · Iron oxide chemistry and applications · Magnetic Properties and Synthesis of Ferrites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (29)
Show source-provided references
1. Ambrose T, Liu K, Chien CL (1999) Doubly exchange-biased NiCoO/NiFe/Cu/NiFe/NiCoO spin valves. J Appl Phys 85:6124–6126. doi: 10.1063/1.37028210.1063/1.370282 ↗
2. Andrä W, Nowak H (2006) (eds) Magnetism in medicine: a handbook. Wiley-VCH Interscience, New York10.1002/9783527610174 ↗
3. Berven CA, Wybourne MN, Longstreth L, Hutchison JE (2003) Nanoparticle based boolean logic. Physica E 19:246–250. doi: 10.1016/S1386-9477(03)00324-210.1016/S1386-9477(03)00324-2 ↗
4. Binns C, Baker SH, Louch S, Sirotti F, Cruguel H, Prieto P et al (2004) Building high-performance magnetic materials out of gas-phase nanoclusters. Appl Surf Sci 226:249–260. doi: 10.1016/j.apsusc.2003.11.06910.1016/j.apsusc.2003.11.069 ↗
5. Bonetti E, del Bianco L, Signoretti S, Tiberto P (2001) Synthesis by ball milling and characterization of nanocrystalline Fe3O4 and Fe/Fe3O4 composite system. J Appl Phys 89:1806–1815. doi: 10.1063/1.133985510.1063/1.1339855 ↗
6. Chen M, Nikles DE (2002) Synthesis of spherical FePd and CoPt nanoparticles. J Appl Phys 91:8477–8479. doi: 10.1063/1.145640610.1063/1.1456406 ↗
7. Crisan O, Angelakeris M, Kehagias T, Simeonidis K, Giersig M, Flevaris NK (2006) Structure effects on the magnetism of AgCo nanoparticles. Acta Mater 54:5251–5260. doi: 10.1016/j.actamat.2006.06.05310.1016/j.actamat.2006.06.053 ↗
8. Crisan O, von Haeften K, Ellis AM, Binns C (2008) Novel gas-stabilised iron clusters: synthesis, structure and magnetic behaviour. Nanotechnology (to appear)10.1088/0957-4484/19/50/505602 ↗
9. De Toro JA, Andres JP, Gonzalez JA, Muniz P, Munoz T, Normile PS et al (2006) Exchange bias and nanoparticle magnetic stability in Co-CoO composites. Phys Rev B 73:094449–094455. doi: 10.1103/PhysRevB.73.09444910.1103/PhysRevB.73.094449 ↗
10. del Bianco L, Fiorani D, Testa AM, Bonetti E, Savini L, Signoretti S (2002) Magnetothermal behavior of a nanoscale Fe/Fe oxide granular system. Phys Rev B 66:174418–174429. doi: 10.1103/PhysRevB.66.17441810.1103/PhysRevB.66.174418 ↗
11. del Bianco L, Fiorani D, Testa AM, Bonetti E, Signorini L (2004) Field-cooling dependence of exchange bias in a granular system of Fe nanoparticles embedded in an Fe oxide matrix. Phys Rev B 70:052401–052405. doi: 10.1103/PhysRevB.70.05240110.1103/PhysRevB.70.052401 ↗
12. Dumitrache F, Morjan I, Alexandrescu R, Ciupina V, Prodan G, Voicu I et al (2005) Iron–iron oxide core–shell nanoparticles synthesized by laser pyrolysis followed by superficial oxidation. Appl Surf Sci 247:25–31. doi: 10.1016/j.apsusc.2005.01.03710.1016/j.apsusc.2005.01.037 ↗
13. Hilger I, Kiessling A, Romanus E, Hiergeist R, Hergt R, Andra W et al (2004) Magnetic nanoparticles for selective heating of magnetically labeled cells in culture: preliminary investigation. Nanotechnology 15:1027–1032. doi: 10.1088/0957-4484/15/8/02910.1088/0957-4484/15/8/029 ↗
14. Martinez-Boubeta C, Simeonidis K, Angelakeris M, Pazos-Perez N, Giersig M, Delimitis A et al (2006) Critical radius for exchange bias in naturally oxidized Fe nanoparticles. Phys Rev B 74:054430–054440. doi: 10.1103/PhysRevB.74.05443010.1103/PhysRevB.74.054430 ↗
15. Meiklejohn WH, Bean CP (1956) New magnetic anisotropy. Phys Rev 102:1413–1414. doi: 10.1103/PhysRev.102.141310.1103/PhysRev.102.1413 ↗
16. Miguel OB, Morales MP, Tartaj P, Ruiz-Cabello J, Bonville P, Santos M et al (2005) Fe-based nanoparticulate metallic alloys as contrast agents for magnetic resonance imaging. Biomaterials 26:5695–5703. doi: 10.1016/j.biomaterials.2005.02.02010.1016/j.biomaterials.2005.02.020 ↗
17. Miguel OB, Tartaj P, Morales MP, Bonville P, Schindler UG, Zhao XQ et al (2006) Core-shell iron-iron oxide nanoparticles synthesized by laser-induced pyrolysis. Small 2:1476–1483. doi: 10.1002/smll.20060020910.1002/smll.200600209 ↗
18. Nogués J, Lederman D, Moran TJ, Schuller IK (1996) Positive exchange bias in FeF2-Fe bilayers. Phys Rev Lett 76:4624–4627. doi: 10.1103/PhysRevLett.76.462410.1103/PhysRevLett.76.4624 ↗
19. Nogués J, Sort J, Langlais V, Doppiu S, Dieny B, Muñoz JS et al (2005) Exchange bias in ferromagnetic nanoparticles embedded in an antiferromagnetic matrix. Int J Nanotechnol 2:23–4210.1504/IJNT.2005.006973 ↗
20. Peng DL, Sumiyama K, Konno TJ, Hihara T, Yamamuro S (1999) Characteristic transport properties of CoO-coated monodispersive Co cluster assemblies. Phys Rev B 60:2093–2100. doi: 10.1103/PhysRevB.60.209310.1103/PhysRevB.60.2093 ↗
21. Peng DL, Sumiyama K, Hihara T, Yamamuro S, Konno TJ (2000) Magnetic properties of monodispersed Co/CoO clusters. Phys Rev B 61:3103–3109. doi: 10.1103/PhysRevB.61.310310.1103/PhysRevB.61.3103 ↗
22. Presting H, Konig U (2003) Future nanotechnology developments for automotive applications. Mater Sci Eng C 23:737–741. doi: 10.1016/j.msec.2003.09.12010.1016/j.msec.2003.09.120 ↗
23. Skomski R (2003) Nanomagnetics. J Phys Condens Matter 15:R841–R896. doi: 10.1088/0953-8984/15/20/20210.1088/0953-8984/15/20/202 ↗
24. Skumryev V, Stoyanov S, Zhang Y, Hadjipanayis G, Givord D, Nogues J (2003) Beating the superparamagnetic limit with exchange bias. Nature 423:850–853. doi: 10.1038/nature0168710.1038/nature01687 ↗
25. Sun S, Murray CB, Weller D, Folks L, Moser A (2000) Monodisperse FePt nanoparticles and ferromagnetic FePt nanocrystal superlattices. Science 287:1989–1992. doi: 10.1126/science.287.5460.198910.1126/science.287.5460.1989 ↗
26. Tartaj P, del Puerto Morales M, Veintemillas-Verdaguer S, González-Carreño T, Serna C (2003) The preparation of magnetic nanoparticles for applications in biomedicine. J Phys D Appl Phys 36:R182. doi: 10.1088/0022-3727/36/13/20210.1088/0022-3727/36/13/202 ↗
27. Teo BK, Zhang H (1991) Clusters of clusters: self-organization and self-similarity in the intermediate stages of cluster growth of Au-Ag supraclusters. Proc Natl Acad Sci USA 88:5067–5071. doi: 10.1073/pnas.88.12.506710.1073/pnas.88.12.5067 ↗
28. Wang CM, Baer DR, Amonette JE, Engelhard MH, Qiang Y, Antony J (2007) Morphology and oxide shell structure of iron nanoparticles grown by sputter-gas-aggregation. Nanotechnology 18:255603–255610. doi: 10.1088/0957-4484/18/25/25560310.1088/0957-4484/18/25/255603 ↗
29. Zhang C, Wangler B, Morgenstern B, Zentgraf H, Eisenhut M, Untenecker H et al (2007) Silica- and alkoxysilane-coated ultrasmall superparamagnetic iron oxide particles: a promising tool to label cells for magnetic resonance imaging. Langmuir 23:1427–1434. doi: 10.1021/la061879k10.1021/la061879k ↗