Hostname: page-component-7dd5485656-7jgsp Total loading time: 0 Render date: 2025-10-31T00:34:19.222Z Has data issue: false hasContentIssue false
  • English
  • Français

Cobalt–ferrite nanobowl arrays: Curved magnetic nanostructures

Published online by Cambridge University Press:  03 March 2011

A.K. Srivastava ,
S. Madhavi ,
T.J. White  and
R.V. Ramanujan
A.K. Srivastava
Affiliation:
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
S. Madhavi
Affiliation:
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
T.J. White
Affiliation:
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
R.V. Ramanujan*
Affiliation:
School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798
*
a) Address all correspondence to this author. e-mail: ramanujan@ntu.edu.sg
Get access

Abstract

Novel magnetic cobalt ferrite nanostructures with curved surfaces (i.e., nanobowls and hollow nanospheres) in a periodic array have been fabricated by in situ reduction of a cobalt and iron salt solution mixture in the interstitial spaces of three-dimensional, close-packed, polystyrene sphere templates. The effect of the shape created by this nanostructure and magnetocrystalline anisotropy introduced by suitable annealing were used to tailor the coercivity to values relevant to high-density data-storage applications.

Keywords

Chemical synthesisMagnetic propertiesNanostructure

Information

Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 5 , May 2007 , pp. 1250 - 1254
Copyright
Copyright © Materials Research Society 2007

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

REFERENCES

1Willard, M.A., Kurihara, L.K., Carpenter, E.E., Calvin, S., and Harris, V.G.: Chemically prepared magnetic nanoparticles. Inter. Mater. Rev. 49, 125 (2004).CrossRefGoogle Scholar
2Hyeon, T.: Chemical synthesis of magnetic nanoparticles. Chem. Commun. 927 (2003).CrossRefGoogle ScholarPubMed
3Liu, C-M., Guo, L., Wang, R-M., Deng, Y., Xu, H-B., and Yang, S.: Magnetic nanochains of metal formed by assembly of small nanoparticles. Chem. Commun. 2726 (2004).CrossRefGoogle ScholarPubMed
4Puntes, V.F., Krishnan, K.M., and Alivisatos, P.: Colloidal nanocrystal shape and size control: The case of cobalt. Science 291, 2115 (2001).CrossRefGoogle ScholarPubMed
5Bartlett, P.N., Ghanem, M.A., Hallag, I.S.E., Groot, P.D., and Zhukov, A.: Electrochemical deposition of macroporous magnetic networks using colloidal templates. J. Mater. Chem. 13, 2596 (2003).CrossRefGoogle Scholar
6Srivastava, A.K., Madhavi, S., White, T.J., and Ramanujan, R.V.: Template assisted assembly of cobalt nanobowl arrays. J. Mater. Chem. 15, 4424 (2005).CrossRefGoogle Scholar
7Ulbrich, T.C., Makarov, D., Hu, G., Guhr, I.L., Suess, D., Schrefl, T., and Albrecht, M.: Magnetization reversal in a novel gradient nanomaterial. Phys. Rev. Lett. 96, 077202 (2006).CrossRefGoogle Scholar
8Albrecht, M., Hu, G., Guhr, I.L., Ulbrich, T.C., Boneberg, J., Leiderer, P., and Schatz, G.: Magnetic multilayers on nanospheres. Nat. Mater. 4, 203 (2005).CrossRefGoogle ScholarPubMed
9Berry, C.C.: Possible exploitation of magnetic nanoparticles: Cell interaction for biomedical applications. J. Mater. Chem. 15, 543 (2005).CrossRefGoogle Scholar
10Liu, Q., Liu, H., Han, M., Zhu, J., Liang, Y., Xu, Z., and Song, Y.: Nanometer-sized nickel hollow spheres. Adv. Mater. 17, 1995 (2005).CrossRefGoogle Scholar
11Iskandar, F., Iwaki, T., Toda, T., and Okuyama, K.: High coercivity of ordered macroporous FePt films synthesized via colloidal templates. Nano Lett. 5, 1525 (2005).CrossRefGoogle ScholarPubMed
12Wang, Y., Zhu, Q., and Zhang, H.: Fabrication of β-Ni(OH)2 and NiO hollow spheres by a facile template-free process. Chem. Commun. 5231 (2005).CrossRefGoogle ScholarPubMed
13Daimon, H., Kitakami, O., Inagoya, O., and Sakemoto, A.: Magnetic properties of Fe-Cu and Fe-P electrodeposited alumite films. Jpn. J. Appl. Phys. 30, 282 (1991).CrossRefGoogle Scholar
14Zhukov, A.A., Goncharov, A.V., de Groot, P.A.J., Bartlett, P.N., and Ghanem, M.A.: Magnetic antidot arrays from self-assembly template methods. J. Appl. Phys. 93, 7322 (2003).CrossRefGoogle Scholar
15Bartlett, P.N., Birkin, P.R., and Ghanem, M.A.: Electrochemical deposition of macroporous platinum, palladium and cobalt films using polystyrene latex sphere templates. Chem. Commun. 1671 (2000).CrossRefGoogle Scholar
16Yan, H., Blanford, C.F., Smyrl, W.H., and Stein, A.: Preparation and structure of 3D ordered macroporous alloys by PMMA colloidal crystal templating. Chem. Commun. 1477 (2000).CrossRefGoogle Scholar
17Srivastava, A.K., Madhavi, S., White, T.J., and Ramanujan, R.V.: The processing and characterization of magnetic nanobowls. Thin Solid Films 505, 93 (2006).CrossRefGoogle Scholar
18Bhattacharyya, S., Salvetat, J-P., Fleurier, R., Husmann, A., Cacciaguerra, T., and Saboungi, M-L.: One step synthesis of highly crystalline and high coercive cobalt-ferrite nanocrystals. Chem. Commun. 4818 (2005).CrossRefGoogle ScholarPubMed
19Song, Q. and Zhang, Z.J.: Shape control and associated magnetic properties of spinel cobalt ferrite nanocrystals. J. Am. Chem. Soc. 126, 6164 (2004).CrossRefGoogle ScholarPubMed
20Li, S., John, V.T., O’Connor, C., Harris, V., and Carpenter, E.: Cobalt-ferrite nanoparticles: Structure, cation distributions, and magnetic properties. J. Appl. Phys. 87, 6223 (2000).CrossRefGoogle Scholar
21Jung, J-S., Lim, J-H., Choi, K-H., Oh, S-L., Kim, Y-R., Lee, S-H., Smith, D.A., Stokes, K.L., Malkinski, L., and O’Connor, C.J.: CoFe2O4 nanostructures with high coercivity. J. Appl. Phys. 97, 10F306 (2005).CrossRefGoogle Scholar
22Yoshikawa, H., Hayashida, K., Kozuka, Y., Horiguchi, A., Awaga, K., Bandow, S., and Iijima, S.: Preparation and magnetic properties of hollow nano-spheres of cobalt and cobalt oxide: Drastic cooling-field effects on remnant magnetization of antiferromagnet. Appl. Phys. Lett. 85, 5287 (2004).CrossRefGoogle Scholar
23Li, S., Liu, L., John, V.T., O’Connor, C.J., and Harris, V.G.: Cobalt–ferrite nanoparticles: correlations between synthesis procedures, structural characteristics and magnetic properties. IEEE Trans. Magn. 37, 2350 (2001).Google Scholar
24Wang, Y., Zhu, Q., and Zhang, H.: Fabrication and magnetic properties of hierarchical porous hollow nickel microspheres. J. Mater. Chem. 16, 1212 (2006).CrossRefGoogle Scholar
25Duan, G., Cai, W., Li, Y., Li, Z., Cao, B., and Luo, Y.: Transferable ordered Ni hollow sphere arrays induced by electrodeposition on colloidal monolayer. J. Phys. Chem. B 110, 7184 (2006).CrossRefGoogle ScholarPubMed
26Li, S.P., Lew, W.S., Xu, Y.B., Hirohata, A., Samad, A., Baker, F., and Bland, J.A.C.: Magnetic nanoscale dots on colloid crystal surfaces. Appl. Phys. Lett. 76, 748 (2000).CrossRefGoogle Scholar
27Skomski, R.: Domain-wall curvature and coercivity in pinning type Sm–Co magnets. J. Appl. Phys. 81, 5627 (1997).CrossRefGoogle Scholar