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

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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