Skip to main content Accessibility help

Role of Morphology on the Large Coercive Behavior in Co 80 Ni 20 Nanowires

  • A. Gaul (a1), N. Ouar (a1), S. Mercone (a1), F. Zighem (a1), F. Schoenstein (a1), B. Leridon (a2), S. Farhat (a1) and N. Jouini (a1)...


Ferromagnetic metal CoNi-based nano-objects have been synthesized in a polyol media within different elaboration conditions in order to drive their morphology (i.e. enhancing their length-to-diameter ratio ﴾d/L﴿, and changing the diameter d ratio over edge T width ﴾d/L﴿). Transmission Electron Microscopy (TEM) studies revealed unexpected effects on the Co80Ni20 nano-objects arising from the magnetic field assisted synthesis. This gave us the opportunity to compare this latter to coming from the variation of Ruthenium (III) chloride hydrate nucleating agent concentration. A Co80Ni20 anisotropic particles elaboration was successfully achieved under zero magnetic field assisted synthesis, while an important percentage of isotropic nanoparticles appeared immediately under the application of a small magnetic field (i.e. H > 500 Oe). In the first case we were able to sharply drive both the aspect ratio and head morphology of nanowires (T and ﴾d/T﴿). The good crystallinity and structures symmetry of all our samples have been proved by X-Ray Diffraction (XRD) pattern analysis. Magnetic static properties showed a ferromagnetic standard behavior with a coercive field efficiency which was strongly dependent on shape parameters. The magnetic static behavior was studied within a standard Stoner-Wohlfart model as a function of the observed morphologies. Our observations are fully consistent with a shape anisotropy origin behavior of the enhanced coercivity measured as function of the decreasing ﴾d/L﴿ ratio. However, they revealed the presence of contributions to the global effective anisotropy coming from other complex terms then the shape one (i.e. conic head impressiveness, dipolar interactions and magnetocrystalline anisotropy).


Corresponding author

*Corresponding author:


Hide All
1 Ouar, N., Schoenstein, F., Mercone, S., Farhat, S., Villeroy, B., Leridon, B., J. Appl. Phys. 114(16), 163907 (2013)
2 McGray, P.D., Tan, L., Zou, J., Stadler, B. J. H., Downey, P. R. and Flatau, A. B., J. Appl. Phys. 99, 08B310 (2006)
3 Dumestre, F., Chaudret, B., Amiens, C., Respaud, M., Fejes, P., Renaud, P., and Zurcher, P., Angew. Chem Int. Ed. 42, 52135216 (2003), A. I. Gapin, X. R. Ye, J. F. Aubuchon, L. H. Chen, Y. J. Tang, and S. Jin, J. Appl. Phys. 99, 08G902(2006)
4 , S. Parkin, S. P., Hayashi, M., Thomas, L., Science 320, 190 (2008)
5 Ye, B., Lia, F., Cimpoesu, D., Wileya, J.B., Jung, J.-S., Stancu, A., Spinu, L., J. Magn. Magn. Mater 316, E56 (2007)
6 Ott, F., Maurer, T., Chaboussant, G., Soumare, Y., Piquemal, J.-Y., Viau, G., J. Appl. Phys. 105, 013915 (2009); T. Maurer, F. Zighem, F. Ott, G. Chaboussant, G. André, Y. Soumare, J.- Y. Piquemal, G. Viau, C. Gatel, Phys. Rev. B 80, 064427(2009)
7 Soumare, Y., Piquemal, J.-Y., Maurer, T., Ott, F., Chaboussant, G., Falqui, A. and Viau, G., J. Mater. Chem. , 18, 56965702 (2008)
8 Lutterotti, L., Chategnier, D., Ferrari, S., Ricote, J., Thin Solid Films, 450, 1, 134137 (2004)
9 Ait Atmane, K., Zighem, F., Soumare, Y., Ibrahim, M., Boubekri, R., Maurer, T., Margueritat, J., Piquemal, J.-Y., Ott, F., Chaboussant, G., Schoenstein, F., Jouini, N. and Viau, G., J. Sol. State Chem. , 197, 297303, (2013)
10 Viau, G., Garcia, C., Maurer, T., Chaboussant, G., Ott, F., Soumare, Y., Piquemal, J.Y., Physica Status Solidi A 206, 663666, (2009)
11 Ung, D., Viau, G., Fievet-Vincent, F., Herbst, F., Richard, V., Fievet, F., Progress in Solid State Chemistry 33 137145, (2005)
12 Liu, P., Li, Z., Zhao, B., Yadian, B., Zhang, Y., Mat. Lett. 63 (2009) 16501652 ; J. Wang, Q. Chen, C. Zeng, and B. Hou, Adv. Mater., 16, 137–140, (2004); A. A. Farghaly, Z. J. Huba, E. E. Carpenter, J. Nanopart Res 14,1159, (2012); N.S. Gajbhie, S. Srivastava, S. Kurian, B.R. Behta and V.N. Singh, J. Phys. Conf. Ser. 200, 072093, (2010)
13 Sun, L., Hao, Y., Chien, C-L., Searson, P. C., IBM J. of Res. and Develop., 49, 1, 79 (2005)



Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed