Skip to main content Accessibility help
×
Home

Synthesis and Characterization of Antiferromagnetic Kmnf3 Nanoparticles

  • C. Sangregorio (a1), E. E. Carpenter (a1) and C. J. O'connor (a1)

Abstract

The magnetic properties of nanosized antiferromagnetic particles of KMnF3 are presented. The particles were synthesized using the microemulsion technique, i.e. by using the aqueous core of reverse micelles as constrained microreactors for the precipitation of the particles. The structural characterization of the samples, accomplished by TEM and XRD, reveal that the samples consist of cubic-shaped, crystalline KMnF3 nanoparticles of uniform size. Control over the average size of the particles was achieved by changing the reaction time. Four different samples of average size in the range 13-35 nm were prepared. DC magnetic susceptibility measurements revealed superparamagnetic behavior of the particles. Hysteresis loops measured after field cooling the samples through TN were shifted. The shift is ascribed to the exchange coupling between the antiferromagnetic core of the particles and the uncompensated spin shell surrounding it.

Copyright

References

Hide All
1. Schweneder, A. R., Chimica 46 69 (1992)
2. Gee, A. D.Cell Separation Methods and Applications” Eds. Recktenwald, D. and Radbrush, A., pp. 175 Marcel Dekker, Inc., New York USA 1997.
3. Nanomaterials: Synthesis, Properties and Applications Eds. Edelstein, A. S. and Cammarata, R. C.; Institute of Physics Publishing, Bristol PA (1996).
4. Néel, L., Compt. Rend. (Paris), 252, 4075 (1961).
5. Néel, L. Proc. Int. Conf Magn. Crys. Tokyo, 1961, J. Phys. Soc. Jpn. 17 676 (1962)
6. Cohen, J.; Creer, K. M.; Pauthenet, R.; Srivastava, K.; Proc. Int. Conf. Magn. Crys. Tokyo, 1961, J. Phys. Soc. Jpn. 17 685 (1962)
7. Creer, K. M.; Proc. Int. Conf. Magn. Crys. Tokyo, 1961, J. Phys. Soc. Jpn. 17 690 (1962)
8. Gider, S. Awschalom, D. D., Douglas, T., Mann, S., Chapara, M. Science 268 77 (1995)
9. Barbara, B.; Chudnovsky, E. M.; Phys. Lett. 145A 205 (1990)
10. Schieber, M. MExperimental Magnetochemistry” Ed. Wohlfarth, E. P. John Wiley & Sons. Inc. New York 1967
11. Pillai, V.; Kumar, P.; Hou, M. J.; Ayyub, P.; Shah, D. O.; Adv. Colloid Interface Sci. 55 241 (1995)
12. Moumen, N.; Pileni, M. P. Chem. Mater. 8 1128 (1996)
13. Roth, M., Hempelmann, R., Chem. Mater., 10, 78 (1998).
14. Kodama, R. H., Makhlouf, S. A., Berkowitz, A. E., Phys. Rev. Lett., 79, 1393 (1997)
15. Sako, S.; Umemura, Y.; Oshima, K.; Sakai, M.; Bandow, S.; J. Phys. Soc. Jpn. 65 280 (1995)
16. Meiklejohn, W. H., Bean, C. P., Phys. Rev. 102 1413 (1956)

Metrics

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