Co-doped ferrite single domains and the effect of metallic nanoinclusions

Applied Physics Letters

Volumn 69, Issue 18, 1996, Pages 2761-2763

  Multigner, M ^a   Lakamp S ^b   Pourroy, G ^b   Hernando, A ^a   Valenzuela, R ^c  

^a INSTITUTO DE MAGNETISMO APLICADO   (Spain)

^b INSTITUT DE PHYSIQUE ET CHIMIE DES MATÉRIAUX DE STRASBOURG   (France)

^c INSTITUTO DE INVESTIGACIONES EN MATERIALES   (Mexico)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 0000977870     PISSN: 00036951     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.117667     Document Type: Article

References (13)

1. R. L. Meng, Y. Q. Wang, C. S. Lin, A. Bensaoula, C. W. Chu, P. H. Hor, and A. Ignatiev, J. Appl. Phys. 61, 3883 (1987).
2. E. P. Wohlfarth, Ferromagnetic Materials (North-Holland, Amsterdam 1980).
3. A. Malats i Riera, G. Pourroy, and P. Poix, J. Mater. Sci. Eng. A 168, 245 (1993).
4. A. Malats i Riera, G. Pourroy, and P. Poix, J. Magn. Magn. Mater. 134, 195 (1994).
5. J. C. Yamegni Noubeyo, G. Pourroy, J. Werckmann, A. Malats i Riera, G. Ehret, and P. Poix, J. Am. Ceram. Soc. (to be published).
6. R. Valenzuela, Magnetic Ceramics (Cambridge University Press, Cambridge, 1994).
7. E. C. Stoner and E. P. Wohlfarth, Philos. Trans. R. Soc. London, Ser. A 240, 599 (1948).
8. C. D. Mee and J. C. Jeschke, J. Appl. Phys. 34, 1271 (1963).
9. S. Chikazumi, Physics of Magnetism (Krieger, Malabar, FL, 1992).
10. A. Hernando, J. Magn. Magn. Mater. 117, 154 (1992).
11. A. Hernando, I. Navarro, and J. Gonzalez, Europhys. Lett. 20, 175 (1992).
12. R. Skemski and J. M. D. Coey, Phys. Rev. B 48, 15 812 (1993).
13. In the absence of metallic inclusions, for single spinel phase, the magnetization reversal might also be due to domain nucleation; however, the high value of the coercivity point out that the nucleation process requires an energy very close to the corresponding to coherent rotation of the magnetization. The values of coercivity become a little lower than the anisotropy field probably due, as discussed here, to the effect of intense local demagnetizing field. In summary, we should say that according to the remanence value as well as to the coercivity strength the magnetization reversal of the spinel particles seems to occur by coherent magnetization rotation which gives rise to either pure rotation or reversal domain nucleation.