Abstract
The magnetic, optical, and magnetooptical properties of granular (FePt)1−x (SiO2)x nanocomposites in the disordered state and after heat treatment were studied. The magnetooptical response of samples in which the concentration of the metallic component approached the percolation threshold was observed to become considerably enhanced. Modeling transverse Kerr effect (TKE) spectra in a straightforward effective medium approximation provided a qualitative fit to the experimental data over a broad concentration range. The dependences of the Kerr effect on the SiO2 concentration in the nanocomposite are not monotonic and exhibit a sharp break near the percolation threshold. An analysis of the field dependences of the TKE and magnetization curves revealed that structural changes associated with ordering in annealed FePt films occur only in nanocomposites with fairly large grains.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
D. N. Lambeth, E. M. T. Velu, G. N. Bellesis, L. L. Lee, and D. E. Lauglin, J. Appl. Phys. 79(8), 4496 (1996).
O. A. Ivanov, L. V. Solina, V. A. Demshina, and L. M. Magat, Phys. Met. Metalloved. 35, 81 (1973).
K. Inomata, T. Sawa, and A. Hashimoto, J. Appl. Phys. 64, 2537 (1988).
K. Watanabe and H. Masumoto, Trans. Jpn. Inst. Met. 26, 3612 (1985).
S. Sun, C. B. Murray, D. Weller, L. Folks, and A. Moser, Science 287, 1989 (2000).
A. Cebollada, D. Weller, J. Sticht, G. R. Harp, R. F. C. Farrow, R. F. Marks, R. Savoy, and J. C. Scott, Phys. Rev. B 50, 3419 (1994).
I. L. Lyubchanskii, N. N. Dadoenkova, M. I. Lyubchanshkii, E. A. Shapovalov, and Th. Rasing, J. Phys. D: Appl. Phys. 36, R277 (2003).
M. Inoue and T. Fujii, J. Appl. Phys. 81, 5659 (1997).
H. Kato and M. Inoue, J. Appl. Phys. 91, 7017 (2002).
E. Gan’shina, A. Granovsky, V. Gushin, M. Kuzmishev, P. Podrugin, A. Kravetz, and E. Shipil, Physica A 241, 45 (1997).
E. Gan’shina, R. Kumaritova, A. Bogorodisky, M. Kuzmishev, and S. Ohnuma, J. Magn. Soc. Jpn. 23, 379 (1999).
A. B. Granovsky, E. A. Gan’shina, A. N. Vinogradov, I. K. Rodin, A. N. Yurasov, and H. R. Khan, Phys. Met. Metallogr. 91(Suppl. 1), S52 (2001).
V. G. Kravets, A. K. Petford-Long, and A. F. Kravets, J. Appl. Phys. 4, 87 (2000).
E. A. Gan’shina, M. V. Vashuk, A. N. Vinogradov, A. B. Granovsky, V. S. Gushchin, P. N. Shcherbak, Yu. E. Kalinin, A. V. Sitnikov, Ch.-O. Kim, and Ch. G. Kim, Zh. Éksp. Teor. Fiz. 125(5), 1172 (2004) [JETP 98 (5), 1027 (2004)].
D. A. G. Bruggeman, Ann. Phys. (Leipzig) 24, 636 (1935).
A. Akinaga, M. Mizuguchi, T. Manado, E. Ganshina, A. Granovsky, I. Rodin, A. Vinogradov, and A. Yurasov, J. Magn. Magn. Mater. 242–245, 470 (2002).
C. P. Luo and D. J. Sellmyer, J. Appl. Phys. 75, 3162 (1999).
R. A. Ristau, K. Barmak, L. H. Lewis, K. R. Coffey, and J. K. Howard, J. Appl. Phys. 86, 4527 (1999).
T. Saito, O. Kitakami, and Y. Shimada, J. Magn. Magn. Mater. 239, 310 (2002).
Author information
Authors and Affiliations
Additional information
__________
Translated from Fizika Tverdogo Tela, Vol. 47, No. 9, 2005, pp. 1638–1643.
Original Russian Text Copyright © 2005 by Gan’shina, Kochneva, Vashuk, Shcherbak, Aimuta, Inoue.
Rights and permissions
About this article
Cite this article
Gan’shina, E.A., Kochneva, M.Y., Vashuk, M.V. et al. Optical and magnetooptical properties of FePt-SiO2 magnetic nanocomposites. Phys. Solid State 47, 1701–1706 (2005). https://doi.org/10.1134/1.2045355
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1134/1.2045355