Spin-1 Model of Noninteracting Nanoparticles

• Authors: O. Yalçin , R. Erdem , S. Övűnç
• Languages of publication: EN

Abstracts

EN

In this work, we presented a spin-1 model to investigate the magnetic properties of noninteracting monodomain nanoparticles based on the pair approximation. Nearest-neighbor pair interactions are incorporated between the Ising spins in three parts that are core, core-surface, and surface within the nanoparticle. Using the spin-1 Ising model of magnetization in the pair approximation, we calculated the free energy and minimized with respect to pair variables to obtain the field-cooled magnetization. Hysteresis loops of the system were plotted for various values of exchange coupling constants, and axial anisotropy of strength which couples the core, core-surface, and surface regions. The coercive field and its linear fit to the data were plotted as a function of radius of ferromagnetic nanoparticles.

Keywords

EN

75.50.Tt; 75.60.-d; 05.50.+q; 05.70.Ln

Discipline

• 75.60.-d: Domain effects, magnetization curves, and hysteresis(for dynamics of domain structures, see 75.78.Fg)
• 75.50.Tt: Fine-particle systems; nanocrystalline materials
• 05.50.+q: Lattice theory and statistics (Ising, Potts, etc.)(see also 64.60.Cn Order-disorder transformations, and 75.10.Hk Classical spin models)
• 05.70.Ln: Nonequilibrium and irreversible thermodynamics(see also 82.40.Bj Oscillations, chaos, and bifurcations in physical chemistry and chemical physics)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2008
• Volume: 114
• Issue: 4
• Pages: 835-844

Dates

published

2008-10

received

2007-12-24

(unknown)

2008-06-06

Contributors

author

O. Yalçin

• Department of Physics, Bozok University, 66500, Yozgat, Turkey

author

R. Erdem

• Department of Physics, Gaziosmanpasa University, 60250, Tokat, Turkey

author

S. Övűnç

• Decosel, Keresteciler Sitesi 12, Block No. 1, Ikitelli-Istanbul, Turkey

References

• 1. L.G. Rego, W. Figueiredo, Phys. Rev. B 64, 44424-1 (2001)
• 2. V.S. Leite, W. Figueiredo, Brazilian J. Phys. 34, 452 (2004)
• 3. A.A. Fraerman, S.A. Gusev, I.M. Nefedov, Y.N. Nozdrin, I.R. Karetnikova, L.A. Mazo, M.V. Sapozhnikov, I.A. Shereshevsky, L.V. Suhodoev, J. Phys., Condens. Matter 13, 683 (2001)
• 4. Q.A. Pankhurst, J. Connolly, S.K. Jones, J. Dobson, J. Phys. D, Appl. Phys. 36, R167 (2003)
• 5. E.C. Stoner, E.P. Wohlfarth, Philos. Trans. R. Soc. Lond. Ser. A 240, 599 (1948);reprinted by IEEE Trans. Magn. 27, 3475 (1991)
• 6. V. Babin, P. Garstecki, R. Holyst, J. Appl. Phys. 94, 4244 (2003)
• 7. M.G. del Muro, X. Batlle, A. Labarta, Phys. Rev. B 59, 13584 (1999)
• 8. A. Szlaferek, Phys. Status Solidi B 241, 1312 (2004)
• 9. W. Werndorfer, D. Mailly, A. Benoit, J. Appl. Phys. 87, 5094 (2000)
• 10. P. Vargas, D. Altbir, M. Knobel, D. Laroze, Europhys. Lett. 58, 603 (2002)
• 11. R.H. Kodama, A.E. Berkowitz, Phys. Rev. B 59, 6321 (1999)
• 12. R.H. Kodama, A.E. Berkowitz, E.J. McNiff, Jr., S. Foner, Phys. Rev. Lett. 77, 394 (1996)
• 13. A.F. Bakuzis, P.C. Morais, J. Magn. Magn. Mater. 272-276, e1161 (2004)
• 14. W. Wernsdorfer, K. Hasselbach, D. Mailly, B. Barbara, A. Benoit, L. Thomas, G. Suran, J. Magn. Magn. Mater. 145, 33 (1995)
• 15. N.A. Usov, S.A. Gudoshnikov, J. Magn. Magn. Mater. 290-291, 727 (2005)
• 16. M. Keskin, P.H.E. Meijer, J. Chem. Phys. 85, 7324 (1986)
• 17. M. Keskin, A. Erdinç, Tr. J. Phys. 19, 88 (1995)
• 18. A. Erdinç, M. Keskin, Physica A 307, 453 (2002)
• 19. R. Kikuchi, J. Chem. Phys. 60, 1071 (1974)
• 20. R. Kikuchi, Crystals Statistics, Hughes Research Lab. Malibu, CA 1979, unpublished results
• 21. R.H. Kodama, J. Magn. Magn. Mater. 200, 359 (2005)
• 22. V.S. Leite, W. Figueiredo, Physica A 350, 379 (2005)
• 23. T. Kaneyoshi, Phys. Status Solidi B 242, 2938 (2005)

Identifiers

DOI

10.12693/APhysPolA.114.835