Abstract
The magnetic relaxation of a system of single-domain ferromagnetic particles in the presence of a strong static magnetic field directed at an arbitrary angle relative to the particle anisotropy axis is investigated. A system of linear difference-differential equations for the moments (averaged spherical harmonics) is derived without recourse to the Fokker-Planck equation by averaging Gilbert’s equations with a fluctuating field. An exact solution (in terms of matrix continuous fractions) is found for this system. The relaxation times and spectra of the complex magnetic susceptibility are calculated.
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References
L. Néel, Ann. Geophys. (C.N.R.S.) 5, 99 (1949).
W. F. Brown, Jr., IEEE Trans. Magn. 15, 1196 (1979).
H. B. Braun and H. N. Bertram, J. Appl. Phys. 75, 4609 (1994).
C. P. Bean and J. D. Livingston, J. Appl. Phys. 30, 1205 (1959).
L. D. Landau and E. M. Lifshitz, Phys. Z. Sowjetunion 8, 153 (1935).
T. L. Gilbert, Phys. Rev. 100, 1243 (1956) [Abstract only; full report, Armour Research Foundation Project, A059, Supplementary Report, May 1, 1956].
W. F. Brown, Jr., Phys. Rev. 130, 1677 (1963); J. Appl. Phys. 30, 130S (1959).
M. C. Wang and G. E. Uhlenbeck, Rev. Mod. Phys. 17, 323 (1945).
R. L. Stratonovich, Conditional Markov Processes and Their Application to the Theory of Optimal Control (Elsevier, New York, 1968).
A. Aharoni, Phys. Rev. 177, 763 (1969).
E. C. Stoner and E. P. Wohlfahrt, Philos. Trans. R. Soc. London, Ser. A 240, 599 (1948).
Yu. L. Raikher and M. I. Shliomis, Zh. Éksp. Teor. Fiz. 67, 1060 (1974) [Sov. Phys. JETP 40, 526 (1975)].
R. S. Gekht, V. A. Ignatchenko, Yu. L. Raikher, and M. I. Shliomis, Zh. Éksp. Teor. Fiz. 70, 1300 (1974) [Sov. Phys. JETP 43, 677 (1974)].
D. A. Garanin, V. V. Ishchenko, and L. V. Panina, Teor. Mat. Fiz. 82, 242 (1990).
W. T. Coffey, D. S. F. Crothers, Yu. P. Kalmykov, and J. T. Waldron, Phys. Rev. B 51, 15 947 (1995).
W. T. Coffey, P. J. Cregg, and Yu. P. Kalmykov, in Advances in Chemical Physics, Vol. 83, edited by I. Prigogine and S. A. Rice (Wiley, New York, 1994), pp. 263–464.
Yu. L. Raikher and M. I. Shliomis, in Advances in Chemical Physics, Vol. 87, edited by W. T. Coffey; series edited by I. Prigogine and S. A. Rice (Wiley, New York, 1994), p. 595.
Yu. L. Raikher and V. I. Stepanov, Zh. Éksp. Teor. Fiz. 102, 1409 (1992) [Sov. Phys. JETP 75, 764 (1992)].
M. I. Shliomis and V. I. Stepanov, in Advances in Chemical Physics, Vol. 87, edited by W. T. Coffey; series edited by I. Prigogine and S. A. Rice (Wiley, New York, 1994), p. 1.
É. K. Sadykov and A. G. Isavnin, Fiz. Tverd. Tela (St. Petersburg) 38, 2104 (1996) [Phys. Solid State 38, 1160 (1996)].
D. A. Garanin, Phys. Rev. E 54, 3250 (1996).
Yu. P. Kalmykov and W. T. Coffey, Phys. Rev. B 56, 3325 (1997).
H. Pfeiffer, Phys. Status Solidi B 118, 295 (1990).
H. Pfeiffer, Phys. Status Solidi B 122, 377 (1990).
W. T. Coffey, D. S. F. Crothers, J. L. Dorman, L. J. Geoghegan, Yu. P. Kalmykov, J. T. Waldron, and W. W. Wickstead, Phys. Rev. B 52, 15 951 (1995).
W. T. Coffey, D. S. F. Crothers, J. L. Dorman, L. J. Geoghegan, and E. C. Kennedy, Phys. Rev. B (in press).
Yu. P. Kalmykov, J. Mol. Liq. 69, 117 (1996).
W. T. Coffey, Yu. P. Kalmykov, and J. T. Waldron, The Langevin Equation (World Scientific, Singapore, 1996).
H. Risken, The Fokker-Planck Equation (Springer-Verlag, Berlin, 1989).
W. T. Coffey, J.-L. Déjardin, Yu. P. Kalmykov, and S. V. Titov, Phys. Rev. E 54, 6462 (1996).
J.-L. Déjardin, P.-M. Déjardin, and Yu. P. Kalmykov, J. Chem. Phys. 107, 508 (1997).
I. Klik and L. Gunther, J. Stat. Phys. 60, 473 (1990).
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Fiz. Tverd. Tela (St. Petersburg) 40, 1642–1649 (September 1998)
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Kalmykov, Y.P., Titov, S.V. Complex magnetic susceptibility of uniaxial superparamagnetic particles in a strong static magnetic field. Phys. Solid State 40, 1492–1499 (1998). https://doi.org/10.1134/1.1130584
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DOI: https://doi.org/10.1134/1.1130584