Physics – Condensed Matter
Scientific paper
1999-03-19
J. Phys.: Cond. Matter 12 (2000) 3077-3090
Physics
Condensed Matter
14 LaTex209 pages, 6 EPS figures. To appear in J. Phys.: Condensed Matter
Scientific paper
10.1088/0953-8984/12/13/316
The effect of an applied magnetic field on the temperature at the maximum of the ZFC magnetization, $M_{ZFC}$, is studied using the recently obtained analytic results of Coffey et al. (Phys. Rev. Lett. {\bf 80}(1998) 5655) for the prefactor of the N\'{e}el relaxation time which allow one to precisely calculate the prefactor in the N\'{e}el-Brown model and thus the blocking temperature as a function of the coefficients of the Taylor series expansion of the magnetocrystalline anisotropy. The present calculations indicate that even a precise determination of the prefactor in the N\'{e}el-Brown theory, which always predicts a monotonic decrease of the relaxation time with increasing field, is insufficient to explain the effect of an applied magnetic field on the temperature at the maximum of the ZFC magnetization. On the other hand, we find that the non linear field-dependence of the magnetization along with the magnetocrystalline anisotropy appears to be of crucial importance to the existence of this maximum.
Coffey W. T.
Crothers D. S. F.
Ezzir A.
Kachkachi Hamid
Kennedy E. C.
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