CHINESE JOURNAL OF PHYSICS VOL. 38, NO. 2-I APRIL 2000

Thermal Relaxation of Interacting Magnetic Fine Particles

Jing Ju Lu and Huei Li Huang

Department of Physics, National Taiwan University, Taipei, Taiwan 106, R.O.C.
(Received January 26, 2000)

Blocking temperature (T_B) of a fine particle system is found to vary with external field H, dipole interaction and magnetic configuration of the system. The T_B distribution curve evaluated at $H\simeq 0$ agrees well with the weighted volume distribution of the system and only the field-cooled magnetization (M_FC) alone is relevant. The behavior of M_FC and M_ZFC curves depends sensitively on H compared to dipole interaction. Both T_B and the volume distribution of the system can be deduced directly if M_FC variation with temperature is measured.

PACS. 75.50.Tt - Fine-particle systems.
PACS. 76.60.Es - Relaxation effects.
PACS. 75.60.Nt - Magnetic annealing and temperature-hysteresis effects.

Full Text | Next Article | Last Article | Contents | CJP mainpage