CHINESE JOURNAL OF PHYSICS VOL. 40, NO. 1 FEBRUARY 2002

Phase Transitions for the Random Transverse Spin 1/2 Ising Film

Hamid Ez-Zahraouy¹ and Ahmed Kassou-Ou-Ali<sup>2

1</sup>Faculté des Sciences, Département de Physique,
Laboratoire de Magnétisme et Physique des Hautes Energies,

B.P. 1014, Rabat, Morocco.

²Faculte des Sciences, Departement de Physique, Laboratoire de Physique Theorique,

B.P. 1014, Rabat, Morocco.
(Received July 25, 2001)

The effect of a random transverse field on the phase transitions of a ferromagnetic spin 1/2 Ising film is investigated within a finite cluster approximation with an expansion technique for the cluster identities of spin 1/2 systems. The phase diagrams are determined as a function of the transverse field for different values of the concentration p of the disorder of the latter. It is found that at very low temperatures the ferromagnetic order is destroyed under the effect of the transverse field only if the concentration is larger than a critical value p_c, which is independent of the film thickness.

PACS. 75.70.-i - Magnetic films and multilayers.

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