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Magnetic properties of Ni2+ clusters in NaY zeolite

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3 Author(s)
Mukadam, M.D. ; Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India ; Yusuf, S.M. ; Sasikala, R.

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We have investigated the magnetic properties of Ni2+ exchanged NaY zeolite by using a direct current magnetization technique. At T≫5 K, the M vs H/T curves superimpose and these curves could be fitted well using a Langevin function with a log-normal distribution of moments. The mean spin-cluster moment has been found to be ∼3.3μB. The deviation from the superposition of the M vs H/T curves is observed at T≪5 K indicating the building up of a spin-spin correlation between Ni clusters below 5 K. The zero-field-cooled and field-cooled magnetization curves show branching at low temperatures (T≤5 K) under low applied magnetic fields (H≤1 kOe) with a peak in the zero-field-cooled magnetization curves. A log-normal distribution of spin-freezing/blocking temperature has been observed with mean spin-freezing/blocking temperature ∼3.0 K. The peak temperature Tg decreases with increasing field and follows the de Almeida–Thouless (AT) line [1-Tg(H)/Tg(0)]∝H2/3. The extrapolation of the AT line gives the spin-freezing temperature Tg(0)≈3.29 K.

Published in:

Journal of Applied Physics  (Volume:102 ,  Issue: 10 )

Date of Publication:

Nov 2007

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