Magnetization studies on aluminium and chromium substituted Ni–Zn ferrites

• Published in: Journal of magnetism and magnetic materials Vol. 186; no. 3; pp. 349 - 356
• Main Authors: Sankpal, A.M, Suryavanshi, S.S, Kakatkar, S.V, Tengshe, G.G, Patil, R.S, Chaudhari, N.D, Sawant, S.R
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.07.1998; Elsevier Science
• Subjects: Anisotropy constant; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Domain effects, magnetization curves, and hysteresis; Exact sciences and technology; Exchange and superexchange interactions; Exchange interaction; Ferrites; Magnetic anisotropy; Magnetic properties and materials; Magnetically ordered materials: other intrinsic properties; Magnetization; Magnetization curves, hysteresis, Barkhausen and related effects; Magnetization curves, magnetization reversal, hysteresis, barkhausen and related effects; Physics; Substitution effects; Ferrites; Anisotropy constant; Magnetization; Exchange interaction; Substitution effects; Nickel oxides; Inorganic compounds; Transition element compounds; Experimental study; Magnetic susceptibility; Zinc oxides; Ion substitution; Magnetic anisotropy; Chromium oxides; Coercive force; Iron oxides; Exchange interactions; Aluminium oxides; Remanence
• ISSN: 0304-8853
• DOI: 10.1016/S0304-8853(97)01156-6

The thermal variations of remanence ratio R and coercive field H c reveal that the compositions of Ni 0.7Zn 0.3Al x /Cr x Fe 2− x O 4 contain predominently multidomain (MD) grains. With the substitution of Al 3+/Cr 3+, the magnetic moment and R decrease. The decreasing behaviour is explained on the basis of exchange interaction and the effect of the anisotropy constant K 1. Both of these parameters decrease with the increase in the anisotropy constant K 1. The variation of n B(77 K) with Al 3+/Cr 3+ substitution suggests that canted spins occur in the system. The compositions of Ni 0.7Zn 0.3Al x /Cr x Fe 2− x O 4 ferrites were prepared by the standard ceramic process using a computer controlled furnace.