Issue 3, 1993

Spin–glass behaviour of the system CoFe2–xGaxO4

Abstract

X-Ray, transport, infrared, magnetic hysteresis, a.c. susceptibility and Mössbauer studies have been carried out for the system CoFe2O4–CoGa2O4. X-Ray and transport measurements indicate cubic symmetry and p-type semiconductivity, respectively, for the compositions with 0.0⩽x⩽2.0. Hysteresis studies demonstrated the presence of ferrimagnetism in compositions with x⩽1.5, while the compound CoGa2O4(x= 2.0) showed antiferromagnetic behaviour. A.c. susceptibility (χac) measurements indicate that the compositions with X= 0.25 and 0.50 undergo ferrimagnetic transitions at TN and on further cooling enter a cluster spin–glass state (Tsg) with the magnetisation of different clusters being randomly frozen. The Mössbauer spectrum at room temperature for the composition with x= 1.0 showed a relaxation pattern, while at 77 K a magnetically split six-line hyperfine spectrum coexists with a paramagnetic line at the centre.

Article information

Article type
Paper

J. Mater. Chem., 1993,3, 299-302

Spin–glass behaviour of the system CoFe2–xGaxO4

U. Bhattacharya and V. S. Darshane, J. Mater. Chem., 1993, 3, 299 DOI: 10.1039/JM9930300299

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