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Abstract:
The authors have investigated the ground state magnetic phase and the
optical band gap of chemically synthesized Zn0.85Fe0.15O diluted
magnetic semiconducting nanoparticles (similar to 7.5 nm). The
temperature dependent magnetization study shows strong irreversibility
along with a cusplike anomaly, which is ascribed to a freezing to a
cluster glasslike magnetic ground state. This assignment is further
established by Arrott-Belov-Kouvel plots along with S-like
nonsaturating magnetization versus field curves. The finite size
ferromagnetic clusters which are formed due to an enhanced grain
surface effect in the system undergo random dipolar intercluster
interactions, giving rise to strong competitive ferromagnetic and
antiferromagnetic interactions, finally leading to the freezing of
those clusters.
