Abstract
We present a comparative study of the temperature dependent magnetic properties and electron paramagnetic resonance parameters of nano and bulk samples of Bi0.2Sr0.8MnO3 (BSMO). Bulk BSMO is known to have a high TN ∼ 260 K and robust charge ordering (TCO ∼ 360 K). We confirm that the bulk sample shows an antiferromagnetic transition around ∼260 K and a spin-glass transition ∼40 K. For the nano sample, we see a clear ferromagnetic transition at around ∼120 K. We conclude that spin glass state, which is present due to the co-existence of antiferromagnetic and ferromagnetic states in the bulk sample, is suppressed in the nano sample and ferromagnetism is induced instead.
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