Superspin Glass Mediated Giant Spontaneous Exchange Bias in a Nanocomposite of BiFeO${}_3$-Bi${}_2$Fe${}_4$O${}_9$

Tuhin Maity, Sudipta Goswami, Dipten Bhattacharya +1

We observe an enormous $\text{spontaneous}$ exchange bias ($\sim$300-600 Oe) - measured in an unmagnetized state following zero-field cooling - in a nanocomposite of BiFeO${}_3$ ($…