Fig. 3: PFM characterization of bulk γ-BaFe2O4 samples.
From: γ-BaFe2O4: a fresh playground for room temperature multiferroicity
Topography (a), lateral PFM (b, c), and vertical PFM (d, e) images. b, d These show the amplitude of the PFM signals. c, e These show the phase of the PFM signals. Local piezoresponse hysteresis loops: amplitude (f) and phase (g). Black and red curves correspond to the first and the second switching cycles respectively.
