Direct observation of magnetic phase coexistence and magnetization   reversal in a Gd$_{0.67}$Ca$_{0.33}$MnO$_{3}$ thin film
  We have investigated the ferrimagnetic domain structure in a Gd$_{0.67}$Ca$_{0.33}$MnO$_{3}$ thin film using magnetic force microscopy. We observe clear signs of phase separation, with magnetic islands embedded in a non-magnetic matrix. We also directly visualize the reversal of magnetization of ferrimagnetic domains as a function of temperature and attribute it to a change in the balance of magnetization of anti-aligned Mn and Gd sublattices. 
Jeehoon Kim, N. Haberkorn, Leonardo Civale, Evgeny Nazaretski, Paul   Dowden, Avadh Saxena, J. D. Thompson, and Roman Movshovich
cond-mat.str-el