Magnetic properties and phonon behavior of Pr2NiMnO6 thin films

We report on the magnetic properties and the phonon behavior of epitaxial Pr2NiMnO6 (PNMO) films. The temperature dependence of their magnetic properties shows a ferromagnetic behavior up to 214 K owing to a dominant Ni2+/Mn4+ ordering. The observation of a secondary low-temperature magnetic transition around 126 K indicates that a small proportion of Ni/Mn disordered lattice remains in our films. Unlike La2NiMnO6, the temperature dependence of the 651 cm−1 Raman active phonon of our films reflects the presence of a weak spin–phonon coupling in PNMO.