Epitaxial Growth of Gd0.67 Ca0. 33 MnO3 Thin Films by Laser Ablation

Gd0. 67Ca0. 33MNO3 (GCMO)thin films grown by laser ablation on SrTiO3 (100) (STO)substrates was studied. Films are highly crystallized, very well epitaxial and single-phased. The ordering magnetic temperature (Te)of the films is much higher than the value of bulk samples of similar composition. It is found that the GCMO film exhibits a reversal of its magnetization at low temperature when cooled under a magnetic field. The negative magnetization is a consequence of the rapid increase(～1/T) with decreasing temperature of the magnetization of a sublattice aligned antiparallel to the local field, relative to the magnetic izontribution of a second sublattice which is aligned parallel to the applied field.

Epitaxial Growth of Gd0.67Ca0.33MnO3 Thin Films by Laser Ablation

Gd0.67Ca0.33MnO3(GCMO)thin films grown by laser ablation on SrTiO3(100)(STO)substrates was studied. Films are highly crystallized, very well epitaxial and single-phased. The ordering magnetic temperature(Tc)of the films is much higher than the value of bulk samples of similar composition. It is found that the GCMO film exhibits a reversal of its magnetization at low temperature when cooled under a magnetic field. The negative magnetization is a consequence of the rapid increase(～1/T)with decreasing temperature of the magnetization of a sublattice aligned antiparallel to the local field, relative to the magnetic contribution of a second sublattice which is aligned parallel to the applied field.