Observation of magnetization reversal in epitaxial Gd0.67Ca0.33MnO3 thin films

Abstract

High quality epitaxial thin films of Gd0.67Ca0.33MnO3 have been deposited onto (100) SrTiO3 substrates by pulsed-laser deposition. Enhanced properties in comparison with bulk samples were observed. The magnetic transition temperature (Tc) of the as-grown films is much higher than the corresponding bulk values. Most interestingly, magnetization measurements performed under small applied fields, exhibit magnetization reversals below Tc, no matter whether the film is field-cooled (FC) or zero-field-cooled (ZFC). A rapid magnetization reversal occurs at 7 K when field cooled, while as for the ZFC process the magnetization decreases gradually with increasing temperatures, taking negative values above 7 K and changing to positive values again, above 83 K. In higher magnetic fields the magnetization does not change sign. The reversal mechanism is discussed in terms of a negative exchange f-d interaction and magnetic anisotropy, this later enhanced by strain effects induced by the lattice mismatch between the film and the substrate.

16 pages, 4 figures

References in corpus (4)

• Double Exchange Alone Does Not Explain the Resistivity of $L{a}_{1-x}S{r}_{x}Mn{O}_3$
• Effects of annealing and strain on La_{1-x}Ca_{x}MnO_{3} thin films: a new phase diagram in the ferromagnetic region
• Soft spin waves in the low temperature thermodynamics of Pr_{0.7}Ca_{0.3}MnO_{3}
• Y(Ni, Mn)O3 epitaxial thin films prepared by pulsed laser deposition

Cited by in corpus (3)

• Improved properties of epitaxial YNixMn1-xO3 films by annealing under high magnetic fields
• Experimental and theoretical demonstration of negative magnetization induced by particle size reduction in nano-form Gd${}_{1-x}$Ca${}_x$MnO${}_3$
• Direct observation of magnetic phase coexistence and magnetization reversal in a Gd${}_{0.67}$Ca${}_{0.33}$MnO${}_3$ thin film