Direct measurement of ferromagnetic ordering in biaxially strained LaCoO3 thin films

Klie, R. F.; Yuan, T.; Tanase, M.; Yang, G.; Ramasse, Q.
February 2010
Applied Physics Letters;Feb2010, Vol. 96 Issue 8, p082510
Academic Journal
LaCoO3 undergoes a transition from a nonmagnetic to a paramagnetic semiconductor at 80 K, associated with a spin-state transition of the Co3+ ions. It was proposed that the temperature of the spin-state transition depends strongly on the LaCoO3 lattice parameter, suggesting that strain can stabilize different spin states at different temperatures. By combining atomic-resolution Z-contrast imaging, electron diffraction, and angular-resolved electron energy-loss spectroscopy (EELS) with in situ cooling experiments, we show that epitaxially strained LaCoO3 (001) thin films grown on LaAlO3 (001) do not undergo a low temperature spin-state transition. Our EELS study explores the origins of the ferromagnetic ordering in strained LaCoO3 films.


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