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Sign reversal of anisotropic magnetoresistance in La0.7Ca0.3MnO3/SrTiO3 ultrathin films
Ist Teil von
Applied physics letters, 2014-12, Vol.105 (22)
Ort / Verlag
Melville: American Institute of Physics
Erscheinungsjahr
2014
Quelle
AIP Journals Complete
Beschreibungen/Notizen
We present the observation of strain induced sign reversal of anisotropic magnetoresistance (AMR) in La0.7Ca0.3MnO3 (LCMO) ultrathin films (thickness ∼ 4 nm) deposited on SrTiO3 (001) substrate (STO). We have also observed unusually large AMR (∼24%) in LCMO/STO thin films with thickness of 6 nm below but close to its Curie temperature (TC) which decreases as the film thickness increases. The sign reversal of AMR (with a maximum value of −6%) with magnetic field or temperature for the 4 nm thin film may be attributed to the increase in tensile strain in the plane of the thin film which in turn facilitates the rotation of the magnetization easy axis.