Planar Nernst and Hall effect in patterned ultrathin film of La0.7Sr0.3MnO3

We present the observation of transverse thermopower, or planar Nernst Effect (PNE), and planar Hall Effect (PHE) in patterned ultrathin film (∼8 nm) of La0.7Sr0.3MnO3 (LSMO). For PNE, a heat current was applied in-plane of the film (by creating a temperature gradient ∇T) whereas an in-plane current of 100 μA was applied for measuring PHE. Even for a temperature difference of ΔT = 5 K the planar Nernst effect in LCMO ultrathin film (∼8 nm) shows a coercivity of ∼3 Oe and confirms the ferromagnetic nature of the thin film. The angular dependence of transverse voltage in PNE shows a four-fold sinθ cosθ dependence symmetry at 250 K, which is consistent with the planar Hall effect measurement.