P. Levy

Mechanism for bipolar resistive switching in transition metal oxides

We introduce a model that accounts for the bipolar resistive switching phenomenon observed in transition-metal oxides. It qualitatively describes the electric-field-enhanced migration of oxygen vacancies at the nanoscale. The numerical study of the model predicts that strong electric fields develop in the highly resistive dielectric-electrode interfaces leading to spatially inhomogeneous oxygen vacancies distribution and a concomitant resistive switching effect. The theoretical results qualitatively reproduce nontrivial resistance hysteresis experiments that we also report providing key validation to our model.

Magnetization studies of phase separation in La 0.5 Ca 0.5 MnO 3

We present magnetization studies in a series of phase-separated

Nonvolatile magnetoresistive memory in phase separated La0.325Pr0.300Ca0.375MnO3

{\mathrm{La}}_{0.5}{\mathrm{Ca}}_{0.5}{\mathrm{MnO}}_{3}

Hysteresis switching loops in Ag-manganite memristive interfaces

manganite samples, with different low-temperature fractions of the ferromagnetic (FM) and charge-ordered antiferromagnetic phases. A particular experimental procedure probes the effect of the magnetic field applied while cooling the samples, which promotes FM fraction enlargement and enhances the melting of the charge-ordered phase. The response of the system depending on its magnetic field history indicates the existence of three different regimes in the phase-separated state which develops below

Magnetoresistance induced by low-field control of phase separation in La 0.5 Ca 0.5 MnO 3

{T}_{C}.

Modeling of the Hysteretic

Our data allow us to identify the onset temperature below which the system becomes magnetic and structurally phase separated and an onset field above which FM fraction enlargement occurs.

I{-}V

We have measured magnetic and transport response on the polycrystalline La

Characteristics of

_{5/8-y}

{\rm TiO}_{2}

Pr

-Based Resistive Switches Using the Generalized Diode Equation

_y