Current switching of resistive states in magnetoresistive manganites

Electric field driven dynamic percolation in electronically phase separated (La0.4Pr0.6)Jeen1, Biswas2 2013Phys. Rev. B321310View full textAdd to dashboardCite

“…3(c) and 3(d) show the dependence of the R − t curves on V A . In both directions t BD reduces with higher V A which is consistent with a dynamic percolation scenario [9,13,29]. This voltage dependent resistance breakdown is similar to the electric field driven dynamic percolation of conducting particles suspended in nonconducting polymers [30,31].…”

“…The R − t behavior described above can be explained if there is a collective rearrangement of the FMM phase in an electric field [9,16,29]. Such models explain the resistivity drop without a concomitant increase in magnetization (FMM volume fraction), as shown in Fig.…”

“…An alternate route for controlling the magnetism with an electric field is offered in materials with centrosymmetric structures such as perovskite-type manganese oxides (manganites), where the ferromagnetic metallic phase is in competition with a non-ferromagnetic insulating phase close to a first order phase transition [4][5][6]. In the prototypical manganite (La 1−y Pr y ) 1−x Ca x MnO 3 , the competition among the ferromagnetic metallic (FMM), charge-ordered insulating (COI), paramagnetic insulating (PMI) phases leads to multiphase coexistence over a broad range of temperatures [4,7] and makes it possible to tune their properties using external parameters such as magnetic field, electric field, and strain [8][9][10][11].…”

Field-enhanced bulk conductivity and resistive-switching in Ca-doped BiFeO3 ceramics

“…We conclude, therefore, that oxide ion conduction (or oxide vacancy conduction), if it occurs at all, is not the main driver for the observed conductivity changes. 7 From the results presented above, the conductivity is non-ohmic in the sense that the carrier concentration must be bias-dependent. In general, conduction in bulk materials is ohmic at low fields but may become non-ohmic at high fields if carrier injection from the electrode occurs [16].…”

Conservation of angular momentum and the inverse Faraday effect

“…However, due to the difficulty of creating ultrashort magnetic pulses and the recent discovery that magnetic switching by strong magnetic fields can be unpredictable, 1 alternative techniques of controlling magnetization are under intense investigation. [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Optical methods [2][3][4][5][6][7][8][9][10][11][12][13] are particularly promising due to the availability of ultrashort laser pulses. However, the fundamental mechanisms of optically induced demagnetization and magnetic switching are not fully understood.…”