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Ferromagnetic, Ferroelectric and Optical Modulated Multiple Resistance States in Multiferroic Tunnel Junctions
摘要： In data storages, spin, ferroelectric or optical index has been utilized as the information carrier, and the binate couplings among the three parameters are explored to increase the resistance states and resultant data-density. However, studies holding all of the three information indices are still blank, where the risen number of information carriers from previous two to three provides opportunities for inducing novel phenomena and distinct resistance states. In this work, using the spin-electron-photon resolved theory, we demonstrate the feasibility of spin, ferroelectric and optical interactions, which are further detected by a spin- and ferroelectric-modulated photovoltaic effect in La2/3Sr1/3MnO3/BiFeO3/Fe4N multiferroic tunnel junctions (MFTJs). Moreover, on the basis of spin- and ferroelectric-induced four resistance states in MFTJs, the special photovoltaic effect shall split each resistance state into the light-on and light-off switching states, which finally leads to the multiple resistance states. Besides, nearly 100% spin-polarized photocurrent and large tunneling magnetoresistance (electroresistance) are realized in this MFTJs. These results reveal that interacted spin, ferroelectric and optical indices can simultaneously serve as information carriers in storages, which provide guidance for developing efficient data memories.
关键词： Photovoltaic,La2/3Sr1/3MnO3,Ferroelectric,Spin,Fe4N,BiFeO3
更新于2025-09-04 15:30:14
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Integration of sputter-deposited multiferroic CoFe2O4-BiFeO3 nanocomposites on conductive La0.7Sr0.3MnO3 electrodes
摘要： The structure, magnetic and ferroelectric properties of sputtered epitaxial CoFe2O4-BiFeO3 (CFO-BFO) nanocomposite thin films grown on La0.7Sr0.3MnO3 (LSMO) layers on (001) oriented SrTiO3 (STO) substrates and on STO-buffered Si are described. The as-grown LSMO thin films were smooth and poorly conductive but the resistivity was reduced and the surfaces roughened after annealing. Cosputtered CFO and BFO on STO formed vertically aligned nanostructures consisting of epitaxial spinel CFO pillars within a perovskite BFO matrix, but the rough surface of the annealed LSMO film promoted additional CFO pillar orientations. A reorientation of the CFO magnetic easy axis to an in-plane direction occurred as the LSMO became thicker due to changes in the strain state of the CFO pillars. The LSMO underlayer enabled the ferroelectric response of the BFO to be measured. Nanocomposites were grown onto LSMO/SrTiO3/Si which provides a path towards large scale integration of electrically contacted nanocomposites on Si.
关键词： La0.7Sr0.3MnO3,sputter-deposited,ferroelectric,magnetic properties,nanocomposites,CoFe2O4-BiFeO3,multiferroic
更新于2025-09-04 15:30:14