After the prediction of the giant electroresistance effect,much work has been carried out to find this effect in practical devices.We demonstrate a novel way to obtain a large electroresistance(ER)effect in the multil...After the prediction of the giant electroresistance effect,much work has been carried out to find this effect in practical devices.We demonstrate a novel way to obtain a large electroresistance(ER)effect in the multilayer system at room temperature.The current-in-plane(CIP)electric transport measurement is performed on the multilayer structure consisting of(011)-Pb(Mg_(1/3)Nb_(2/3))O_(3)−PbTiO_(3)(PMN−PT)/Ta/Al-O/metal.It is found that the resistance of the top metallic layer shows a hysteretic behavior as a function electric field,which corresponds well with the substrate polarization versus electric field(P–E)loop.This reversible hysteretic R–E behavior is independent of the applied magnetic field as well as the magnetic structure of the top metallic layer and keeps its memory state.This novel memory effect is attributed to the polarization reversal induced electrostatic potential,which is felt throughout the multilayer stack and is enhanced by the dielectric Al-O layer producing unique hysteretic,reversible,and reproducible resistance switching behavior.This novel universal electroresistance effect will open a new gateway to the development of future multiferroic memory devices operating at room temperature.展开更多
Structural and magnetic properties of Tb(Fe_(1-x)Ni_(x))_(11.3)Nb_(0.7) compounds have been investigated.The x-ray diffraction patterns show that all compounds crystallize in the ThMn12-type structure and that all sam...Structural and magnetic properties of Tb(Fe_(1-x)Ni_(x))_(11.3)Nb_(0.7) compounds have been investigated.The x-ray diffraction patterns show that all compounds crystallize in the ThMn12-type structure and that all samples are almost of single phase.The lattice constants monotonously decrease with increasing Ni content.The Curie temperature Tc clearly increases and the saturation moment Ms monotonously decreases with increasing Ni content.X-ray diffraction patterns of aligned samples at room temperature show that for x≤0.2 the easy magnetization direction is in the plane while for the x=0.25 compound the easy magnetization direction is along the c-axis.In the compounds with x≤0.20 spin reorientation occurs above room temperature whereas in the compounds with x>0.2 there is a spin reorientation below room temperature.It has been found that Ni contributes positively to the T-sublattice moment MT.展开更多
基金Supported by the National Basic Research Program of China under Grant No.2010CB934400the National Natural Science Foundation of China under Grant Nos.10934099,10874225,and 51021061K.C.Wong Education Foundation,Hong Kong,US-NSF,and Higher Education Commission(HEC)of Pakistan.
文摘After the prediction of the giant electroresistance effect,much work has been carried out to find this effect in practical devices.We demonstrate a novel way to obtain a large electroresistance(ER)effect in the multilayer system at room temperature.The current-in-plane(CIP)electric transport measurement is performed on the multilayer structure consisting of(011)-Pb(Mg_(1/3)Nb_(2/3))O_(3)−PbTiO_(3)(PMN−PT)/Ta/Al-O/metal.It is found that the resistance of the top metallic layer shows a hysteretic behavior as a function electric field,which corresponds well with the substrate polarization versus electric field(P–E)loop.This reversible hysteretic R–E behavior is independent of the applied magnetic field as well as the magnetic structure of the top metallic layer and keeps its memory state.This novel memory effect is attributed to the polarization reversal induced electrostatic potential,which is felt throughout the multilayer stack and is enhanced by the dielectric Al-O layer producing unique hysteretic,reversible,and reproducible resistance switching behavior.This novel universal electroresistance effect will open a new gateway to the development of future multiferroic memory devices operating at room temperature.
基金Supported by the Scientific Research Foundation for Returned Overseas Chinese Scholars,State Education Commission。
文摘Structural and magnetic properties of Tb(Fe_(1-x)Ni_(x))_(11.3)Nb_(0.7) compounds have been investigated.The x-ray diffraction patterns show that all compounds crystallize in the ThMn12-type structure and that all samples are almost of single phase.The lattice constants monotonously decrease with increasing Ni content.The Curie temperature Tc clearly increases and the saturation moment Ms monotonously decreases with increasing Ni content.X-ray diffraction patterns of aligned samples at room temperature show that for x≤0.2 the easy magnetization direction is in the plane while for the x=0.25 compound the easy magnetization direction is along the c-axis.In the compounds with x≤0.20 spin reorientation occurs above room temperature whereas in the compounds with x>0.2 there is a spin reorientation below room temperature.It has been found that Ni contributes positively to the T-sublattice moment MT.
