We hereby report the room-temperature structural and optical characterization of RECr_(0.85)Mn_(0.15)O_(3)(RECMO,RE=Ho,Gd and Pr)compounds synthesized by the auto-combustion sol-gel route.Their low temperature dielect...We hereby report the room-temperature structural and optical characterization of RECr_(0.85)Mn_(0.15)O_(3)(RECMO,RE=Ho,Gd and Pr)compounds synthesized by the auto-combustion sol-gel route.Their low temperature dielectric properties are also presented.The RECMO compounds crystallize in an orthorhombic Pbnm symmetry with an average grain size range of 51-80 nm.Structural analysis reveals an increase in the structural distortion compared to that of the undoped bulk compounds.Optical measurements exhibit a significant reduction in bandgap values for RECMO nanoparticles when compared with their undoped bulk compounds.Further,from the absorbance measurements various optical parameters such as skin depth,extinction coefficient,refractive index and optical conductivity were also calculated.The dielectric analysis confirms the lower values of the dielectric permittivity and dielectric loss than those of their corresponding bulk compounds.AC conductivity versus frequency and temperature data are fitted according to the Jonscher's power law and Arrhenius law,respectively.The small polaron hopping is responsible for the electric conduction in these compounds.The tunability of the optical and dielectric properties as a result of substitution and particle size reduction makes these materials useful for various potential applications in photocatalysis,optoelectronics and low permittivity dielectrics.展开更多
In modern technology,recent advances in multi-functional devices are rapidly developed for the diverse demands of human beings.Meanwhile,durability and adaptability to extreme environmental conditions are also require...In modern technology,recent advances in multi-functional devices are rapidly developed for the diverse demands of human beings.Meanwhile,durability and adaptability to extreme environmental conditions are also required.In this study,a flexible magnetoelectric(ME)heterostructure based on CoFe_(2)O_(4)/Pb(Zr,Ti)O_(3)composite thin film on muscovite is presented,with two geometries of the constituents,namely laminar heterostructure,and vertical nanostructure,adopted for the comparison.On the other hand,credited to the mechanical flexibility of muscovite,the impact of flexibility on ME properties is also discussed with a series of bending tests.Moreover,the ME response sustains for 10,000 times bending without significant decrease,validating the mechanical durability of this heterostructure on muscovite.With these advantages,a flexible proximity sensor based on this heterostructure is demonstrated for motion detection.It is expected to offer a pathway for creating the next-generational flexible devices,showing potential for future practical application.展开更多
Recent advances in the design and development of magnetic storage devices have led to an enormous interest in materials with perpendicular magnetic anisotropy(PMA)property.The past decade has witnessed a huge growth i...Recent advances in the design and development of magnetic storage devices have led to an enormous interest in materials with perpendicular magnetic anisotropy(PMA)property.The past decade has witnessed a huge growth in the development of flexible devices such as displays,circuit boards,batteries,memories,etc.since they have gradually made an impact on people’s lives.Thus,the integration of PMA materials with flexible substrates can benefit the development of flexible magnetic devices.In this study,we developed a heteroepitaxy of BaFe_(12)O_(19)(BaM)/muscovite which displays both mechanical flexibility and PMA property.The particular PMA property was characterized by vibrating sample magnetometer,magnetic force microscopy,and x-ray absorption spectroscopy.To quantify the PMA property of the system,the intrinsic magnetic anisotropy energy density of~2.83 Merg cm−3 was obtained.Furthermore,the heterostructure exhibits robust PMA property against severe mechanical bending.The findings of this study on the BaM/muscovite heteroepitaxy have several important implications for research in next-generation flexible magnetic recording devices and actuators.展开更多
基金Project supported by the Science and Engineering Research Board(SERB)New Delhi,India(ECR/2017/002681)Inter University Accelerator Centre,New Delhi,India(UFR-62317)。
文摘We hereby report the room-temperature structural and optical characterization of RECr_(0.85)Mn_(0.15)O_(3)(RECMO,RE=Ho,Gd and Pr)compounds synthesized by the auto-combustion sol-gel route.Their low temperature dielectric properties are also presented.The RECMO compounds crystallize in an orthorhombic Pbnm symmetry with an average grain size range of 51-80 nm.Structural analysis reveals an increase in the structural distortion compared to that of the undoped bulk compounds.Optical measurements exhibit a significant reduction in bandgap values for RECMO nanoparticles when compared with their undoped bulk compounds.Further,from the absorbance measurements various optical parameters such as skin depth,extinction coefficient,refractive index and optical conductivity were also calculated.The dielectric analysis confirms the lower values of the dielectric permittivity and dielectric loss than those of their corresponding bulk compounds.AC conductivity versus frequency and temperature data are fitted according to the Jonscher's power law and Arrhenius law,respectively.The small polaron hopping is responsible for the electric conduction in these compounds.The tunability of the optical and dielectric properties as a result of substitution and particle size reduction makes these materials useful for various potential applications in photocatalysis,optoelectronics and low permittivity dielectrics.
基金The Ministry of Science and Technology supports this work,Taiwan(Grant nos.MOST 110-2124-M-007-004)the Center for Emergent Functional Matter Science of National Yang Ming Chiao Tung University from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education(MOE)in Taiwan.
文摘In modern technology,recent advances in multi-functional devices are rapidly developed for the diverse demands of human beings.Meanwhile,durability and adaptability to extreme environmental conditions are also required.In this study,a flexible magnetoelectric(ME)heterostructure based on CoFe_(2)O_(4)/Pb(Zr,Ti)O_(3)composite thin film on muscovite is presented,with two geometries of the constituents,namely laminar heterostructure,and vertical nanostructure,adopted for the comparison.On the other hand,credited to the mechanical flexibility of muscovite,the impact of flexibility on ME properties is also discussed with a series of bending tests.Moreover,the ME response sustains for 10,000 times bending without significant decrease,validating the mechanical durability of this heterostructure on muscovite.With these advantages,a flexible proximity sensor based on this heterostructure is demonstrated for motion detection.It is expected to offer a pathway for creating the next-generational flexible devices,showing potential for future practical application.
基金supported by the Ministry of Science and Technology,Taiwan(grant No.MOST 110-2634-F-009-026)the Center for Emergent Functional Matter Science of National Yang Ming Chiao Tung University from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education(MOE)in Taiwan.NY and TK were supported by JSPS KAKENHI(grant Nos.JP19H05823 and JP21H04436)Rong Huang was supported by the National Natural Science Foundation of China(Grant No.61974042).
文摘Recent advances in the design and development of magnetic storage devices have led to an enormous interest in materials with perpendicular magnetic anisotropy(PMA)property.The past decade has witnessed a huge growth in the development of flexible devices such as displays,circuit boards,batteries,memories,etc.since they have gradually made an impact on people’s lives.Thus,the integration of PMA materials with flexible substrates can benefit the development of flexible magnetic devices.In this study,we developed a heteroepitaxy of BaFe_(12)O_(19)(BaM)/muscovite which displays both mechanical flexibility and PMA property.The particular PMA property was characterized by vibrating sample magnetometer,magnetic force microscopy,and x-ray absorption spectroscopy.To quantify the PMA property of the system,the intrinsic magnetic anisotropy energy density of~2.83 Merg cm−3 was obtained.Furthermore,the heterostructure exhibits robust PMA property against severe mechanical bending.The findings of this study on the BaM/muscovite heteroepitaxy have several important implications for research in next-generation flexible magnetic recording devices and actuators.
