The non-volatile multi-level magnetic or resistance states switching is extremely promising for newgeneration high-density information storage.In this work,we propose a novel multiple-state magnetic memory based on th...The non-volatile multi-level magnetic or resistance states switching is extremely promising for newgeneration high-density information storage.In this work,we propose a novel multiple-state magnetic memory based on the magnetic deflagration in a single Laves-phase Tb_(0.95)Mn_(1.5)Co_(0.5)compound with non-volatile and multilevel magnetic states switching.In consideration of the negative magnetization,six different magnetic states are achieved by simply applying the magnetic field.The abinitio calculations and neutron diffraction measurements indicate that the studied compound is a cubic structure withferromagnetic ordering at low temperature and the evolution in magnetic states(i.e.magnetic deflagration)should arise from the Barkhausen effect.The almost unchanged magnetic state under corresponding range of magnetic field enables the magnetization to be in the same magnitude even after 50 cyclic hysteresis loops.Furthermore,the retention,repeatable switching,and non-volatile characters of multi-level magnetic state have been primely confirmed.All these suggest that the Tb_(0.95)Mn_(1.5)Co_(0.5)compound with multiple magnetic deflagrations could be applied to multiple-state magnetic memory and this work would pave the way to design a novel multi-level magnetic storage.展开更多
Photothermal conversion is one of the key technologies in solar energy collection,seawater desalination,photo thermal treatment and other important fields.In order to develop next generation photothermal materials,fou...Photothermal conversion is one of the key technologies in solar energy collection,seawater desalination,photo thermal treatment and other important fields.In order to develop next generation photothermal materials,four poly oxometalates,[(CH_(3))_(2)NH_(2)]_(12)H_(5)[Ni_(3)Mo_(18)O_(54)(HPO_(3))_(10)(PO_(4))]·_(18)H_(2)O(Compound 1),[(CH_(3))_(2)NH_(2)]_(1)Na_(11)[Ni_(2)Mo_(8)O_(22)(HPO_(3))_(10)]·16H_(2)O(Compound 2),Na_(15)(OH)_5[Mo_(6)O_(18)(HPO_(3))_(4)]_(2)[MoO]_(1.5)·16H_(2)O(Compound 3),[(CH_(3))_(2)NH_(2)]_(4)Na_(11)[Na[Mo_6O_(15)(HPO_(3))_(4)]_(2)]·_(18)H_(2)O(Compound 4),are successfully designed and synthesized via a micro wave-as sis ted reaction protocol.Compounds 1-4 not only exhibit broad absorption and notable photothermal conversion effects in near-infrared(NIR)region,but also have high photothermal conversion efficiencies and high quality NIR photothermal imaging effects under NIR laser irradiation.Compound 1 shows the best photothermal conversion effect,and it provides a unique model to explore the relationship between the complex metal oxide structure and photothermal conversion behavior at the molecular level.Both the experimental results and theoretical calculations consistently conclude that the charge and degree of electron delocalization on the Cluster have a robust influence on the photothermal conversion,as well as the aggregation microstructures.展开更多
基金financially supported by the National Natural Science Foundation of China(No.52061014)the Natural Science Foundation of Henan Province(No.242300420352)+4 种基金the Key research and development program of Henan province(No.231111222200)the Key Scientific Research Projects of Higher Education Institutions in Henan Province(No.25CY025)the Leading Talents Program of Jiangxi Provincial Major Discipline Academic and Technical Leaders Training Program(No.20204BCJ22004)the Open Project awarded by Fujian Provincial Key Laboratory of Quantum Manipulation and New Energy Materials(No.QMNEM2002)Jiangxi Provincial Key Laboratory of Magnetic Metallic Materials and Devices(No.2024SSY05061)
文摘The non-volatile multi-level magnetic or resistance states switching is extremely promising for newgeneration high-density information storage.In this work,we propose a novel multiple-state magnetic memory based on the magnetic deflagration in a single Laves-phase Tb_(0.95)Mn_(1.5)Co_(0.5)compound with non-volatile and multilevel magnetic states switching.In consideration of the negative magnetization,six different magnetic states are achieved by simply applying the magnetic field.The abinitio calculations and neutron diffraction measurements indicate that the studied compound is a cubic structure withferromagnetic ordering at low temperature and the evolution in magnetic states(i.e.magnetic deflagration)should arise from the Barkhausen effect.The almost unchanged magnetic state under corresponding range of magnetic field enables the magnetization to be in the same magnitude even after 50 cyclic hysteresis loops.Furthermore,the retention,repeatable switching,and non-volatile characters of multi-level magnetic state have been primely confirmed.All these suggest that the Tb_(0.95)Mn_(1.5)Co_(0.5)compound with multiple magnetic deflagrations could be applied to multiple-state magnetic memory and this work would pave the way to design a novel multi-level magnetic storage.
基金financially supported by the Natural Science Foundation of Hunan Province(No.2020JJ4684)the Fundamental Research Funds for the Central Universities of Central South University(No.2021zzts0522)+1 种基金the Recruitment Program of Global Youth Expertsthe Open Project of the Key Laboratory of Digital Flavor Research of Hunan China Tobacco Industry Co.,Ltd(No.202143000834024)。
文摘Photothermal conversion is one of the key technologies in solar energy collection,seawater desalination,photo thermal treatment and other important fields.In order to develop next generation photothermal materials,four poly oxometalates,[(CH_(3))_(2)NH_(2)]_(12)H_(5)[Ni_(3)Mo_(18)O_(54)(HPO_(3))_(10)(PO_(4))]·_(18)H_(2)O(Compound 1),[(CH_(3))_(2)NH_(2)]_(1)Na_(11)[Ni_(2)Mo_(8)O_(22)(HPO_(3))_(10)]·16H_(2)O(Compound 2),Na_(15)(OH)_5[Mo_(6)O_(18)(HPO_(3))_(4)]_(2)[MoO]_(1.5)·16H_(2)O(Compound 3),[(CH_(3))_(2)NH_(2)]_(4)Na_(11)[Na[Mo_6O_(15)(HPO_(3))_(4)]_(2)]·_(18)H_(2)O(Compound 4),are successfully designed and synthesized via a micro wave-as sis ted reaction protocol.Compounds 1-4 not only exhibit broad absorption and notable photothermal conversion effects in near-infrared(NIR)region,but also have high photothermal conversion efficiencies and high quality NIR photothermal imaging effects under NIR laser irradiation.Compound 1 shows the best photothermal conversion effect,and it provides a unique model to explore the relationship between the complex metal oxide structure and photothermal conversion behavior at the molecular level.Both the experimental results and theoretical calculations consistently conclude that the charge and degree of electron delocalization on the Cluster have a robust influence on the photothermal conversion,as well as the aggregation microstructures.
