Electro-optical composites based on the product of electro-strictive and elasto-optical effects are developed. Layered composites of PbZr1-xTixO3 and polycarbonate are synthesised. Their electro-ptical properties are ...Electro-optical composites based on the product of electro-strictive and elasto-optical effects are developed. Layered composites of PbZr1-xTixO3 and polycarbonate are synthesised. Their electro-ptical properties are studied. The nominal transverse electro-optical coefficient of the composite is observed to be about 3.6 times larger than that of LiNbO3. Experiments and theoretical analyses show that the electro-optical effect of the composite has a strong ＇size effect＇. With the ratio of thickness/length decreasing or the width of elasto-optical phase increasing, the half-wave electric field intensity increases but the transverse electrc-optical coefficient decreases for the layered composite.展开更多
The perovskite La_(0.67)Ca_(0.33)MnO_3/La_(0.67)Sr_(0.33)CoO_3/La_(0.67)Ca_(0.33)MnO_3 trilayers were fabricated by a facing-target sputtering technique and their magnetotransport properties were investigated. The mag...The perovskite La_(0.67)Ca_(0.33)MnO_3/La_(0.67)Sr_(0.33)CoO_3/La_(0.67)Ca_(0.33)MnO_3 trilayers were fabricated by a facing-target sputtering technique and their magnetotransport properties were investigated. The magnetoresistance is dependent on spacer thickness and dramatically decreases when La_(0.67)Sr_(0.33)CoO_3 layer is thick enough because of its short-circuiting effect. Different from La_(0.67)Ca_(0.33)MnO_3 single layer, trilayer films with thin La_(0.67)Sr_(0.33)CoO_3 spacer have the enhanced metal-semiconductor transition temperature (T_(MS)) of La_(0.67)Ca_(0.33)MnO_3 layers. The magnetic coercivity H_C shows a nonmonotonic behavior with changing the spacer layer thickness at 230 K. The waist-like hysteresis indicates that there is an indirect exchange coupling between the top and bottom La_(0.67)Ca_(0.33)MnO_3 layers across the spacer La_(0.67)Sr_(0.33)CoO_3 layer.展开更多
The anisotropic magnetoresistance (MR) of La_(2/3)Ca_(1/3)MnO_3 (LCMO)/YBa_2Cu_4O_8 (YBCO) /LCMO sandwiches on (001) SrTiO_3 were investigated. Single layer LCMO and sandwiches show in-plane anisotropy of MR. MR stron...The anisotropic magnetoresistance (MR) of La_(2/3)Ca_(1/3)MnO_3 (LCMO)/YBa_2Cu_4O_8 (YBCO) /LCMO sandwiches on (001) SrTiO_3 were investigated. Single layer LCMO and sandwiches show in-plane anisotropy of MR. MR strongly depends on the magnetic field direction. A nearly sinusoidal dependence on the angle between the applied magnetic field and the film plane or transport current was observed. A positive MR was present with lower fields applied not only out-of-plane but also in-plane.展开更多
We have studied the transport property of the composites （La0.83Sr0.17 MnO3）1-x（ITO）x [ITO=（In2O3）0.95 （SNO2）0.05], which were fabricated by mechanically mixing La0.83Sr0.17MnO3 and ITO grains. A giant positiv...We have studied the transport property of the composites （La0.83Sr0.17 MnO3）1-x（ITO）x [ITO=（In2O3）0.95 （SNO2）0.05], which were fabricated by mechanically mixing La0.83Sr0.17MnO3 and ITO grains. A giant positive magnetoresistance （PMR） has been observed above the Curie temperature Tc for samples with x around 0.40, in addition to the negative magnetoresistanee related to spin-dependent interracial tunnelling below To. For （La0.83Sr0.17MnO3）0.6（ITO）0.4, the magnetoresistive ratio for the PMR can reach 39.3% under a magnetic field H=2.24×10^5A/m. Theoretical analysis suggests that the magnetic-field-induced broadening of the p-n barrier between both kinds of grains and the density of the p-n heterostructures should be responsible for the PMR behaviour.展开更多
Most of the reported observations are about the dynamic properties of individual domain-walls in magnetic nanowires,but the properties of multiple stripe-domains have rarely been investigated.Here,we demonstrate a sim...Most of the reported observations are about the dynamic properties of individual domain-walls in magnetic nanowires,but the properties of multiple stripe-domains have rarely been investigated.Here,we demonstrate a simple but efficient scenario for multiple domains injection in magnetic nanowires.The domain-chains(DCs),a cluster of multiple domains,can be dynamically generated with tunable static properties.It is found that the number of domains in a single DC can be dynamically adjusted by varying the frequency of microwave field(MF)and the period of spin-polarized current(SPC)intensity.The static properties of the DCs,i.e.,its length,spacing,and period between neighboring DCs,can be dynamically controlled by regulating the frequency of MF and the intensity of SPC.We have also discussed the possibility of using domain-chains as information carries,which provides a meaningful approach for flexible multi-bit information storage applications.展开更多
In this work,we experimentally investigated the thermal stability of the interlayer exchange coupling field(Hex)and strength(-Jiec)in synthetic antiferromagnetic(SAF)structure of[Pt(0.6)/Co(0.6)]_(2)/Ru(tRu)/[Co(0.6)/...In this work,we experimentally investigated the thermal stability of the interlayer exchange coupling field(Hex)and strength(-Jiec)in synthetic antiferromagnetic(SAF)structure of[Pt(0.6)/Co(0.6)]_(2)/Ru(tRu)/[Co(0.6)/Pt(0.6)]_(4)multilayers with perpendicular anisotropy.Depending on the thickness of the spacing ruthenium(Ru)layer,the observed interlayer exchange coupling can be either ferromagnetic or antiferromagnetic.The Hexwere studied by measuring the magnetization hysteresis loops in the temperature range from 100 K to 700 K as well as the theoretical calculation of the-Jiec.It is found that the interlayer coupling in the multilayers is very sensitive to the thickness of Ru and temperature.The Hexexhibits either a linear or a non-linear dependence on the temperature for different thickness of Ru.Furthermore,our SAF multilayers show a high thermal stability even up to 600 K(H_(ex)=3.19 kOe,-J_(iec)=1.97 erg/cm^(2) for t_(Ru)=0.6 nm,the unit 1 Oe=79.5775 A·m^(-1)),which was higher than the previous studies.展开更多
基金supported by the National Natural Science Foundation of China (Grant No. 50977046)
文摘Electro-optical composites based on the product of electro-strictive and elasto-optical effects are developed. Layered composites of PbZr1-xTixO3 and polycarbonate are synthesised. Their electro-ptical properties are studied. The nominal transverse electro-optical coefficient of the composite is observed to be about 3.6 times larger than that of LiNbO3. Experiments and theoretical analyses show that the electro-optical effect of the composite has a strong ＇size effect＇. With the ratio of thickness/length decreasing or the width of elasto-optical phase increasing, the half-wave electric field intensity increases but the transverse electrc-optical coefficient decreases for the layered composite.
文摘The perovskite La_(0.67)Ca_(0.33)MnO_3/La_(0.67)Sr_(0.33)CoO_3/La_(0.67)Ca_(0.33)MnO_3 trilayers were fabricated by a facing-target sputtering technique and their magnetotransport properties were investigated. The magnetoresistance is dependent on spacer thickness and dramatically decreases when La_(0.67)Sr_(0.33)CoO_3 layer is thick enough because of its short-circuiting effect. Different from La_(0.67)Ca_(0.33)MnO_3 single layer, trilayer films with thin La_(0.67)Sr_(0.33)CoO_3 spacer have the enhanced metal-semiconductor transition temperature (T_(MS)) of La_(0.67)Ca_(0.33)MnO_3 layers. The magnetic coercivity H_C shows a nonmonotonic behavior with changing the spacer layer thickness at 230 K. The waist-like hysteresis indicates that there is an indirect exchange coupling between the top and bottom La_(0.67)Ca_(0.33)MnO_3 layers across the spacer La_(0.67)Sr_(0.33)CoO_3 layer.
文摘The anisotropic magnetoresistance (MR) of La_(2/3)Ca_(1/3)MnO_3 (LCMO)/YBa_2Cu_4O_8 (YBCO) /LCMO sandwiches on (001) SrTiO_3 were investigated. Single layer LCMO and sandwiches show in-plane anisotropy of MR. MR strongly depends on the magnetic field direction. A nearly sinusoidal dependence on the angle between the applied magnetic field and the film plane or transport current was observed. A positive MR was present with lower fields applied not only out-of-plane but also in-plane.
基金Project supported by the National Natural Science Foundation of China （Grant No 20473038）, the Foundation of High-Tech Project in Jiangsu province, China （Grant No BG-2005401）.
文摘We have studied the transport property of the composites （La0.83Sr0.17 MnO3）1-x（ITO）x [ITO=（In2O3）0.95 （SNO2）0.05], which were fabricated by mechanically mixing La0.83Sr0.17MnO3 and ITO grains. A giant positive magnetoresistance （PMR） has been observed above the Curie temperature Tc for samples with x around 0.40, in addition to the negative magnetoresistanee related to spin-dependent interracial tunnelling below To. For （La0.83Sr0.17MnO3）0.6（ITO）0.4, the magnetoresistive ratio for the PMR can reach 39.3% under a magnetic field H=2.24×10^5A/m. Theoretical analysis suggests that the magnetic-field-induced broadening of the p-n barrier between both kinds of grains and the density of the p-n heterostructures should be responsible for the PMR behaviour.
基金Project supported by the National Natural Science Foundation of China(Grant No.11704191)the Jiangsu Specially-Appointed Professor,the Natural Science Foundation of Jiangsu Province of China(Grant No.BK20171026)the Six-Talent Peaks Project in Jiangsu Province,China(Grant No.XYDXX-038)
文摘Most of the reported observations are about the dynamic properties of individual domain-walls in magnetic nanowires,but the properties of multiple stripe-domains have rarely been investigated.Here,we demonstrate a simple but efficient scenario for multiple domains injection in magnetic nanowires.The domain-chains(DCs),a cluster of multiple domains,can be dynamically generated with tunable static properties.It is found that the number of domains in a single DC can be dynamically adjusted by varying the frequency of microwave field(MF)and the period of spin-polarized current(SPC)intensity.The static properties of the DCs,i.e.,its length,spacing,and period between neighboring DCs,can be dynamically controlled by regulating the frequency of MF and the intensity of SPC.We have also discussed the possibility of using domain-chains as information carries,which provides a meaningful approach for flexible multi-bit information storage applications.
基金Project supported by the National Natural Science Foundation of China(Grant No.11704191)the Jiangsu Specially-Appointed Professor,the Natural Science Foundation of Jiangsu Province of China(Grant No.BK20171026)the Six-Talent Peaks Project in Jiangsu Province,China(Grant No.XYDXX-038)
文摘In this work,we experimentally investigated the thermal stability of the interlayer exchange coupling field(Hex)and strength(-Jiec)in synthetic antiferromagnetic(SAF)structure of[Pt(0.6)/Co(0.6)]_(2)/Ru(tRu)/[Co(0.6)/Pt(0.6)]_(4)multilayers with perpendicular anisotropy.Depending on the thickness of the spacing ruthenium(Ru)layer,the observed interlayer exchange coupling can be either ferromagnetic or antiferromagnetic.The Hexwere studied by measuring the magnetization hysteresis loops in the temperature range from 100 K to 700 K as well as the theoretical calculation of the-Jiec.It is found that the interlayer coupling in the multilayers is very sensitive to the thickness of Ru and temperature.The Hexexhibits either a linear or a non-linear dependence on the temperature for different thickness of Ru.Furthermore,our SAF multilayers show a high thermal stability even up to 600 K(H_(ex)=3.19 kOe,-J_(iec)=1.97 erg/cm^(2) for t_(Ru)=0.6 nm,the unit 1 Oe=79.5775 A·m^(-1)),which was higher than the previous studies.
