This paper presents the structural design and dynamic analysis of the magnetic field of the collector of machining wastes. From the viewpoint of energy the magnetic coupled force exerted on machining wastes by the no...This paper presents the structural design and dynamic analysis of the magnetic field of the collector of machining wastes. From the viewpoint of energy the magnetic coupled force exerted on machining wastes by the nonuniform magnetic field of a permanent magnet has been discussed. The difficult problem that machining wastes attracted by a permanent magnet above the iron base platform has been solved.展开更多
Considering the influences of the spin on the ground state energy,the properties of a weak-coupled magnetopolaron in quantum dots are studied by using a linear combination operator and unitary transformation method.Th...Considering the influences of the spin on the ground state energy,the properties of a weak-coupled magnetopolaron in quantum dots are studied by using a linear combination operator and unitary transformation method.The numerical calcu-lation results for CaP crystals have been given as examples.展开更多
The Au/Al2O3/Al metal/insulator/metal junction(MIMJ) and Au/SiO2/Si metal/insulator/Si junction(MISJ) have been constructed successfully. The light emission of these junctions was mediated by surface plasmon-polariton...The Au/Al2O3/Al metal/insulator/metal junction(MIMJ) and Au/SiO2/Si metal/insulator/Si junction(MISJ) have been constructed successfully. The light emission of these junctions was mediated by surface plasmon-polaritons(SPPs) under surface roughness. The light emission from MISJ was more uniform and stable than that from MIMJ. The light power of MISJ was about 2~3 orders higher than that of MIMJ. The light emission spectrum of MISJ was analyzed especially. In the spectrum, there was one main peak located at the wavelength of 610 nm^640 nm, which was mainly due to the couple of SPP with the surface roughness at the Au/air and Au/SiO2 interfaces. A weak peak located at the shorter wavelength region in the spectrum was also found, which was caused by the direct radiation of doped-Si plasma oscillation.展开更多
In considering next-nearest neighbor （NNN） coupling, we numerically investigate the magnetoelastic instability in ring-shaped mesoscopic antiferromagnetic Heisenberg spin 1/2 systems with spin-phonon interaction. Th...In considering next-nearest neighbor （NNN） coupling, we numerically investigate the magnetoelastic instability in ring-shaped mesoscopic antiferromagnetic Heisenberg spin 1/2 systems with spin-phonon interaction. The results indicate that, for antiferromagnetic NNN coupling J2, there may be a critical value J2^c, at which the ground state is dimerized for arbitrary lattice spring constant and beyond and below which the magnetoelastic instability behavior is different from each other. The values of J2^c are irrelevant to the system size. For ferromagnetic NNN coupling, only continuous transition is present from dimerized phase to uniform phase as lattice spring constant is increased.展开更多
The quantum electronic transport through a precessing magnetic spin coupled to noncollinearly polarized ferromagnetic leads （F-MS-F） has been studied in this paper. The nonequilibrium Green function approach is used...The quantum electronic transport through a precessing magnetic spin coupled to noncollinearly polarized ferromagnetic leads （F-MS-F） has been studied in this paper. The nonequilibrium Green function approach is used to calculate local density of states （LDOS） and current in the presence of external bias. The characters of LDOS and the electronic current are obtained. The tunneling current is investigated for different precessing angle and different configurations of the magnetization of the leads. The investigation revea/s that when the precessing angle takes θ 〈 π /2 and negative bias is applied, the resonant tunneling current appears, otherwise, it appears when positive bias is applied. When the leads are totally polarized and the precessing angel takes O, the tunneling current changes with the configuration of two leads; and it becomes zero when the two leads are antiparallel.展开更多
Using Bu4N[Fe(Tp*)(CN)3]- (Tp* = hydrotris(3,5-dimethylpyrazol-l-yl)borate) as the building block to react with Cun and N-methylimidazole, we obtained a one-dimensional (1D) beterobimetallic cyano-bridged chain, [Fe(T...Using Bu4N[Fe(Tp*)(CN)3]- (Tp* = hydrotris(3,5-dimethylpyrazol-l-yl)borate) as the building block to react with Cun and N-methylimidazole, we obtained a one-dimensional (1D) beterobimetallic cyano-bridged chain, [Fe(Tp*)(CN)3]2Cu(N- methylimidazole)2.2H20 (1). The crystal structures and magnetic studies demonstrate that complex 1 exhibits slow relaxation of the magnetization due to strong intrachain ferromagnetic coupling and weak interchain interactions.展开更多
Long-range magnetic orders in atomically thin ferromagnetic CrI3 trigger new fascinating physics and application perspectives.The physical properties of two-dimensional(2D)ferromagnetism CrI3 are significantly influen...Long-range magnetic orders in atomically thin ferromagnetic CrI3 trigger new fascinating physics and application perspectives.The physical properties of two-dimensional(2D)ferromagnetism CrI3 are significantly influenced by interlayer spacing and stacking order,which are sensitive to the hydrostatic pressure and external environments.However,there remains debate on the stacking order at low temperature.Here,we study the interlayer coupling and stacking order of non-encapsulated 2–5 layer and bulk CrI3 at 10 K by Raman spectroscopy;demonstrate a rhombohedral stacking in both antiferromagnetic and ferromagnetic CrI3.The opposite helicity dependence of Ag and Eg modes arising from phonon symmetry further validates the rhombohedral stacking.An anomalous temperature-dependent behavior is observed due to spin-phonon coupling below 60 K.Our study provides insights into the interlayer coupling and stacking orders of 2D ferromagnetic materials.展开更多
文摘This paper presents the structural design and dynamic analysis of the magnetic field of the collector of machining wastes. From the viewpoint of energy the magnetic coupled force exerted on machining wastes by the nonuniform magnetic field of a permanent magnet has been discussed. The difficult problem that machining wastes attracted by a permanent magnet above the iron base platform has been solved.
基金the National Natural Science Foundation of China (No. 10347004)
文摘Considering the influences of the spin on the ground state energy,the properties of a weak-coupled magnetopolaron in quantum dots are studied by using a linear combination operator and unitary transformation method.The numerical calcu-lation results for CaP crystals have been given as examples.
基金National Natural Science Foundation of China(69576006)
文摘The Au/Al2O3/Al metal/insulator/metal junction(MIMJ) and Au/SiO2/Si metal/insulator/Si junction(MISJ) have been constructed successfully. The light emission of these junctions was mediated by surface plasmon-polaritons(SPPs) under surface roughness. The light emission from MISJ was more uniform and stable than that from MIMJ. The light power of MISJ was about 2~3 orders higher than that of MIMJ. The light emission spectrum of MISJ was analyzed especially. In the spectrum, there was one main peak located at the wavelength of 610 nm^640 nm, which was mainly due to the couple of SPP with the surface roughness at the Au/air and Au/SiO2 interfaces. A weak peak located at the shorter wavelength region in the spectrum was also found, which was caused by the direct radiation of doped-Si plasma oscillation.
文摘In considering next-nearest neighbor （NNN） coupling, we numerically investigate the magnetoelastic instability in ring-shaped mesoscopic antiferromagnetic Heisenberg spin 1/2 systems with spin-phonon interaction. The results indicate that, for antiferromagnetic NNN coupling J2, there may be a critical value J2^c, at which the ground state is dimerized for arbitrary lattice spring constant and beyond and below which the magnetoelastic instability behavior is different from each other. The values of J2^c are irrelevant to the system size. For ferromagnetic NNN coupling, only continuous transition is present from dimerized phase to uniform phase as lattice spring constant is increased.
基金Supported by National Natural Science Foundation of China under Grant No. 10674092Shanghai Leading Academic Disciplines Project under Grant No. S30105
文摘The quantum electronic transport through a precessing magnetic spin coupled to noncollinearly polarized ferromagnetic leads （F-MS-F） has been studied in this paper. The nonequilibrium Green function approach is used to calculate local density of states （LDOS） and current in the presence of external bias. The characters of LDOS and the electronic current are obtained. The tunneling current is investigated for different precessing angle and different configurations of the magnetization of the leads. The investigation revea/s that when the precessing angle takes θ 〈 π /2 and negative bias is applied, the resonant tunneling current appears, otherwise, it appears when positive bias is applied. When the leads are totally polarized and the precessing angel takes O, the tunneling current changes with the configuration of two leads; and it becomes zero when the two leads are antiparallel.
基金financial support from the National Natural Science Foundation of China (21101021, 91122031)
文摘Using Bu4N[Fe(Tp*)(CN)3]- (Tp* = hydrotris(3,5-dimethylpyrazol-l-yl)borate) as the building block to react with Cun and N-methylimidazole, we obtained a one-dimensional (1D) beterobimetallic cyano-bridged chain, [Fe(Tp*)(CN)3]2Cu(N- methylimidazole)2.2H20 (1). The crystal structures and magnetic studies demonstrate that complex 1 exhibits slow relaxation of the magnetization due to strong intrachain ferromagnetic coupling and weak interchain interactions.
基金the financial support from the National Natural Science Foundation of China (51602040 and 51872039)the Science and Technology Program of Sichuan (M112018JY0025)the Scientific Research Foundation for New Teachers of UESTC (A03013023601007)
文摘Long-range magnetic orders in atomically thin ferromagnetic CrI3 trigger new fascinating physics and application perspectives.The physical properties of two-dimensional(2D)ferromagnetism CrI3 are significantly influenced by interlayer spacing and stacking order,which are sensitive to the hydrostatic pressure and external environments.However,there remains debate on the stacking order at low temperature.Here,we study the interlayer coupling and stacking order of non-encapsulated 2–5 layer and bulk CrI3 at 10 K by Raman spectroscopy;demonstrate a rhombohedral stacking in both antiferromagnetic and ferromagnetic CrI3.The opposite helicity dependence of Ag and Eg modes arising from phonon symmetry further validates the rhombohedral stacking.An anomalous temperature-dependent behavior is observed due to spin-phonon coupling below 60 K.Our study provides insights into the interlayer coupling and stacking orders of 2D ferromagnetic materials.
