The dependence of giant magnetoresistance of sputtered granular type(Co-Ag)/Ag multilayers on the thickness of Ag layers and magnetic layers with varying Co content in the magnetic layers was studied.The magnetoresist...The dependence of giant magnetoresistance of sputtered granular type(Co-Ag)/Ag multilayers on the thickness of Ag layers and magnetic layers with varying Co content in the magnetic layers was studied.The magnetoresistance ratioΔR/R was found to be enhanced by 2-7 times comparing with the single layer granular films.The enhancement was explained by the antiferromagnetic coupling due to magnetostatic interaction between the Co clusters in neighboring magnetic layers.展开更多
In this letter,a theoretical fit of nuclear magnetic resonance spectra of ^(63)Cu in Cu layers of Fe/Cu multilayers is given based on RKKY theory.The values of exchange field and additional Knight shift are fitted,whi...In this letter,a theoretical fit of nuclear magnetic resonance spectra of ^(63)Cu in Cu layers of Fe/Cu multilayers is given based on RKKY theory.The values of exchange field and additional Knight shift are fitted,which agree approximately with the experimental data.展开更多
Ovarian mesenchymal cells(oMCs)constitute a distinct microenvironment that supports folliculogenesis under physiological conditions.Supplementation of exogenous non-ovarian mesenchymal-related cells has been reported ...Ovarian mesenchymal cells(oMCs)constitute a distinct microenvironment that supports folliculogenesis under physiological conditions.Supplementation of exogenous non-ovarian mesenchymal-related cells has been reported to be an efficient approach to improve ovarian functions.However,the development and cellular and molecular characteristics of endogenous oMCs remain largely unexplored.In this study,we surveyed the single-cell transcriptomic landscape to dissect the cellular and molecular changes associated with the aging of oMCs in mice.Our results showed that the oMCs were composed of five ovarian differentiatedMC(odMC)populations and one ovarian mesenchymal progenitor(oMP)cell population.These cells could differentiate into various odMCs via an oMP-derived route to construct the ovarian stroma structures.Comparative analysis revealed that ovarian aging was associated with decreased quantity of oMP cells and reduced quality of odMCs.Based on the findings of bioinformatics analysis,we designed different strategies involving supplementation with young oMCs to examine their effects on female fertility and health.Our functional investigations revealed that oMCs supplementation prior to ovarian senescence was the optimal method to improve female fertility and extend the reproductive lifespan of aged females in the longterm.展开更多
The effects of the annealing temperature and time on the structure and magnetic properties of the sputtered BiDy-iron garnet films were investigated.X-ray diffraction analysis shows that the as-sputtered films are amo...The effects of the annealing temperature and time on the structure and magnetic properties of the sputtered BiDy-iron garnet films were investigated.X-ray diffraction analysis shows that the as-sputtered films are amorphous.After annealing at about 550℃,amorphous films crystallize into the garnet phase and an unknown phase.The intensity of the unknown phase decreases with increasing annealing temperature and time and vanishes at 650℃for 30min.It is found that the unknown phase has a large influence on the half-width of the(420)x-ray diffraction peak.The as-sputtered films have a very small magnetization of about 1 emu/g at room temperature.When films are annealed above 570℃,the magnetization increases rapidly with increasing annealing temperature and time.展开更多
Fe/Cu compositionally modulated films made by rf sputtering were investigated with ferromagnetic resonance.Spin wave resonances related to interlayer exchange coupling were observed and the phase change of the spin wa...Fe/Cu compositionally modulated films made by rf sputtering were investigated with ferromagnetic resonance.Spin wave resonances related to interlayer exchange coupling were observed and the phase change of the spin wave was shared by both the Fe and Cu sublayers.The effective spin wave dispersion coefficient was found to increase with increasing thickness of Cu sublayers.展开更多
In this paper the magneto-optical polar Kerr rotation spectra of composition-ally modulated films(CMF)Co/Pt are calculated by using Fresnel’s equations.For CMF Co/Pt with d_(Co)/d_(pt)=1/2,1 and 2 the magneto-optical...In this paper the magneto-optical polar Kerr rotation spectra of composition-ally modulated films(CMF)Co/Pt are calculated by using Fresnel’s equations.For CMF Co/Pt with d_(Co)/d_(pt)=1/2,1 and 2 the magneto-optical Kerr rotation at any wavelength increases with the increasing modulation wavelength in the wavelength region from 200 to 800nm.For CMF Co/Pt of constant d_(pt) the Kerr rotation increases with d_(Co) increasing while of constant d_(Co) the Kerr rotation increases with d_(pt) decreasing.From numerical calculations it is suggested that for CMF Co/Pt with small d_(pt) the Pt sublayer is polarized and has a positive contribution to the Kerr rotation of CMF Co/Pt.展开更多
We measured the time decay of the magnetic moment of high Tc supercon-ductors YBa_(2)Cu_(3)O_(7-δ);ceranic samples and found the memory effect which has hitherto been reported ouly in single crystals.The temperature ...We measured the time decay of the magnetic moment of high Tc supercon-ductors YBa_(2)Cu_(3)O_(7-δ);ceranic samples and found the memory effect which has hitherto been reported ouly in single crystals.The temperature and feld ranges,especialy the memory time are diferent from those of the latter.We believed that the memory phenomenon in ceramic samples at liquid nitrogen temperature can only be understood in a combined picture of both fux creep and glass behaviour.展开更多
In this paper single layer NdFe film,bilayer NdFe/Cu and NdFe/Al films made by vacuum evaporation were studied.The magneto-optical Kerr effect(MOKE)and reflectivity spectra were measured.The following results were fou...In this paper single layer NdFe film,bilayer NdFe/Cu and NdFe/Al films made by vacuum evaporation were studied.The magneto-optical Kerr effect(MOKE)and reflectivity spectra were measured.The following results were found:the contribution of Nd to MOKE is mainly at short wavelengths,for NdFe/Al the MOKE enhancement locates in the short wavelength range and for NdFe/Cu the enhancement peak locates near the absorption edge of reflector Cu,and in the MOKE spectra of bilayer NdFe/Cu film with some compositions,sign reversals were observed.展开更多
The magneto-optical Kerr rotation spectra in the region 400-700nm is studied for single layer Fe films.Experimental and theoretical calculation show that in the whole measurement wavelength range an enhancement of Ker...The magneto-optical Kerr rotation spectra in the region 400-700nm is studied for single layer Fe films.Experimental and theoretical calculation show that in the whole measurement wavelength range an enhancement of Kerr rotation occurs when the thickness of Fe is smaller than about 150Å.The thickness dependence of Kerr rotation of single layer Fe and Fe/Cu bilayer is compared.It is concluded that the Kerr rotation is dependent sensitively on the optical constants of underlying materials and the thickness of magnetic layer.展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos.19754001 and 59392800,and Shanghai Research Center for Applied Physics.
文摘The dependence of giant magnetoresistance of sputtered granular type(Co-Ag)/Ag multilayers on the thickness of Ag layers and magnetic layers with varying Co content in the magnetic layers was studied.The magnetoresistance ratioΔR/R was found to be enhanced by 2-7 times comparing with the single layer granular films.The enhancement was explained by the antiferromagnetic coupling due to magnetostatic interaction between the Co clusters in neighboring magnetic layers.
基金Supported by National Natural Science Foundation of ChinaState Education Commission and State Key Laboratory of Magnetism.
文摘In this letter,a theoretical fit of nuclear magnetic resonance spectra of ^(63)Cu in Cu layers of Fe/Cu multilayers is given based on RKKY theory.The values of exchange field and additional Knight shift are fitted,which agree approximately with the experimental data.
基金supported by the National Key Research and Development Program of China (2022YFC2703800)the National Natural Science Foundation of China (82230051)the 2115 Talent Development Program of China Agricultural University (1021-00109022)。
文摘Ovarian mesenchymal cells(oMCs)constitute a distinct microenvironment that supports folliculogenesis under physiological conditions.Supplementation of exogenous non-ovarian mesenchymal-related cells has been reported to be an efficient approach to improve ovarian functions.However,the development and cellular and molecular characteristics of endogenous oMCs remain largely unexplored.In this study,we surveyed the single-cell transcriptomic landscape to dissect the cellular and molecular changes associated with the aging of oMCs in mice.Our results showed that the oMCs were composed of five ovarian differentiatedMC(odMC)populations and one ovarian mesenchymal progenitor(oMP)cell population.These cells could differentiate into various odMCs via an oMP-derived route to construct the ovarian stroma structures.Comparative analysis revealed that ovarian aging was associated with decreased quantity of oMP cells and reduced quality of odMCs.Based on the findings of bioinformatics analysis,we designed different strategies involving supplementation with young oMCs to examine their effects on female fertility and health.Our functional investigations revealed that oMCs supplementation prior to ovarian senescence was the optimal method to improve female fertility and extend the reproductive lifespan of aged females in the longterm.
基金the National Natural Science Foundation of ChinaState Key Laboratory of Magnetism,Institute of Physics,Chinese Academy of Sciences.
文摘The effects of the annealing temperature and time on the structure and magnetic properties of the sputtered BiDy-iron garnet films were investigated.X-ray diffraction analysis shows that the as-sputtered films are amorphous.After annealing at about 550℃,amorphous films crystallize into the garnet phase and an unknown phase.The intensity of the unknown phase decreases with increasing annealing temperature and time and vanishes at 650℃for 30min.It is found that the unknown phase has a large influence on the half-width of the(420)x-ray diffraction peak.The as-sputtered films have a very small magnetization of about 1 emu/g at room temperature.When films are annealed above 570℃,the magnetization increases rapidly with increasing annealing temperature and time.
基金the National Natural Science Foundation of China,State Education Commission and State Key Laboratory of Magnetism.
文摘Fe/Cu compositionally modulated films made by rf sputtering were investigated with ferromagnetic resonance.Spin wave resonances related to interlayer exchange coupling were observed and the phase change of the spin wave was shared by both the Fe and Cu sublayers.The effective spin wave dispersion coefficient was found to increase with increasing thickness of Cu sublayers.
基金Supported by the National Natural Science Foundation of China,and Magnetism Lab.of CAS.
文摘In this paper the magneto-optical polar Kerr rotation spectra of composition-ally modulated films(CMF)Co/Pt are calculated by using Fresnel’s equations.For CMF Co/Pt with d_(Co)/d_(pt)=1/2,1 and 2 the magneto-optical Kerr rotation at any wavelength increases with the increasing modulation wavelength in the wavelength region from 200 to 800nm.For CMF Co/Pt of constant d_(pt) the Kerr rotation increases with d_(Co) increasing while of constant d_(Co) the Kerr rotation increases with d_(pt) decreasing.From numerical calculations it is suggested that for CMF Co/Pt with small d_(pt) the Pt sublayer is polarized and has a positive contribution to the Kerr rotation of CMF Co/Pt.
基金Supported by the National Center of China for Research and Development on Supereonductivity.
文摘We measured the time decay of the magnetic moment of high Tc supercon-ductors YBa_(2)Cu_(3)O_(7-δ);ceranic samples and found the memory effect which has hitherto been reported ouly in single crystals.The temperature and feld ranges,especialy the memory time are diferent from those of the latter.We believed that the memory phenomenon in ceramic samples at liquid nitrogen temperature can only be understood in a combined picture of both fux creep and glass behaviour.
基金Supported by the National Natural Foundation of China and Magnetism Laboratory of Academia Sinica.
文摘In this paper single layer NdFe film,bilayer NdFe/Cu and NdFe/Al films made by vacuum evaporation were studied.The magneto-optical Kerr effect(MOKE)and reflectivity spectra were measured.The following results were found:the contribution of Nd to MOKE is mainly at short wavelengths,for NdFe/Al the MOKE enhancement locates in the short wavelength range and for NdFe/Cu the enhancement peak locates near the absorption edge of reflector Cu,and in the MOKE spectra of bilayer NdFe/Cu film with some compositions,sign reversals were observed.
基金This work is supported by NSFC and Magnetism Laboratory of CAS.
文摘The magneto-optical Kerr rotation spectra in the region 400-700nm is studied for single layer Fe films.Experimental and theoretical calculation show that in the whole measurement wavelength range an enhancement of Kerr rotation occurs when the thickness of Fe is smaller than about 150Å.The thickness dependence of Kerr rotation of single layer Fe and Fe/Cu bilayer is compared.It is concluded that the Kerr rotation is dependent sensitively on the optical constants of underlying materials and the thickness of magnetic layer.
