The influence of interfaces on the magneto-optical Kerr effect in the Co/Ni multilayer has been investigated.It was found that the magnetic-optical Kerr rotation varies with the numbers of interfaces(x)in Co/Ni multil...The influence of interfaces on the magneto-optical Kerr effect in the Co/Ni multilayer has been investigated.It was found that the magnetic-optical Kerr rotation varies with the numbers of interfaces(x)in Co/Ni multilayer,which indicated that the interface states play an important role in the Kerr effect.Moreover,ellipticity and optical constants n and k are also found to vary with x.Some possible mechanisms have been discussed.展开更多
Radular teeth of chitons were studied by using magnetic torque-meter and transmission electron microscopy (TEM). The magnetic torque curves give clear evidence of presence of strong uni-axial magnetic anisotropy. The ...Radular teeth of chitons were studied by using magnetic torque-meter and transmission electron microscopy (TEM). The magnetic torque curves give clear evidence of presence of strong uni-axial magnetic anisotropy. The easy axis is along the length direction of tongue-like radula. The TEM pattern shows that long chip-like magnetite nano-scaled particles packed in the radular teeth with both uni-axial shape anisotropy and magneto-crystalline anisotropy.展开更多
The hardening mechanism of nanocry st alline Sm_(2)Fe_(15-x)M_(x)Ga_(2)C,as well as the effect of small amounts of Cu and Nb additions on the hardening behavior were reported.It is shown that the hardening mechanism i...The hardening mechanism of nanocry st alline Sm_(2)Fe_(15-x)M_(x)Ga_(2)C,as well as the effect of small amounts of Cu and Nb additions on the hardening behavior were reported.It is shown that the hardening mechanism is mainly of the pinning-type in Sm_(2)Fe_(15-x)M_(x)Ga_(2)C ribbons.Ret ention of pinning-type behavior,with a marginal increase in coercivity was observed for a small addition of Cu.The hardening mechanism is mainly of nucleation-type in Sm_(2)Fe_(15-x)M_(x)Ga_(2)C with a slightly decrease in coercivity.展开更多
Effects of substituting small amounts of Si for Co on the structure and magnetic properties of Gd_(2)Co_(17) compounds were studied by means of x-ray diffraction and magnetization measurements.All samples are of singl...Effects of substituting small amounts of Si for Co on the structure and magnetic properties of Gd_(2)Co_(17) compounds were studied by means of x-ray diffraction and magnetization measurements.All samples are of single phase with the rhombohedra1 Th_(2)Zn_(17),type structure.The substitution of Si for Co leads to an approximately linear decrease in the unit cell volume.The saturation moment at 1.5 K decreases linearly with increasing Si concentration,being an approximately linear rate of about 4.1μB per substituted Si.The Curie temperature of Gd_(2)Co_(17-x)Si_(x) is found to decrease monotonously from 1213 to 651 K,as x increases from 0 to 3.X-ray diffraction measurements on magnetically aligned powders show that the easy magnetization direction of Gd_(2)Co_(17-x)Si_(x) compounds changes from basal plane to c-axis with increasing Si concentcation.The samples with x=2,3 exhibit a room temperature uniaxial anisotropy.展开更多
The magnetic properties of melt-spun(Fe_(1-x)Nd_(x))_(94)B_(6) alloys(x=0.07-0.90)are reported.Their spontaneous magnetizations are interpreted on the basis of a sperimagnetic structure with Nd and Fe cones.The highes...The magnetic properties of melt-spun(Fe_(1-x)Nd_(x))_(94)B_(6) alloys(x=0.07-0.90)are reported.Their spontaneous magnetizations are interpreted on the basis of a sperimagnetic structure with Nd and Fe cones.The highest coercivity at room temperature is 8 kOe for this as-quenched amorphous alloy system.展开更多
High field magnetization and thermomagnetic effects in the as-quenched and heat treated Fe_(78)Nd_(16)B_(6) alloys at different annealing temperatures and time are reported.There are two Curie temperatures to the as-q...High field magnetization and thermomagnetic effects in the as-quenched and heat treated Fe_(78)Nd_(16)B_(6) alloys at different annealing temperatures and time are reported.There are two Curie temperatures to the as-quenched sample.The temperature dependence of coercivity shows a maximum at around 180K for the as-quenched and heat treated samples.A coercive field of 14.8kOe and an energy product of 10MGOe are obtained at romm temperature by annealing at 600℃for 5min.Studies of magnetic anomaly at lower temperature have also been carried out.展开更多
The magnetic moments and Curie temperatures of amorphous Fe_(90-x)Co_(x)Zr_(10)(0cxc90)alloys have been measured experimentally.For x c30,the great enhancement of the magnetic moment is explained by the increase of ma...The magnetic moments and Curie temperatures of amorphous Fe_(90-x)Co_(x)Zr_(10)(0cxc90)alloys have been measured experimentally.For x c30,the great enhancement of the magnetic moment is explained by the increase of magnetic moment of iron atoms and the existence of two magnetic regions,while the increase of the Curie temperature with Co content is interpreted by the interactions of Fe-Co atoms which will be larger than that of Fe-Fe and Co-Co.展开更多
基金Supported by the Beijing Natural Science Foundationpartially by the National Natural Science Foundation of China under Grant Nos.59871063 and 59928101.
文摘The influence of interfaces on the magneto-optical Kerr effect in the Co/Ni multilayer has been investigated.It was found that the magnetic-optical Kerr rotation varies with the numbers of interfaces(x)in Co/Ni multilayer,which indicated that the interface states play an important role in the Kerr effect.Moreover,ellipticity and optical constants n and k are also found to vary with x.Some possible mechanisms have been discussed.
基金Supported by the National Natural Science Foundation of China under Grant No.19874078.
文摘Radular teeth of chitons were studied by using magnetic torque-meter and transmission electron microscopy (TEM). The magnetic torque curves give clear evidence of presence of strong uni-axial magnetic anisotropy. The easy axis is along the length direction of tongue-like radula. The TEM pattern shows that long chip-like magnetite nano-scaled particles packed in the radular teeth with both uni-axial shape anisotropy and magneto-crystalline anisotropy.
基金Supported by the National Natural Science Foundation of China under Grant Nos.59525101 and 59771024.
文摘The hardening mechanism of nanocry st alline Sm_(2)Fe_(15-x)M_(x)Ga_(2)C,as well as the effect of small amounts of Cu and Nb additions on the hardening behavior were reported.It is shown that the hardening mechanism is mainly of the pinning-type in Sm_(2)Fe_(15-x)M_(x)Ga_(2)C ribbons.Ret ention of pinning-type behavior,with a marginal increase in coercivity was observed for a small addition of Cu.The hardening mechanism is mainly of nucleation-type in Sm_(2)Fe_(15-x)M_(x)Ga_(2)C with a slightly decrease in coercivity.
基金Supported by the National Natural Science Foundation of China under Grant No.59525101。
文摘Effects of substituting small amounts of Si for Co on the structure and magnetic properties of Gd_(2)Co_(17) compounds were studied by means of x-ray diffraction and magnetization measurements.All samples are of single phase with the rhombohedra1 Th_(2)Zn_(17),type structure.The substitution of Si for Co leads to an approximately linear decrease in the unit cell volume.The saturation moment at 1.5 K decreases linearly with increasing Si concentration,being an approximately linear rate of about 4.1μB per substituted Si.The Curie temperature of Gd_(2)Co_(17-x)Si_(x) is found to decrease monotonously from 1213 to 651 K,as x increases from 0 to 3.X-ray diffraction measurements on magnetically aligned powders show that the easy magnetization direction of Gd_(2)Co_(17-x)Si_(x) compounds changes from basal plane to c-axis with increasing Si concentcation.The samples with x=2,3 exhibit a room temperature uniaxial anisotropy.
文摘The magnetic properties of melt-spun(Fe_(1-x)Nd_(x))_(94)B_(6) alloys(x=0.07-0.90)are reported.Their spontaneous magnetizations are interpreted on the basis of a sperimagnetic structure with Nd and Fe cones.The highest coercivity at room temperature is 8 kOe for this as-quenched amorphous alloy system.
文摘High field magnetization and thermomagnetic effects in the as-quenched and heat treated Fe_(78)Nd_(16)B_(6) alloys at different annealing temperatures and time are reported.There are two Curie temperatures to the as-quenched sample.The temperature dependence of coercivity shows a maximum at around 180K for the as-quenched and heat treated samples.A coercive field of 14.8kOe and an energy product of 10MGOe are obtained at romm temperature by annealing at 600℃for 5min.Studies of magnetic anomaly at lower temperature have also been carried out.
文摘The magnetic moments and Curie temperatures of amorphous Fe_(90-x)Co_(x)Zr_(10)(0cxc90)alloys have been measured experimentally.For x c30,the great enhancement of the magnetic moment is explained by the increase of magnetic moment of iron atoms and the existence of two magnetic regions,while the increase of the Curie temperature with Co content is interpreted by the interactions of Fe-Co atoms which will be larger than that of Fe-Fe and Co-Co.
