Results show that the alloy with 10% Nd atom fraction has the highest remanence of 0.932 T,higher coercivity of 780 kA/m and the best thermal stability in NdxFe93-xB6Zr1 alloys,and that temperature coefficient of remanence is-0.154%/℃ and temperature coefficient of coercivity is-0.39%/℃ at 180 ℃.
The measurement of magnetic parameters indicated that the specific saturation magnetization was σ s=36.31×10 3/4π(A·m -1·g -1), coercivity was H c=6 750 A·m -1, and residual magnetism B r=4.39×10 3/4π(A·m -1·g -1).
The specific saturation magnetization σ s=33 76(×10 3/4πAm 2 ·g 1 ),the coercivity H C=13381Am -1 and residual magnetism σ r=6 86(×10 3/4πAm 2 ·g 1 )for the composite particles. The coercivity and residual magnetism are higher,it is shown that the composite supermicropower have hard magnetic properties.
The results show that when the percentage of NdFeB magnetic powder of the magnetic composite increases, the residual flux density Br, the maximum energy product (BH)m and the coercive force Hbc increase, but the intrinsic coercive force Hjc decreases a little.
The results of analysis show that the natural remanent magnetization of the sedimentary rocks in the study area is medium, generally reaching 1.9×10-2～9.4×10-1 A/m and their characteristic remanent magnetization reaches 3.9×10-2～5.0×10-1 A/m.
After annealing at 400℃ for 20 min, the in-plane coercivity of samples with Ag and Ti underlayer can be as high as 597kA/m, and 654kA/m, respectively, and the ratio of remanent magnetization to saturation magnetization reaches 0.81 and 0.94,respectively,implying the potential of the films as future magnetic recording media of ultrahigh density.
Detailed environmental magnetic measurements were carried out on CoreMD77-181 in the Bay of Bengal, Core MD98-2172 in the Eastern Timor Sea andCore MD98-2182 in the Caroline Basin in the western Pacific ocean, includinganhysteretic remanent magnetization, isothermal remanent magnetization, κ/T curvesand magnetic hysteresis parameters, compiled with mineralogical analyses and grainsize measurements. The results discover different effects of reductive diagenesis onthe three cores.
It is found out that when the substrate temperature is between 350 ℃ and 500 ℃,the films had ferromagnetism at room temperature,and the film grown at (400 ℃) had the best orientation along C axis on the (002) plane,while the saturation magnetization and remanent magnetization decrease monotonously with the increase of T_s.
Under these conditions there was a large net absorption of Cl-, a small net absorption of Na+ and a residual flux (JNetR) consistent with HCO3- secretion.
Replacement of Na+ or HCO3- (and CO2) in the media eliminated theIsc, net Cl- absorption and the residual flux.
Likewise, inclusion of the stilbene SITS in the serosal media eliminated theIsc, net Cl- absorption and the residual flux.
At normal levels of external Na+ (150mm) the bumetanide-sensitive uptake of K+ was dependent on Cl- and represented almost all of the K+ uptake, the residual flux demonstrating linear concentration dependence.
If a poleward meridional flow is present, it will accelerate the decay by carrying the residual flux to high latitudes where the line-of-sight components are small.
Cross plots of Mrs/Ms versus Bcr/Bc and χfd% versus χarm/saturation isothermal remanent magnetization (SIRM) indicate that the main magnetic grain sizes in surface soil are pseudo single domain (PSD) and multidomain (MD).
An available analytical expression for irreversible variations of the remanent magnetization in an open-shaped ferromagnetic body resulting from mechanical loading is examined experimentally.
A method for determining the coercive force and remanent magnetization as functions of the ferromagnetic phase concentration was suggested.
The contributions of these springs to the net magnetization cancel out, thus decreasing the averaged magnetic moment and the remanent magnetization without their rotation.
It is shown that magnetic colloids with an extremely low remanent magnetization (a few tens of amps per meter) may be obtained.