排序方式: 共有22条查询结果,搜索用时 15 毫秒
1.
2.
D.L. Peng T.J. Konno K. Wakoh T. Hihara K. Sumiyama 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2001,16(1):329-332
Cluster-cluster coalescence process of monodispersed Co clusters with mean diameter d = 8.5 and 13 nm deposited a plasma-gas-condensation-type cluster beam deposition system was investigated by in situ electrical conductivity measurements and ex situ scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and analyzed by percolation concept. The electrical
conductivity measurement and TEM observation indicated that, below temperature T≈ 100°C, the Co clusters in the assemblies maintain their original structure as deposited at room temperature, while that the inter-cluster
coalescence takes place at T > 100°C, although the size distribution and the interface morphology of the clusters showed no marked change at substrate temperatures
T
s≤200°C.
Received 29 November 2000 相似文献
3.
4.
D. L. Peng H. Yamada K. Sumiyama T. Uchida T. Hihara 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2005,34(1-3):173-176
High-density, magnetically soft Fe cluster-assembled
films were obtained at room temperature by an energetic cluster deposition.
Size-monodispersed Fe clusters with the mean cluster size d = 9, 13 and 16 nm
were produced using a plasma-gas-condensation technique. Ionized clusters in
cluster beam were accelerated electrically and deposited onto the substrate
together with neutral clusters from the same cluster source. The morphology,
microstructure and magnetic properties of the cluster-assembled films have
been studied by an atomic force microscopy, scanning electron microscopy,
transmission electron microscopy, and superconducting quantum interference
device magnetometer. By increasing the impact energy of the ionized clusters
up to 0.6 eV/atom, the Fe cluster-assembled film has a packing fraction of
0.86±0.03, and reveals a soft magnetic behavior. In addition, it is
found that oxidization of the cluster-assembled films is remarkably
suppressed with the increase in the density of the films. 相似文献
5.
Sumiyama Kenji Katoh Ryoji Kadowaki Satoshi Hihara Takehiko 《Journal of nanoparticle research》2010,12(7):2589-2596
Journal of Nanoparticle Research - Using an improved plasma gas condensation cluster deposition system, Fe and Si clusters are prepared by a single glow discharge source and Fe/Si hybrid clusters... 相似文献
6.
By means of facing target dc sputtering, an amorphous phase has been produced for immiscible Fe---Cu---Ag alloys at around the central concentration of the ternary phase diagram. The radial distribution function estimated from X-ray diffraction measurements indicates that a tetrahedron is the dominant structure unit and that the average coordination number is about 11. In the extended X-ray absorption fine structure radial structure function, a clear peak is detected at the nearest neighbor distance, but the peak intensity is weaker than those for binary crystalline Fe---Cu and Fe---Ag alloys and no clear peak is detectable at larger distances. A hard or soft sphere dense random packing model is appropriate for the amorphous structure in these immiscible alloys. 相似文献
7.
As a generalization of Wedderburn's theorem, Herstein [5] proved that a finite ring R is commutative, if all nilpotent elements are contained in the center of R. However a finite ring with commuting nilpotent elements is not necessarily commutative. Recently, in [9] and [10], Simons described the structure of finite rings R with J(R)2 = 0 in a variety with definable principal congruences. In this paper, we will consider the difference between the finite commutative rings and the finite rings in which any two nilpotent elements commute with each other. As a consequence, we describe the structure of finite rings R with [J(R), J(R)] = 0 in a variety with definable principal congruences. 相似文献
8.
Wang L. S. Liu S. J. Guo H. Z. Chen Y. Yue G. H. Peng D. L. Hihara T. Sumiyama K. 《Applied Physics A: Materials Science & Processing》2012,106(3):717-723
The ferromagnetic transparent conducting film is a multifunctional film which has high visible transmittance, low resistivity
and room-temperature ferromagnetism, simultaneously. In this article, ferromagnetic transparent conducting ZnO:Al/Fe65Co35/ZnO:Al multilayer films were fabricated by inserting a middle magnetic Fe65Co35 layer into aluminum-doped zinc oxide (ZnO:Al) matrix using a magnetron sputtering apparatus at substrate temperature ranging
from room temperature (RT) to 400∘C. The total film thickness was about 400 nm and the middle Fe65Co35 alloy layer was 4 nm. The influences of substrate temperature (T
s
) on the structural, electrical, optical and magnetic properties of the multilayer films were systemically investigated. The
results showed that the microstructure and performance of the composite multilayer films strongly depended on the substrate
temperature. The present results also showed that the inserted middle Fe65Co35 alloy thin layer played an important role in providing the RT ferromagnetism and decreasing the resistivity of the multilayer films. Therefore, it is possible to obtain a multifunctional
film material with the combination of good optical transparency, high electrical conductivity and RT ferromagnetism. 相似文献
9.
Magnetic properties of a non-equilibrium Al(Fe–Ni) alloy powder by rod-milling and chemical leaching
In this paper, the magnetic properties of non-equilibrium nanocrystalline phase by chemical leaching of as-milled Al0.6(Fe0.5Ni0.5)0.4 powder is reported. X-ray diffractometry (XRD), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), vibrating sample magnetometry (VSM), and superconducting quantum interference device magnetometry (SQUID) were used to characterize the as-milled powder and leached specimens. The saturation magnetization Ms decreased approximately 15 times than that of the powder before milling. Magnetization sharply increased to approximately 580 °C, when cooling of the specimen from 750 °C. The broad peaks of the magnetization shifted towards a lower-temperature side and the peak intensity increased, with increasing external field. The irreversibility between the field-cooling (FC) and zero-field cooling (ZFC) for the specimen begins greatly above the wide ZFC magnetization maximum and occurs at relatively high temperature. The magnetization is higher at lower temperatures, with increasing external field. 相似文献
10.
Mössbauer spectra have been observed for Fe?Ag alloys sputter-deposited on liquid nitrogen cooled substrates and water cooled substrates under several Ar gas pressures, PAr. The magnetic hyperfine field does not depend on the substrate temperature. However, in paramagnetic spectra, a single line component corresponding to isolated Fe atoms in the Ag matrix is more pronounced for the alloys deposited on liquid nitrogen cooled substrates. The alloys deposited under high PAr reveal very weak intensity ratios of the second and fifth lines of the ferromagnetic sextet, indicating a tendency of perpendicular magnetic anisotropy. 相似文献