MODELING THE INFLUENCE OF STRUCTURAL AND COMPOSITIONAL DISORDER ON THE MAGNETIC-

2020-04-05 19:11:10

The magnetic grain Local Montreal

责任者: SZPUNAR, B;ZUGIC, R;ERB, U;LEWIS, LJ 单位: UNIV MONTREAL,DEPT PHYS,MONTREAL,PQ H3C 3J7,CANADA.;UNIV MONTREAL,RECH PHYS & TECHNOL COUCHES MINCES GRP,MONTREAL,PQ H3C 3J7,CANADA. 来源出处: CANADIAN METALLURGICAL QUARTERLY, v 34, JUL-SEP 1995, p 281- 286 摘要: The influence of the structural disorder at grain boundaries on the local magnetic moments has been investigated using molecular dynamics and the tight-binding-linear-muffin-tin-atomic-sphere-approximation (TB-LMTO-ASA) method. The correlation between the local structural disorder of grain boundaries and the local magnetic moment is discussed. While there is some variation in the values of the local moments, the average magnetic moment is very insensitive to the type of boundary. These results correlate extremely well with the recent observation that the saturation magnetization of fully dense electrodeposited nickel depends very little on grain size, down to about 10 nm. The local magnetic moments of the strong itinerant ferromagnets are, however, strongly dependent on alloying elements, which are used commonly to produce smaller grains in nanocrystalline materials. Alloying effects are discussed for Ni-P, Ni-Al and Co-W alloys. The influence of atom substitution on the host grain boundary is studied in the case of the Sigma = 5 nickel grain boundaries by replacing nickel atoms with aluminium. 关键词: NHS NANOGOLD; PEPTIDE RECEPTORS; NEUROPEPTIDES; GOLD LABELING; NONRADIOACTIVE METHOD; RAT NONRADIOACTIVE METHOD; RAT; NANOCRYSTALLINE MATERIALS; ULTRAFINE PARTICLES; AMORPHOUS IRON; FE; METALS; NICKEL; GLASS; NI METALS; NICKEL; GLASS; NI