重型机械企业信息化中的物料编码解决方案

制造企业实施信息化是以现代信息技术改造传统工业的有效手段。企业信息的集成是实施信息化的基础。本文作者在西安冶金机械有限公司实施ERP系统的实践中,在设计和工艺阶段有机整合现有的CAD和CAPP功能,通过解决物料编码的添加的问题,为重型机械制造企业实施ERP系统提供了有益的借鉴和指导。

贫化电炉炉用耐火材料的优化配置

在充分了解了贫化电炉的工艺要求、使用环境,才能够选择与之相适应的、优化的耐火材料配置,既能配合冶炼工艺的生产节奏,又能达到低成本的效果。

The 20-nm Skyrmion Generated at Room Temperature by Spin-Orbit Torques

The discovery of magnetic skyrmions provides a promising pathway for developing functional spintronic memory and logic devices. Towards the future high-density memory application, nanoscale skyrmions with miniaturized diameters, ideally down to 20 nm are required. Using x-ray magnetic circular dichroism transmission microscopy,nanoscale skyrmions are observed in the [Pt/Co/Ir]15 multilayer at room temperature. In particular, small skyrmions with minimum diameters approaching 20 nm could be generated by the current-induced spin-orbit torques. Through implementing material specific parameters, the dynamic process of skyrmion generation is further investigated by performing micromagnetic simulations. According to the simulation results, we find that both the tube-like Neel-type skyrmions and the bobber-like Neel-type skyrmions can be electrically generated. In particular, the size of the bobber-like Neel-type skyrmions can be effectively reduced by the spin-orbit torques,which leads to the formation of 20 nm Neel-type skyrmions. Our findings could be important for understanding the formation dynamics of nanoscale Neel-type spin textures, skyrmions and bobber in particular, which could also be useful for promoting nanoscale skyrmionic memories and logic devices.

Optimized growth of compensated ferrimagnetic insulator Gd_(3)Fe_(5)O_(12)with a perpendicular magnetic anisotropy

Compensated ferrimagnetic insulators are particularly interesting for enabling functional spintronic,optical,and microwave devices.Among many different garnets,Gd_(3)Fe_(5)O_(12)(GdIG)is a representative compensated ferrimagnetic insulator.In this paper,we will study the evolution of the surface morphology,the magnetic properties,and the magnetization compensation through changing the following parameters:the annealing temperature,the growth temperature,the annealing duration,and the choice of different single crystalline garnet substrates.Our objective is to find the optimized growth condition of the GdIG films,for the purpose of achieving a strong perpendicular magnetic anisotropy(PMA)and a flat surface,together with a small effective damping parameter.Through our experiments,we have found that the surface roughness approaching 0.15 nm can be obtained by choosing the growth temperature around 700℃,together with an enhanced PMA.We have also found the modulation of magnetic anisotropy by choosing different single crystalline garnet substrates which change the tensile strain to the compressive strain.A measure of the effective magnetic damping parameter(α_(eff)=0.04±0.01)through a spin pumping experiment in a GdIG/Pt bilayer is also made.Through optimizing the growth dynamics of GdIG films,our results could be useful for synthesizing garnet films with a PMA,which could be beneficial for the future development of ferrimagnetic spintronics.

Gate Tunable Supercurrent in Josephson Junctions Based on Bi_(2)Te_(3) Topological Insulator Thin Films

We report transport measurements on Josephson junctions consisting of Bi_(2)Te_(3) topological insulator(TI)thin films contacted by superconducting Nb electrodes.For a device with junction length L=134 nm,the critical supercurrent Ic can be modulated by an electrical gate which tunes the carrier type and density of the TI film.Ic can reach a minimum when the TI is near the charge neutrality regime with the Fermi energy lying close to the Dirac point of the surface state.In the p-type regime the Josephson current can be well described by a short ballistic junction model.In the n-type regime the junction is ballistic at 0.7 K<T<3.8 K while for T<0.7 K the diffusive bulk modes emerge and contribute a larger Ic than the ballistic model.We attribute the lack of diffusive bulk modes in the p-type regime to the formation of p-n junctions.Our work provides new clues for search of Majorana zero mode in TI-based superconducting devices.

Evolution of domain structure in Fe_(3)GeTe_(2)

Two-dimensional(2D)magnets provide an ideal platform to explore new physical phenomena in fundamental magnetism and to realize the miniaturization of magnetic devices.The study on its domain structure evolution with thickness is of great significance for better understanding the 2D magnetism.Here,we investigate the magnetization reversal and domain structure evolution in 2D ferromagnet Fe_(3)GeTe_(2)(FGT)with a thickness range of 11.2-112 nm.Three types of domain structures and their corresponding hysteresis loops can be obtained.The magnetic domain varies from a circular domain via a dendritic domain to a labyrinthian domain with increasing FGT thickness,which is accompanied by a transition from squared to slanted hysteresis loops with reduced coercive fields.These features can be ascribed to the total energy changes from exchange interaction-dominated to dipolar interaction-dominated with increasing FGT thickness.Our finding not only enriches the fundamental magnetism,but also paves a way towards spintronics based on 2D magnet.

磁性斯格明子的旋性布朗运动研究

从布朗运动的发现历史出发,介绍了布朗运动的运动特点与研究方法.结合具体的材料体系,详述了如何使用磁光克尔效应显微镜观察并采集单个磁性斯格明子的随机热运动行为.通过分析,最终发现磁性斯格明子随温度非线性增强的扩散行为,和与拓扑特性相关的旋进现象,以期为实验教学与科学研究提供思路与指导.

物料编码系统解决方案在ERP实施中的应用

制造企业实施信息化是以现代信息技术改造传统工业的有效手段。制造企业有效的集成各种信息技术的成果是实施信息化的基础。西安冶金机械有限公司在实施ERP系统的实践中,通过在设计和工艺阶段有效地进行物料编码,解决了大量数据手工录入的问题,为制造企业实施ERP系统提供了有益的借鉴和指导。

磁性多层膜中斯格明子的前景与挑战

拓扑磁学是近年内磁学领域内衍生出的一个子学科,它以寻找、研究和利用磁性材料中的拓扑自旋结构为核心目标,相关研究在凝聚态物理领域内已成为一个较大的分支。这些拓扑自旋结构包括:磁涡旋(magnetic vortex)、磁性斯格明子(magnetic skyrmion)、磁浮子(magnetic bobber)等。文章将以磁性多层膜中的斯格明子为对象,从材料优化、拓扑物理、表征、操控、探测等角度出发,详细讨论当前的主要研究热点,以及未来功能器件应用方面的一些挑战。