tailieunhanh - Fabrication and magnetic properties of Nd2Fe14B/Fe65Co35 hard magnetic ribbons

In addition, the intrinsic coercivity (iHc) of kOe and remanence coercivity (bHc) of kOe were found for these ribbons. The roles of the soft Fe65Co35 phase in the increasing of Tc,Br as well as in the (00l) preferred crystallographic orientation of hard magnetic grains on the free surface side of the fabricated ribbons were also discussed. | Communications in Physics, Vol. 23, No. 2 (2013), pp. 147-153 FABRICATION AND MAGNETIC PROPERTIES OF Nd2 Fe14 B/Fe65 Co35 HARD MAGNETIC RIBBONS NGUYEN XUAN TRUONG Institute of Materials Science, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi, Vietnam NGUYEN VAN KHANH Hanoi National University of Education 136 Xuan Thuy Street, Cau Giay District, Vietnam Received 01 April 2013; revised manuscript received 27 May 2013 Accepted for publication 21 May 2013 Abstract. Nd2 Fe14 B/Fe65 Co35 hard magnetic ribbons were fabricated by melt-spinning technique using Nd16 Fe76 B8 and Fe65 Co35 pre-alloys as starting materials. The results showed that the formation of the interactive hard/soft nanocomposite with the homogeneous distribution of the FeCo phase throughout the Nd2 Fe14 B matrix provided the Curie temperature (Tc ) as high as 747K, the magnetic remanence (Br ) of kG and the maximum energy product, (BH)max , of for the fabricated Nd2 Fe14 B/Fe65 Co35 ribbons at the optimal speed of 25 m/s. In addition, the intrinsic coercivity (i Hc ) of kOe and remanence coercivity (b Hc ) of kOe were found for these ribbons. The roles of the soft Fe65 Co35 phase in the increasing of Tc ,Br as well as in the (00l) preferred crystallographic orientation of hard magnetic grains on the free surface side of the fabricated ribbons were also discussed. I. INTRODUCTION Melt-spun Nd2 Fe14 B-based nanocomposite ribbons have been studied for almost 30 years [1]. The major research on these materials was focused to improve their magnetic properties by controlling the melt-spinning process, changing the ratio of component elements of the original alloy and annealing regime to optimize nanocomposite microstructure. In general, the (BH) max could get value beyond the threshold of 20 , but mainly the values were given in the range of 12 – 18 [2-12]. As reported the (BH) max threshold values were achieved by using complex .

• Vật lý
• Communications in Physics
• Fabrication and magnetic properties
• Nd2Fe14B Fe65Co35 hard magnetic ribbons
• The intrinsic coercivity
• Hard magnetic grains
• Challenges in particle physics and 3 3 1 models
• Particle physics and 3 3 1 models
• Particle theory and field theory models
• The early Universe
• Non standard model neutrino
• The 3 3 1 models in current particle physics
• Current particle physics
• The Standard Model
• The electro weak
• The process of e+e − → µ +µ
• The randall sundrum model
• Supersymmetric model and unparticle physics
• Randall Sundrum model
• Supersymmetric and Unparticle physics
• Handbook of mechanical engineering
• mechanical engineering
• mechanical design
• mechanical materials
• alloy materials
• Energy Technology
• Compact device model for nanoparticle organic memory transistor’s characterization
• Nanoparticle organic memory transistor
• Hybrid integrated circuit
• Hybrid NOMFET CMOS neuromorphic computing circuit
• Microdroplet in T junction microfluidic system
• Experiment and simulation
• T junction microfluidic system
• Lateral channel decrease
• Optical bistability in three level eit configurations
• Three level eit configurations
• Effects of atomic coherence
• OB in V type system
• Dynamical codimension 2 brane
• Warped six dimensional space time
• Codimension 2 brane
• Warped 6D bulk space time
• Coherent diffractive imaging using table top high harmonic generation
• Coherent diffractive imaging
• Table top high harmonic generation
• Growth of single crystals of methylammonium lead mixedhalide perovskites
• Growth of single crystals
• Methylammonium lead mixedhalide perovskites
• Organo lead mixed halide perovskites
• Tuning electronic transport properties
• Zigzag graphene nanoribbons
• Stone wales defect
• Negative differential resistance
• Asymmetric and symmetric ZGNRs
• The transmembrane italian mutant
• The temperature replica exchange molecular dynamics
• TmE22K trimer structure
• Kinetics probably yield
• Electrochemical fabrication of hybrid plasmonic dielectric nanomaterials
• Gold diamond clusters
• Hybrid plasmonic dielectric nanomaterials
• hybrid plasmonic dielectric materials
• Electron microscopy and optical characterization
• X ray absorption fine structure
• BCC crystals studied
• High order expanded debye waller factors
• Debye Waller factors
• Temperature dependent cumulants
• Nonlinear optics in waveguide arrays and photonic nanowires
• Nonlinear optics in waveguide arrays
• Diffractive resonant radiation
• The spectral body of the pulse
• Radion production in high energy photon collisions
• Solve the hierarchy problem
• Energy loss function for lead
• Local field effect
• Adiabatic local density approximation
• First principles calculations shows good agreemen
• Perturbative nonlinear optics in the extreme ultraviolet region
• The extreme ultraviolet region
• Different extreme ultraviole
• Multiple cycle pulses
• Thermodynamic hadron quark phase transition
• Chiral nuclear matter to quark gluon plasma
• Quark gluon plasma
• Equilibrium properties near critical points
• Phase transitions and critical phenomena
• Chirality of light in hybrid modes
• Vacuum clad ultrathin optical fibers
• Ultrathin optical fibers
• Superchiral outside the fiber
• An advanced logarithmic phase mask for extending depth
• Field of hybrid optical systems
• Modulation transfer functions
• Hybrid imaging system
• Hyperon W production in pp collisions at energy 8 tev
• Investigate the hadronization process
• The RICH detector
• The nominal value
• Profile of the 12co(3 2) emission line detected
• The debris disc of 49 ceti
• Require relatively violent
• Generate secondary gas
• Synthesis and optical characterization
• Building block plasmonic gold nanostructures
• Random nano islands
• Random Au nano islands
• Electrochemical performance of Na0
• 44Mno2 synthesized
• Hydrothermal method using as a cathode material
• Sodium ion batteries
• Sodium ion battery
• Stable during cycling