Papers & Articles

Synthesis, Microstructure, and Hard Magnetic Properties of Melt-Spun Nd3Fe27.5Ti1.5 and its Nitride
Zhongmin Chen et al | February 2008 | PDF 288K
Nd3Fe27.5Til.5 alloy and its nitride were synthesized using melt-spinning, annealing and nitriding route, and the effects of processing conditions on phase formation, microstructure, and magnetic properties were investigated.

Rare Earth-Fe-B Powder Coating for Improvements in Corrosion Resistance
Peter Guschl et al | October 2005 | PDF 103k
Coating formulations have been investigated for rare-earth Fe-B (RE Fe-B) type melt spun magnetic powders, to provide them with enhanced corrosion and oxidation resistance when exposed to aggressive environments. The coating formulations consist of an epoxy binder-based system and specialty additives.

The Microstructure and Magnetic Properties of Melt-Spun Nanocomposites
Zhongmin Chen et al | October 2005 | PDF 584k
NANOCOMPOSITE RE-Fe-B magnets have attracted much attention in recent years due to their enhanced magnetic performance and potential application in electric motor and sensor devices.

R2Fe14B-Type Isotropic Powders for Bonded Magnets
Peter Campbell et al | August 2004 | PDF 467k
Recent improvements to commercially available rapidly solidified powders for isotropic bonded magnet applications have been reviewed.

The Magnetic Properties and Hot Workability of Rare Earth-Iron-Boride
David Brown et al | July 2004 | PDF 286k 
Hot deformed magnets can be commercially produced from hyper-stoichiometric nanocrystalline Nd-Fe-B compositions. This paper summarizes the influence of the rare-earth component (Nd, Pr, Dy) and gallium to magnetic properties and hot workability of die-upset magnets based upon hyper-stoichiometric compositions.

A Study on the Role of Nb in Melt-spun Nanocrystalline Nd-Fe-B Magnets
Zhongmin Chen et al | 2004 | PDF 612k
The effect of Nb substitution on the thermal stability of melt-spun powders with near stoichiometric 2:14:1 composition of Nd12Fe82 xNbxB6 (x %0; 1.5 and 3) has been investigated.

Metastable Pr2Fe23B3 and its Effect on Magnetic Properties in Pr9Fe91-xBx
Zhongmin Chen et al | September 2003 | PDF 322k
The formation of metastable Pr2Fe23B3 phase and its effect on magnetic properties of melt-spun Pr9Fe91 xBx (x = 4-12) have been investigated.

Developments in the Processing and Properties of NdFeB-type Permanent Magnets
David Brown, Bao-Min Ma, Zhongmin Chen | 2002 | PDF 186k
The composition, microstructure and processing of NdFeB-type permanent magnets are all critical factors for the successful production of high performance magnet components. Three common fabrication routes can be used to categorize these NdFeB-based bulk magnets: sintering, polymer bonding and hot deformation.

In Situ Magnetization of Isotropic Permanent Magnets
Yuriy Zhilichev, Peter Campbell, David Miller | September 2002 | PDF 219k
This paper presents an application of the finite-element method codes developed to design the magnetizing fixtures for isotropic magnets when in situ magnetization is required.

Neo Magnets Boost Fuel Economy
Anthony C. Marcos, Peter Campbell | September 2002 | PDF 92k
As of last year, the average car employed about two dozen electric motors, actuators, and sensors containing permanent magnets. This number is expected to increase to well over 30 by 2005.

Comparing Anisotropic (and Isotropic) Powders for Rare Earth Magnets
David Brown, Bao-Min Ma, Peter Campbell | August 2002 | PDF 276k
Anisotropic rare-earth permanent magnetic powders offer the ability to produce high-energy bonded magnets. Currently, Hydrogenation-Disproportionation-Desorption-Recombination (HDDR) Rare-Earth Iron Boron (RE-Fe-B) and Samarium Iron Nitride (Sm-Fe-N) type powders are available in the marketplace.

Zr Substitution for Rare Earth on Thermal Stability of Melt-spun Powder and Magnets
Zhongmin Chen, Ben Smith, Bao-Min Ma | September 2002 | PDF 236k
The effect of Zr substitution for rare earth on the thermal stability of melt-spun nearstoichiometric 2 : 14 : 1 composition of (NdO 75Pr0 25)12 5 Zr Fe82B5 5 ( = 0 to 3) has been investigated from 20 C to 125 C. 

Zr Substitution for Rare Earth on Microstructure of Melt-spun Ribbons
Zhongmin Chen, Ben Smith, David Brown, Bao-Min Ma | May 2002 | PDF 264k
The effect of Zr substitution for rare earth on the microstructure and hard magnetic properties of melt-spun composition of ~Nd0.75Pr0.25)12.52xZrxFe82B5.5 ~x50-3! has been investigated.

‘Neo’ Magnets Raise the Efficiency of Electric Motors
Anthony C. Marcos, Peter Campbell | February 2002 | PDF 168k
The growing number of electro-mechanical devices employed in today’s automobiles places an increasingly severe load on the alternator.

A Multi-Axis Model of Magnetization for Isotropic Permanent Magnets
Peter Campbell, Yuriy Zhilichev | July 2001 | PDF 68k
An improved model of the isotropic permanent magnet is presented. The model uses different portions of the hysteresis loop in orthogonal directions.

More Powerful Magnetos
January 2001 | PDF 590k
Conventional magnetos are used primarily to generate high voltage for ignition systems in internal· combustion engines.

Understanding Permanent Magnet Materials
S. R. Trout | October 2000 | PDF 164k
The purpose of this paper is twofold. First, to review the basic terminology of permanent magnets and the salient characteristics of four commercially viable families of permanent magnet materials. Second, to examine the methods and references available for teaching the basics of permanent magnets.

Neodymium-Iron-Boron Magnets: Flexibility in Sensor Design
David Miller, Peter Campbell | September 2000 | PDF 1.6mb
The conventional view of permanent magnet materials commonly used in sensors is that if you want low cost you should use ceramic ferrite, and if you want good temperature stability you should use samarium-cobalt.

The Straight Attraction, Part One
Anthony C. Marcos | June 2000 | PDF 592k
Direct-drive linear motors are gaining popularity with motion control system designers and are rapidly replacing traditional rotary-to-linear-motion conversion technologies such as motor/lead screw and belt-drive systems.

The Straight Attraction, Part Two
Anthony C. Marcos | July 2000 | PDF 612k
Direct-drive linear motors are gaining popularity with motion control system designers and are rapidly replacing traditional rotary-to-linear-motion conversion technologies such as motor/lead screw and belt-drive systems.

Comments on Energy Stored in Permanent Magnets
Peter Campbell | January 2000 | PDF 848k
A recent paper on the energy stored in permanent magnets was based upon some erroneous assumptions. These comments are presented in an effort to ex plain a few truths about the energy exchanges in a magnetic circuit containing a permanent magnet.

Effective Use of Neodymium Iron Boron Magnets, Case Studies
S. R. Trout, Yuriy Zhilichev | October 1999 | PDF 76k
Magnets based on neodymium iron boron (NdFeB) alloys have been available for about 15 years, yet many design engineers are frustrated in their attempts to incorporate this material into new devices.