Magnetic Properties of Sputter Deposited Rare Earth-Cobalt Permanent Magnets

1973 ◽  
Author(s):  
H. J. Garrett ◽  
W. G. D. Frederick ◽  
Richard P. Allen ◽  
Hugh C. Wolfe ◽  
C. D. Graham ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Permanent Magnets ◽  
Sputter Deposited

Magnetic Properties and Crystallography of Selected Co/Pt Multilayers with Rare-Earth Additions

1993 ◽  
Vol 313 ◽  
Author(s):  
G.A. Bertero ◽  
R.L. White ◽  
R. Sinclair
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Cross Section ◽  
Uniaxial Anisotropy ◽  
Amorphous Film ◽  
Perpendicular Anisotropy ◽  
Grain Sizes ◽  
Transmission Electron ◽  
Rare Earth Additions ◽  
Sputter Deposited

ABSTRACTWe have sputter-deposited a series of Pt/CO Multilayers with differing amounts of rare-earth (RE) in an effort to improve the uniaxial perpendicular anisotropy in these structures. The present work investigates the influence on the magnetic properties of Tb and Ho incorporated both at the interfaces of Pt/CO Multilayers and into the Co layers. The uniaxial anisotropy improved significantly only for those multilayers that showed poor perpendicular anisotropy in the undoped state, in particular, those with large (∼30 Å) bilayer periods. High resolution transmission electron microscopy was used to study these multilayers in cross-section. The Multilayer structures present strong [111] texture with grain sizes ranging from 200 to 600 Å. It is found that the RE does not produce a significant change in the growth texture of the multilayers until a critical amount is introduced beyond which the multilayer structure amorphizes resulting in a compositionally modulated amorphous film.

Microstructure and Magnetic Properties of RE2.28Fe13.58B1.14 Alloys

2016 ◽  
Vol 848 ◽  
pp. 709-714 ◽  
Author(s):  
Gang Fu ◽  
Jiang Wang ◽  
Mao Hua Rong ◽  
Guang Hui Rao ◽  
Huai Ying Zhou
Keyword(s):  
Crystal Structure ◽  
Magnetic Properties ◽  
Rare Earth ◽  
Single Phase ◽  
Permanent Magnets ◽  
Industrial Applications ◽  
Arc Melting ◽  
Light Rare Earth Elements ◽  
Curie Temperatures ◽  
Microstructure And Magnetic Properties

The rare-earth (RE) permanent magnets based on Nd2Fe14B with excellent magnetic properties have been widely used in industrial applications. In this work, the crystal structure, microstructure and magnetic properties of Nd2.28Fe13.58B1.14, Ce2.28Fe13.58B1.14 and Pr2.28Fe13.58B1.14 alloys prepared by arc-melting were investigated. The results show that all alloys are single phase with tetragonal Nd2Fe14B-type (space group P42/mnm). The Curie temperatures (Tc) of RE2.28Fe13.58B1.14 (RE=Nd, Ce, Pr) alloys are 583 K, 423 K and 557 K, respectively. On the other hand, the coercivities of Nd2.28Fe13.58B1.14 and Pr2.28Fe13.58B1.14 alloys are about 1.05 T and 1.23 T, respectively, while that of Ce2.28Fe13.58B1.14 alloy is only about 0.25 T due to the poor squareness of hysteresis loop. Meanwhile, the saturation magnetizations of Nd2.28Fe13.58B1.14 and Pr2.28Fe13.58B1.14 alloys are about 135 emu/g and 113 emu/g, respectively, while that of Ce2.28Fe13.58B1.14 alloy is about 97 emu/g. It was indicated that the Curie temperatures and magnetic properties of RE2.28Fe13.58B1.14 alloys with the same crystal structure are dependent on light rare earth elements.

Magnetic properties of sputter-deposited amorphous rare earth-transition metal thin films

Vacuum ◽  
1988 ◽  
Vol 38 (8-10) ◽  
pp. 797-800 ◽  
Author(s):  
C.E. Davies ◽  
R.E. Somekh ◽  
J.E. Evetts
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Rare Earth ◽  
Transition Metal ◽  
Metal Thin Films ◽  
Sputter Deposited

PrFeB Based Alloys Obtained by Melt Spinning for the Production of Permanent Magnets

2020 ◽  
Vol 1012 ◽  
pp. 314-318
Author(s):  
Marco Antonio Meira ◽  
Lucas Costa Moisés ◽  
Melissa Rohrig Martins da Silva ◽  
Susilene Real Janasi ◽  
Hidetoshi Takiishi
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Powder Metallurgy ◽  
Melt Spinning ◽  
Permanent Magnets ◽  
Wheel Speed ◽  
Essential Components ◽  
Intrinsic Coercivity ◽  
Sintered Permanent Magnets ◽  
Ejection Pressure

Rare earth permanent magnets are essential components in many fields of technology due to their excellent magnetic properties. There are some techniques used in the manufacture of permanent rare earth magnets: the powder metallurgy to obtain anisotropic HD sintered permanent magnets and the melt spinning and HDDR processes to obtain isotropic and anisotropic bonded permanent magnets. In this work, the influence of the melt spinning parameters on the microstructural and magnetic properties of the Pr14FebalCo16B6 alloy was studied. The alloy was melted and rapidly cooled at 9.9 x 105°C/s. The parameters used in the process were: wheel speed of 15 m/s and 20 m/s and ejection pressure of 25.3 kPa and 50.7 kPa. Ribbons and/or flakes of 30 μm thickness and width until 5 mm were obtained. Results show that the melt spinning alloys are nanocrystalline and that the parameters of the process influence the microstructure and their magnetic properties. Mean crystallite size up to 38.5 nm and intrinsic coercivity (iHc) up to 254 kA/m were obtained.

Thermodynamic Calculations of the Rare Earth Permanent Magnets: Fe-RE Binary Systems

2016 ◽  
Vol 850 ◽  
pp. 27-32 ◽  
Author(s):  
Tai Li Chen ◽  
Jiang Wang ◽  
Mao Hua Rong ◽  
Guang Hui Rao ◽  
Huai Ying Zhou
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Phase Equilibria ◽  
Binary Systems ◽  
Permanent Magnets ◽  
Ternary Systems ◽  
Experimental Information ◽  
Industrial Applications ◽  
Thermodynamic Calculations ◽  
The Rare Earth

As the key sub-binary systems in the rare-earth (RE) permanent magnetic materials with excellent magnetic properties (e.g. Nd-Fe-B, Sm-Fe-N magnets), the Fe-RE binary systems were investigated widely due to the industrial applications of permanent magnets. In this work, the experimental data of phase equilibria and thermodynamic properties of the Fe-RE binary systems (RE=La, Ce, Pr, Nd) in the published literature are reviewed firstly. Based on available phase equilibria data and thermodynamic data, the Fe-RE binary systems are assessed thermodynamically using the CALPHAD method. As a result, further experimental information and thermodynamic calculations will be both required in order to develop thermodynamic database of the RE-Fe-B ternary systems, which is very useful to study the relations between alloy composition, microstructure and magnetic properties of novel Nd-Fe-B-based permanent magnets.

Rapidly Solidified Alloys for Permanent Magnets

1985 ◽  
Vol 58 ◽  
Author(s):  
G.C. Hadjipanayis
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Tetragonal Phase ◽  
Permanent Magnets ◽  
Domain Walls ◽  
Partial Substitution ◽  
Melt Spun ◽  
Fine Microstructure ◽  
Rapidly Solidified ◽  
Hard Magnetic Properties

ABSTRACTThe magnetic and structural properties of melt-spun Fe-R-B alloys are reviewed. The hard magnetic properties of these alloys are attributed to the presence of a highly anisotropic tetragonal phase Fe14R2B which in the case of ribbons occurs in very fine grains. The interachoot of domain walls with this fine microstructure leads to the observed high coercivities. The effects of partial substitution of iron, rare-earth and boron on the formation of Fe14R2B and on its magnetic properties are also discussed.

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