High-temperature magnetic properties of mechanically alloyed SmCo5 and YCo5 magnets

The high-temperature coercivity of mechanically alloyed and subsequently annealed RCo 5 (R=Sm and Y) is studied. The annealed materials have the hexagonal CaCu 5 structure with 2:17 (or 1:7) regions as a minor phase. High-temperature magnetic measurements show that the coercivities of materials decr...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2001-07, Vol.37 (4), p.2534-2536
Main Authors: Al-Omari, I.A., Skomski, R., Thomas, R.A., Leslie-Pelecky, D., Sellmyer, D.J.
Format: Article
Language:English
Subjects:
Anisotropic magnetoresistance
Annealing
Applied sciences
Coercive force
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Magnetic anisotropy
Magnetic materials
Magnetic properties
Magnetic properties and materials
Magnets
Metals. Metallurgy
Permanent magnets
Perpendicular magnetic anisotropy
Physics
Powders
Studies of specific magnetic materials
Temperature
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Summary:The high-temperature coercivity of mechanically alloyed and subsequently annealed RCo 5 (R=Sm and Y) is studied. The annealed materials have the hexagonal CaCu 5 structure with 2:17 (or 1:7) regions as a minor phase. High-temperature magnetic measurements show that the coercivities of materials decrease with increasing temperature from room-temperature to 873 K, but that the temperature coefficient of the coercivity of YCo 5 is much smaller than that of SmCo 6 . This behavior is explained in terms of the intrinsic temperature variation of the magnetocrystalline anisotropy.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.951226