Radiation-induced changes in magnetic properties of Nd-Fe-B permanent magnets

Small magnets were irradiated in a fast neutron flux of 4*10/sup 12/ n/cm/sup 2/-s at 350 K (77 degrees C). At various time intervals during the irradiation, samples were removed from the reactor and the open-circuit remanence was measured. It is shown that the rate of remanence decay decreases mono...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1989-07, Vol.25 (4), p.3117-3120
Main Authors: Brown, R.D., Cost, J.R.
Format: Article
Language:English
Subjects:
360104 - Metals & Alloys- Physical Properties
360106 - Metals & Alloys- Radiation Effects
430300 - Particle Accelerators- Auxiliaries & Components
440200 - Radiation Effects on Instrument Components, Instruments, or Electronic Systems
Accelerator magnets
ACCELERATORS
ALLOYS
Applied sciences
BARYONS
BORON ALLOYS
Coercive force
Electrical engineering. Electrical power engineering
ELEMENTARY PARTICLES
Exact sciences and technology
FAST NEUTRONS
FERMIONS
HADRONS
Inductors
INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
IRON ALLOYS
Magnetic materials
MAGNETIC PROPERTIES
Magnetization
MAGNETS
MATERIALS SCIENCE
NEODYMIUM ALLOYS
NEUTRON FLUX
NEUTRONS
NUCLEONS
OMEGA FACILITY
PARTICLE ACCELERATORS
PERMANENT MAGNETS
PHYSICAL PROPERTIES
PHYSICAL RADIATION EFFECTS
Proton accelerators
RADIATION EFFECTS
RADIATION FLUX
RADIOSENSITIVITY
RARE EARTH ALLOYS
Remanence
VARIATIONS
Various equipment and components
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Summary:Small magnets were irradiated in a fast neutron flux of 4*10/sup 12/ n/cm/sup 2/-s at 350 K (77 degrees C). At various time intervals during the irradiation, samples were removed from the reactor and the open-circuit remanence was measured. It is shown that the rate of remanence decay decreases monotonically with increasing length-to-diameter (L/D) ratio for samples of the same material. Samples of different materials having an L/D ratio of 4.4. were irradiated to study the decay of the remanence. It is shown that resistance to radiation-induced decay is improved by the substitution of Dy or Tb for Nd. The results also show that the sensitivity to radiation varies widely among magnets from different vendors. Possible reasons for this variation are discussed.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.34383