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Radiation Effects in Rare-Earth Permanent Magnets

Published online by Cambridge University Press:  25 February 2011

J. R. Cost ,
R. D. Brown ,
A. L. Giorgi  and
J. T. Stanley
J. R. Cost
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
R. D. Brown
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
A. L. Giorgi
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
J. T. Stanley
Affiliation:
Chemical and Materials Science Engineering Dept., Arizona State University, Tempe, AZ 85287
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Abstract

Nd-Fe-B and Sm-Co permanent magnets have been irradiated with fission neutrons and gamma rays. Irradiated samples were periodically removed for room temperature measurements of the open-circuit remanence. Hysteresis loops were measured before and after irradiation. For neutron irradiation, two Nd-Fe-B magnets showed a rapid loss of remanence, while a third magnet from another manufacturer decayed more slowly, suggesting that the radiation hardness of Nd-Fe-B magnets may depend on microstructural details. Irradiation in the Omega West Reactor at Los Alamos with fast neutrons caused the fast-decay samples to have an Wtial loss of remanence of 1% for irradiation at 350 K to a fluence of 1015 n/cm2. Both SmCo5 and Sm2Co17 magnets showed excellent resistance to radiatifg-induied loss of remanence for neutron irradiation to a fluence of 2.6×1018 n/cm2. Results for gamma radiation showed no loss of remanence for a dose of about 49 Mrad using a 60Co source. Possible mechanisms for radiation-induced loss of magnetic properties are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 96: Symposium F – High Performance Permanent Magnet Materials , 1987 , 321
Copyright
Copyright © Materials Research Society 1987

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References

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