Radiation effects in rare-earth permanent magnets. [Nd-Fe-B; Sm-Co]

Conference · Thu Jan 01 00:00:00 EST 1987

OSTI ID:6605354

Cost, J R; Brown, R D; Giorgi, A L; Stanley, J T

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 magnets showed a rapid loss of remanence, while a third decayed more slowly. Irradiation in the Omega West Reactor at Los Alamos with fast neutrons caused the fast-decay samples to have an initial loss of remanence of 1% for irradiation at 350 K to a fluence of 10/sup 15/ n/cm/sup 2/. Both SmCo/sub 5/ and Sm/sub 2/Co/sub 17/ magnets showed excellent resistance to radiation-induced loss of remanence for neutron irradiation to a fluence of 2.6 x 10/sup 18/ n/cm/sup 2/. Results for gamma irradiation are presented and discussed in terms of possible mechanisms for radiation-induced loss of magnetic properties.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Arizona State Univ., Tempe (USA). Dept. of Chemical, Bio and Materials Science Engineering
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 6605354
• Report Number(s): LA-UR-87-1455; CONF-870438-6; ON: DE87009013; TRN: 87-018415
• Resource Relation: Conference: Spring meeting of the Materials Research Society, Anaheim, CA, USA, 21 Apr 1987; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON ALLOYS
PHYSICAL RADIATION EFFECTS
COBALT ALLOYS
IRON ALLOYS
NEODYMIUM ALLOYS
PERMANENT MAGNETS
SAMARIUM ALLOYS
GAMMA RADIATION
MAGNETIC PROPERTIES
NEUTRONS
ALLOYS
BARYONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FERMIONS
HADRONS
IONIZING RADIATIONS
MAGNETS
NUCLEONS
PHYSICAL PROPERTIES
RADIATION EFFECTS
RADIATIONS
RARE EARTH ALLOYS
360106* - Metals & Alloys- Radiation Effects