Direct synthesis and optimization of Fe based rare earth transition metal permanent magnet systems: Progress report, August 1, 1987-March 31, 1988

Technical Report · Wed Mar 23 00:00:00 EST 1988

OSTI ID:5156418

Cadieu, F J

High coercive force rare earth transition metal permanent magnet systems are being either directly synthesized onto heated substrates or subsequently crystallized from thick films originally deposited in an amorphous form. Generally thick films have been prepared by RF sputtering from a set of three targets so that films with or without a composition gradient along the length of the substrates can be created. For gradient composition films, a detailed, reproducible, and systematic study of the entire phase field of a system can be studied by observing separate regions of a single substrate. Normally films have been synthesized with an applied magnetic field of 2.5 kOe in the plane of the substrates during the sputter deposition. This has allowed special anisotropies to be introduced into the growing films. By employing what we term selectively thermalized sputtering the desired phases can be directly synthesized onto heated substrates so that the samples are highly textured. For example, films of the SmCo/sub 5/ compound can be synthesized with either a (200) or (110) predominant crystal texturing. The intrinsic coercive forces, /sub i/H/sub c/, of these differently textured films are very different. For the (110) textured SmCo/sub 5/ films /sub i/H/sub c/ values of 23 kOe have been observed for a sputtered films without any subsequent heat treatments. In the film plane static energy products the order of 20 MG)endash)Oe have been observed for a number of different crystal texturing so that films exhibit either an easy magnetic axis in the film plane or perpendicular to the film plane depending upon whether the c-axis is predominantly textured into or out of the film plane

• Research Organization: Queens Coll., Flushing, NY (USA). Dept. of Physics; City Univ. of New York, NY (USA). Research Foundation
• DOE Contract Number: FG02-86ER45265
• OSTI ID: 5156418
• Report Number(s): DOE/ER/45265-T1; ON: DE88007686
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
PERMANENT MAGNETS
RESEARCH PROGRAMS
CRYSTAL LATTICES
MAGNETIC PROPERTIES
OPTIMIZATION
PROGRESS REPORT
RARE EARTH ALLOYS
SPUTTERING
SYNTHESIS
X-RAY EMISSION ANALYSIS
ALLOYS
CHEMICAL ANALYSIS
CRYSTAL STRUCTURE
DOCUMENT TYPES
MAGNETS
NONDESTRUCTIVE ANALYSIS
PHYSICAL PROPERTIES
656002* - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-)
360104 - Metals & Alloys- Physical Properties