Accession Number : ADA131961

Title :   Anisotropy and Microstructure of Sm2(Co,Fe,Cu,Zr)17 Magnetic Materials.

Descriptive Note : Final rept. Jan 82-Jan 83,


Personal Author(s) : Fidler,Josef ; Grossinger,Roland ; Kirchmayr,Hans ; Skalicky,Peter

Report Date : MAY 1983

Pagination or Media Count : 135

Abstract : The present report is divided into two parts, the anisotropy measurements and the microstructural investigations of Sm2(Co,Fe,Cu,Zr)17 magnetic materials. Section I shows that the pulsed field technique is a versatile extension of a static magnetometer. Beside the possibility of generating fields up to 280 k theta e it can be used an an instrument with specific possibilities. An example for this is the SPD-technique which delivers even for polycrystalline samples - a value for the anisotropy field Ha. Up to now no clear correlation between the magnetic parameters like coercivity or energy product and the absolute value of Ha is possible. However, the knowledge of Ha allows the application of models which may help to understand the occurrence of these parameters. The temperature dependence of Ha should be mainly determined by the temperature dependence of the magnetization of the Sm sublattice. If this is known the validity of the One Ion Model can be tested. The role of the partly substituted Co sublattice is not so clear. More accurate M(T) measurements should be done. The influence of the inter-atomic distance on Ha(T), which should exist according to to an extended One Ion model, necessitates the knowledge of the thermal expansion.

Descriptors :   *Samarium compounds, *Magnetic materials, *Anisotropy, *Microstructure, Cobalt, Iron, Copper, Zirconium, Magnetic fields, Pulses, Electron microscopy, Magnetization, Structural analysis

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE