HAL Id: jpa-00219792
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Submitted on 1 Jan 1980
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PROPERTIES OF NON - CRYSTALLINE EuIG AND DyIG OBTAINED FROM MÖSSBAUER AND
MAGNETIZATION MEASUREMENTS
F. Litterst, J. Tejada, G. Kalvius
To cite this version:
F. Litterst, J. Tejada, G. Kalvius. PROPERTIES OF NON - CRYSTALLINE EuIG AND DyIG OB- TAINED FROM MÖSSBAUER AND MAGNETIZATION MEASUREMENTS. Journal de Physique Colloques, 1980, 41 (C1), pp.C1-281-C1-281. �10.1051/jphyscol:1980199�. �jpa-00219792�
JOURNAL DB PHYSIQUE Coiloque C1, suppZ6ment au n O 1 , Tome 41, janvier 1980, page CI-281
PROPERTIES OF NON
-
CRYSTALLINE EuIG AND DyIG OBTAINED FROM &SBAUER AND MAGNETIZATION MEASUREIENTSF.J. Litterst, J. Tejada and G.M. Kalvius
Physik DeparMent der Technischen Vniversittlt MUnchen, D 8046 Gurching, Fed. Rep. Gemany.
Abstract
-
Non-crystalline (nc) EuIG and DyIG have been prepared by dc-sputtering.Mbssbauer data on 57?3e, 1513u and 161~y reveal sharp magnetic transitions at T m = 62 K and
70
K for nc EuIG and DyIG, respectively. The 5 7 ~ e hyperf ine (hf) spectra consist of three superpositioned patterns for ?3e3+ in tetrahedral and octahedral and for 2e2+in tetrahedral oxygen coordination. The saturation hf fields are reduced compared to the values of the corresponding crystalline materials. The induced hf field at 15'~u is only 1/8 of that for crystalline EuIG. The microchemical composition and structure
bf the ac materials can be satisfactorily explained by a small oxygen deficiency due to preferential oxygen sputtering. Macroscopic magnetization suggests ferrimagnetic order possibly of sperimagnetic type. Although a part of the deviations of the mag- netic hf parameters from the values for the corresponding crystalline substances can be explained by a distribution in the molecular field, the strong reduction of Tm must be attributed to a decrease of the average molecular field due to the distorted superexchange bonds.
A complete description of the subject will be published in J. Appl. Phys. (1979).
Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1980199
