Volume 137, Issue 2 pp. 487-493
Original Paper
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The Intersublattice Molecular Fields in the Rare Earth–Cobalt Intermetallics

R. J. Radwański

R. J. Radwański

Solid State Physics Department, University of Mining and Metallurgy, Cracow

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First published: 1 October 1986
Citations: 35

30–059 Cracow, Poland.

Abstract

en

The value of 9.27 × 10−23 J for the exchange coupling parameter between the Ho and Co spins in Ho2Co17 has been derived. Some experimental evidence is given to show that the R–T spin coupling parameter is rather insensitive to the kind of the rare earth atom as well as on the cobalt composition. It allows to calculate the intersublattice molecular fields for the rare earth–cobalt intermetalic compounds. This field affects the R magnetic moment and originates from the Co sublattice in the R2Co17, RCo5, R2Co7, RCo3, and RCo2 compounds. The fields in the new magnetic materials of the R2Co14B type have also been evaluated.

Abstract

de

Es wird ein Wert von 9,27 × 10−23 J für den Austauschparameter zwischen den Ho- und Co-Spins in Ho2Co12 ermittelt. Aus experimentellen Daten wird geschlossen, daß der R–T-Spinkopplungsparameter relativ unempfindlich gegenüber der Art der Seltenen Erde und dem Kobaltgehalt ist. Dies gestattet, die molekularen Felder der Untergitter für die intermetallischen Verbindungen zwischen Seltenen Erden und Kobalt zu berechnen. Diese Felder beeinflussen das magnetische Moment der Seltnen-Erd-Atome und rühren von dem Co-Untergitter in den Verbindungen R2Co17, RCo5, R2Co7, RCo3 und RCo2 her. Die Felder in den neuen magnetische Materialien vom Typ R2Co14B werden ebenfalls berechnet.

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