Onset of magnetism in concentrated ternary alloys I |
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Authors: | G. Hilscher |
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Affiliation: | Institut für Experimentalphysik, T.U. Wien, Karlsplatz 13, 1040 Vienna, Austria |
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Abstract: | The onset of magnetism and the magnetic propreties of concentrated substitutional ternary alloys A(Fe1?xBx)2 (A = Y, Zr, U; B = Mn, Co, Ni and Al), Y2(Ni1?xCox)7, Y(Ni1?xCox)3, Y6(Fe1?xMnx)23 and Ti(Fe1?xCox) as well as the amorphous alloy system (Fe1?xNix)77Si10B13 are discussed in terms of homogeneous and heterogeneous models based on the Stoner-, Edwards- Wohlfa arth- and the Landau theory of phase transitions of second order. For a detailed comparison of the nine ternary systems A(Fe, B)2 (A = Y, Zr, U; B = Mn, Co, Al) we refer to a following paper. From the results obtained on alloying UNi2 with Fe, Co and Cu we propose that the magnetic moment of UNi2—contrary to UFe2—resides mainly on U rather than on the Ni site. The appearance of magnetism in YNix compounds by either changing the Y : Ni ratio or substituting Ni by Co in YNi3 and Y2Ni7 is mainly attributed to band effects for which a schematic N(E) curve is proposed. The breakdown of long-range magnetic order in Y6(Fe, Mn)23 seems to be caused by a lack of delocalized electrons and a preferential site occupation of Mn and Fe. The magnetic properties of Ti(Fe1?xCox) change from an itinerant to a localized moment behaviour above and below x = 0.5 due to the occurrence of Fe antistructure atoms which drive the onset of long-range magnetic order. The occurrence of magnetism in amorphous alloys compared with that of crystalline alloys with a high degree of disorder may be characterized in a similar way. |
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