Abstract
The results of magnetic measurements and ferromagnetic resonance studies performed on U(Fe x Al1−x )2 and U(Fe y Ni1−y )2 compounds over a large temperature range are reported. The saturation magnetization decreases nearly linearly when substituting Fe by Al or Ni. In the composition range x<0.84 and y<0.81, the compounds are Pauli paramagnets, except in the region with y≲0.10. For UNi2 two types of magnetic behaviours are shown. This compound can be both a ferromagnet withT c =23.5 K and a Pauli paramagnet, depending on the crystal structure. Above the Curie temperatures, the reciprocal susceptibility for the compounds with x>0.84 and y>0.81 obeys a temperature dependence of the formX=X o+C(T-θ) −1. The effective iron moments decrease when substituting iron by nickel or aluminium. The ferromagnetic resonance measurements show that theg values are not composition-dependent. A linear variation of the mean iron magnetization with the exchange field is observed. Finally, the magnetic behaviour of iron in these compounds is analysed.
Similar content being viewed by others
References
M.B. Brodsky: Rep. Prog. Phys.41, 1457 (1978)
G. Hilscher: J. Magn. Magn. Mat.27, 1 (1982)
G.M. Brooks, G.S. Williams, E.M. Smith: J. Inst. Metals83, 271 (1954)
V.A. Pletyushkin, V.I. Chechernikov, U.V. Muzaleva, V.A. Semenov, R.N. Kuzmin, U.K. Slovyanski: Fiz Metall Metallov.39, 217 (1975)
J. Hrebik, B.R. Coles: J. Magn. Magn. Mat.15–18, 1255 (1980)
E. Burzo, M. Valeanu: J. Phys. F10, L329 (1980)
E. Burzo, M. Valeanu: J. Phys. F12, 3105 (1982)
G. Hilscher, V. Sechovsky: Solid State Commun.40, 881 (1982)
J.M. Fournier: One day meeting on Magnetism of Actinides, Bedford College Dec. 1980) quoted in [7]
M.K. Fayek, A.A. Bahgat, A. Eltawansi: Appl. Phys. A26, 175 (1981)
L. Néel: J. Phys. Rad.9, 185 (1984)
G.H. Lander, A.T. Aldred, B.D. Dunlap, G.K. Shenoy: Physica B+C86–88, 152 (1977)
D.F. Bates:Modern Magnetism (Cambridge University Press, Cambridge 1962) p. 133
E. Burzo, M. Valeanu: J. Magn. Magn. Mat.31–34, 257 (1983)
J.O. Artman: Phys. Rev.105, 74 (1957)
E. Burzo, I. Ursu: Bull. Magn. Res.2, 240 (1980)
C.G. Robbins, H. Claus, R.P. Beck: Phys. Rev. Lett.22, 1937 (1969)
E. Burzo, I. Lupşa: Solid state Commun.42, 369 (1982)
E. Burzo, I. Lupşa, I. Cosma: Phys. Stat. Solidi (a)77, 127 (1983)
J. Azoulay, J. Ley: Solid State Commun.31, 131 (1979)
E. Burzo: J. Phys. F10, 2025 (1980)
E. Burzo: Solid State Commun.20, 567 (1976)
E. Burzo, I. Ursu: J. Appl. Phys.50, 1471 (1979)
E. Burzo: J. Less Common. Met.77, 251 (1981)
E. Burzo, D.P. Lazar, M. Ciorascu: Phys. Stat. Solidi (b)65, K145 (1974)
J.J.M. Franse, P.H. Frings, F.R.de Boer, A. Menovsky: Conf. on Solids under High Pressure, Bad Honnef (1981) cited in [8]
I. Lupşa, E. Burzo: J. Magn. Magn. Mat.37, 147 (1983)
E. Burzo, I. Lupşa: Phys. Stat. Solidi (a)82, K49 (1984)
E. Burzo, M. Valeanu: Rev. Roum. Phys.29 (1984) in press
P. Rhodes, E.P. Wohlfarth: Proc.R.Soc.(London)A273, 247 (1963)
E. Burzo: Phys. Rev. B17, 1414 (1978)