Abstract
Using polarised neutrons, the full three-dimensional magnetic structure amplitudes in the Ni1−c Ru c single crystals forc = 0·027, 0·033 and 0·046 were measured. Moment density maps in various portions of the Wigner-Seitz cell were obtained. It is seen from these maps that unlike Ni-based alloys with 3d impurities, the introduction of Ru to the Ni matrix produces extensive perturbations in the diffuse moment density, giving rise to a netpositive diffuse moment which tends to increase with Ru concentration. The asphericity of the host moment at first increases and then decreases with increasing Ru content. Another significant outcome of the present study is the evidence for the reversal of the sign of the Ru moment, from negative to positive, obtained by comparing the shape of the spherical site form factors of the three-alloy concentrations with the Ni spherical form factor itself. The sign reversal of the impurity moment is confirmed by the form factor analyses. Strong local environmental effects seem to play a major role in this alloy system.
Similar content being viewed by others
References
Cable J W, Wollan E O, Felcher G P, Brun T O and Hornfeldt S P 1975Phys. Rev. Lett. 34 278
Cadeville M C and Roussel J 1971J. Phys. F1 686
Chakravarthy R and Madhav Rao L 1980 (to be published)
Comly J B, Holden T M and Low G G 1968J. Phys. C1 458
Dobrzynski L, Maniswski F, Modrzewski A and Sikorsk D 1970Phys. Status Solidi 28 103
Durand J and Gautier F 1970J. Phys. Chem. Solids 31 2773
Ito Y and Akimitsu J 1974J. Phys. Soc. Jpn. 36 431
Kitaoka Y and Asayama K 1976J. Phys. Soc. Jpn. 40 1521
Livet F and Radhakrishna P 1976Solid State Commun. 18 331
Madhav Rao L, Chakravarthy R, Jirak Z and Satya Murthy N S 1978Phys. Rev. B18 6275
Mook H A 1966Phys. Rev. 148 495
Moon R M 1964Phys. Rev. 136 A195
Moon R M 1971Int. J. Magn. 1 219
Parette G and Kajzar F 1979J. Phys. F9 1807
Shull C G and Yamada Y 1962J. Phys. Soc. Jpn. Suppl. 17 1.
Watson R E and Freeman A J 1961Acta Crystallogr. 14 27.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Chakravarthy, R., Rao, L.M. & Satya Murthy, N.S. Magnetic moment distributions and form factors in ferromagnetic nickel-ruthenium alloys. Pramana - J. Phys. 15, 207–223 (1980). https://doi.org/10.1007/BF02848255
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02848255