Premium
Flat Ferromagnetic, Epitaxial 48Ni/52Fe(111) Films of few Atomic Layers
Author(s) -
Gradmann U.,
Müller J.
Publication year - 1968
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.19680270133
Subject(s) - condensed matter physics , ferromagnetism , materials science , magnetization , curie temperature , anisotropy , epitaxy , superparamagnetism , magnetic anisotropy , magnetic moment , magnetic field , optics , nanotechnology , physics , layer (electronics) , quantum mechanics
Flat epitaxial 48Ni/52Fe(111) films are prepared by evaporation onto atomically flat Cu(111) films. All films consisting of three or more layers (d ≧ 6 Å) show a far‐reaching fit to the model structure of a flat single crystal. The magnetic properties are determined for (70 ≦ T ≦ 400) °K with an oscillation type torsion magnetometer, which can detect a moment of 5 × 10 −8 G cm 3 . All films of three or more layers are ferromagnetic without any indication of superparamagnetism; Curie‐temperature and magnetization decrease monotonously with film thickness; there is good qualitative agreement with spin‐wave theory and Green's function theory; the magnetization is independent of the field, however, within 1%, for (300 ≦ H ≦ 5000) Oe, while the theory predicts considerable dependence on the field. Strong anisotropies relating to the surface normal as easy axis may easily be interpreted as Néel‐type surface anisotropies.