Spin-wave resonance in thin films of nickel-cobalt alloys

Spin-wave resonance has been observed at 9 GHz in thin films of Ni-Co alloys containing between 0 and 40% Co at temperatures between 4.2K and room temperature. The dispersion relationship, critical angle, linewidth and annealing results suggest that the surface spins are pinned by a surface layer about 100 AA thick. The exchange stiffness constant is found to have a value about a quarter of that obtained by other methods, namely approximately 100 meV A2.

[1]  D. Edwards,et al.  The spin wave stiffness constant in ferromagnetic partially ordered alloys , 1978 .

[2]  I. Cullis,et al.  The critical angle in NiCo films , 1978 .

[3]  I. Cullis,et al.  Spin wave resonance in NiCo films , 1977 .

[4]  J. Jankowska,et al.  Influence of atomic ordering on the spin waves in Ni0.75Fe0.25 alloy , 1977 .

[5]  Hiroshi Watanabe,et al.  Exchange Stiffness Constants in Ni-Co Alloys , 1976 .

[6]  D. Edwards,et al.  Theory of the spin wave stiffness constant in ferromagnetic transition metal alloys , 1976 .

[7]  Z. Frait,et al.  Frequency dependence of the parallel and perpendicular ferromagnetic resonance linewidth in Permalloy films, 2‐36 GHz , 1975 .

[8]  H. Puszkarski.  Surface modes in magnetic thin films and in spin wave resonance , 1973 .

[9]  J. Witters,et al.  Exchange constants in nickel-cobalt alloys from standing spin wave resonance , 1972 .

[10]  C. Vittoria,et al.  Resonance linewidth dependence on film thickness , 1971 .

[11]  E. Wohlfarth,et al.  CALCULATION OF THE SPIN WAVE ENERGY OF IRON, COBALT AND NICKEL , 1971 .

[12]  G. Lykken.  Standing Spin-Wave Resonance in "Flash-Evaporated" Permalloy Films , 1967 .

[13]  E. N. Mitchell,et al.  Spin-Wave Resonance of Permalloy Thin Films as Measured in Ultrahigh Vacuum and in Air , 1966 .

[14]  T. Phillips.  Spin wave resonance in iron , 1966, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[15]  P. Wigen,et al.  Evidence of Unpinned Surface Spins from Parallel Spin‐Wave Resonances in Permalloy Films , 1964 .

[16]  T. Rossing,et al.  Dynamic Pinning in Thin-Film Spin-Wave Resonance , 1962 .

[17]  H. Nosé.  Spin Wave Resonance in Ni Films , 1960 .

[18]  J. Jankowska,et al.  Spin waves in fcc NiCo alloys by neutron spectrometry , 1977 .

[19]  P. Tannenwald,et al.  INTENSITIES OF SPIN‐WAVE RESONANCE MODES IN THIN FILMS , 1970 .