Ni-Fe/25 at%Ni-Mn膜の交換結合に及ぼす界面ガス吸着の影響 (<特集>多層膜・人工格子・グラニューラー)

概要

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The effect of gas adsorption onto the interface on the exchange-coupling field of Ni-Fe/25 at%Ni-Mn film was investigated. Ni-Fe/25 at% Ni-Mn/Ni-Fe trilayer films were prepared on an Si(100) substrate by a facing-targets sputtering method. The lower interface of trilajer films was exposed for 1 hour in varlous atmosbheres controlled by introducing air or N_2 throuth a variable leak valve. The strength of the exchange coupling, J_k, decreased rapidly when the air pressure during exposure exceeded 1×10^<-7> Torr. From the temperature dependence of J_k and crosssectional TEM observation, it was found that γ-Ni-Mn became easy to separate into α-Mn+θ-NiMn with increasing air pressure, leading to the decrease in J_k at R.T. This structural change in Ni-Mn layer was considered to be caused by the H_2O/O_2 gas adsorption or partial oxidation on the lower Ni-Fe surface, preventing epitaxial growth of γ-Ni-Mn grain on it.
社団法人日本磁気学会の論文
1997-04-15