Variation of magnetization and the Landé g factor with thickness in Ni–Fe films

Nibarger, J. P.; Lopusnik, R.; Celinski, Z.; Silva, T. J.
July 2003
Applied Physics Letters;7/7/2003, Vol. 83 Issue 1, p93
Academic Journal
We have measured the Lande g factor, the effective magnetization M[SUBeff], the uniaxial anisotropy H[SUBk], and the Gilbert damping parameter α, as a function of Permalloy film thickness from 2.5 to 50 nm. We used a pulsed inductive microwave magnetometer capable of generating dc bias fields of 35.2 kA/m (440 Oe). A significant decrease in g is observed with decreasing thickness below 10 nm. Also, M[SUBeff] decreases with decreasing thickness consistent with a surface anisotropy constant of 0.196±0.025 mJ/m[SUP2]. The decrease in g can arise from the orbital motion of the electrons at the interface not being quenched by the crystal field. We also compare our data to a model of an effective g factor suggesting that the decrease in g factor might also stem from the Ni-Fe interface with a Ta underlayer.


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