T.R. McGuire, T.S. Plaskett
Journal of Applied Physics
Amorphous thin films of NdxCo1-x and Nd xFe1-x alloys were prepared over the compositional range 0.08≤x≤0.71 by e-beam evaporation. Magnetization and anisotropy of the samples were studied over a wide temperature range with the aid of a force balance magnetometer, Hall effect measurements, and Mössbauer spectroscopy. It was found that the magnetization of the alloys could not be accounted for by a completely collinear alignment (ferromagnetic) of the Nd and transition-metal subnetworks. Mean field analysis of the magnetization data showed a large reduction of the Nd-transition-metal exchange coupling as compared to their Gd analogs. A model was developed which requires that Nd be dispersed in a cone whose axis is parallel to that of the transition-metal subnetwork by strong coupling to randomly oriented local crystal field axes. This dispersion reduces the Nd net moment to 77% of its free-ion moment in NdxCo 1-x alloys and to 25% of its free-ion moment in NdxFe 1-x alloys. There is evidence that some dispersion also occurs in the Fe subnetwork. Anisotropy in NdxCo1-x alloys was found to be proportional to the square of the Nd subnetwork magnetization, K u=CM2Nd. C was exponentially dependent on concentration according to the relation C=6 exp(-10x).
T.R. McGuire, T.S. Plaskett
Journal of Applied Physics
R.J. Gambino, T.R. McGuire
IEEE Transactions on Magnetics
R.C. Taylor, J.F. Woods, et al.
Journal of Applied Physics
X.W. Li, A. Gupta, et al.
Journal of Applied Physics