Magnetic properties of amorphous neodymium–transition-metal films
- 1 May 1978
- journal article
- research article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 49 (5), 2885-2893
- https://doi.org/10.1063/1.325172
Abstract
Amorphous thin films of NdxCo1−x and NdxFe1−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 NdxCo1−x alloys and to 25% of its free‐ion moment in NdxFe1−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, Ku=CM2Nd. C was exponentially dependent on concentration according to the relation C=6 exp(−10x).Keywords
This publication has 21 references indexed in Scilit:
- Galvanomagnetic effects in amorphous film alloysIEEE Transactions on Magnetics, 1977
- Magnetic properties of amorphous metallic alloys containing rare earth impuritiesJournal of Physics F: Metal Physics, 1977
- Magnetic Properties of Amorphous Dy-Fe Alloy FilmsJapanese Journal of Applied Physics, 1976
- Magnetic Structure of an Amorphous Rare-Earth Transition-Metal AlloyPhysical Review Letters, 1976
- Thermomagnetic Writing in Tb-Fe FilmsJapanese Journal of Applied Physics, 1976
- Anomalous magnetization of amorphous Tb, Gd, and YPhysical Review B, 1974
- Magnetic Properties of Ho-Co and Ho-Fe Amorphous FilmsPhysical Review Letters, 1974
- Role of structure in amorphous magnetic materials: Dense random packing of hard spheres of two sizesJournal of Non-Crystalline Solids, 1974
- Mossbauer effect investigation of Y-Fe compoundsJournal of Physics F: Metal Physics, 1974
- New Model for Amorphous MagnetismPhysical Review Letters, 1973