Magnetic properties and crystallization behavior of Al–Co–Ce(Dy) amorphous ribbons

Abstract Magnetic and electric properties as well as the structure (by X-rays) and DSC of Al 91 Co 2 Ce 7 and Al 89 Co 5 Dy 6 alloys in amorphous and crystalline states are studied. For both ribbons crystallization goes into two stages. In case of Al 91 Co 2 Ce 7 composition it starts with the formation of Al nanoparticles; after that Al 11 Ce 3 and Al 9 Co 2 compounds appear. For Al 89 Co 5 Dy 6 ribbon the situation is vice versa – the crystallization of Al 3 Dy compound takes place at the first stage whereas crystallization of aluminum matrix arises at the second stage only. The effective magnetic moments per Ce (Dy) atoms were found to be smaller than for R 3+ ions suggesting that rare-earth atoms create directed bonds with aluminum atoms.