Hydrogen absorption property and magnetism of SmFeA1 and its hydrides

Magnetic properties of SmFeAl and its hydrides synthesized at 298-673 K under 40 bar hydrogen pressure were investigated by a superconducting quantum interference device (SQUID) from 4.2 to 300K. SmFeAl and its hydrides have a mictomagnetic transition during the field-cooled process. In both SmFeAl and its hydrides, a shifted magnetic hysteresis cycle towards positive magnetization was observed. But when SmFeAlHx, decomposes completely into SmHx, and Fe-Al alloy, this special transition disappears. (c) 2005 Elsevier B.V. All rights reserved.Materials Science, MultidisciplinaryPhysics, Condensed MatterSCI(E)EI0ARTICLE2297-30130