Long magnetic relaxation time of Fe-Bi spin-glass system
Journal
Journal of Magnetism and Magnetic Materials
Journal Volume
226
Pages
502-504
Date Issued
2001
Author(s)
Abstract
Bi and Fe are mutually insoluble either in the solid or liquid states. However, metastable Fe–Bi alloys can be made using the rapidly quenching method. We have successfully prepared metastable FexBi1−x alloys over a wide composition range by DC magnetron co-sputtering. The X-ray diffraction results indicate that the magnetic Fe atoms are gradually replacing the Bi atoms in a rhombohedral structure for x < 0.6. The magnetic measurements show that a spinglass results with the freezing temperature increasing with x. In addition, a long relaxation characteristic time τ is observed which is about 20h at room temperature. The slow relaxation behavior of the Fe–Bi system can be qualitatively explained from the picture that Bi has a large spin–orbit splitting. © 2001 Elsevier Science B.V. All rights reserved.
Type
journal article