Long magnetic relaxation time of Fe-Bi spin-glass system

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:226

Article; Proceedings Paper

Hsu, JH ; Lee, JT ; Chang, CR ; Lin, MT

关键词: magnetic relaxation;    metastable;    spin-glass;    spin-orbit splitting;   

DOI  :  10.1016/S0304-8853(00)00988-4

来源: Elsevier

【 摘 要 】

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 spin-glass results with the freezing temperature increasing with x. In addition. a long relaxation characteristic time tau is observed which is about 20 h 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. (C) 2001 Elsevier Science B.V. All rights reserved.

【 授权许可】

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