Magnetic properties of iron sulfides doped with 3d transition-metals studied by Mo˝ssbauer spectroscopy
✍ Scribed by Hyo Duk Nam; Eng Chan Kim; Sung Hyun Lee; Jong Soo Han
- Publisher
- Elsevier Science
- Year
- 2005
- Tongue
- English
- Weight
- 160 KB
- Volume
- 362
- Category
- Article
- ISSN
- 0921-4526
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✦ Synopsis
It is found by M +
ossbauer measurements on M 0.025 Fe 0.975 S (M ¼ Sc, Ti, V, Cr, Mn, Co, Ni, Cu) that the 3d transition-metal impurities influence the spin reorientation transitions of iron sulfide. It is noteworthy that both V 0.025 Fe 0.975 S and Co 0.025 Fe 0.975 S have Morin transition temperatures T M which are distinctly different from that of FeS; furthermore, the directions of the T M changes are opposite for V 0.025 Fe 0.975 S and Co 0.025 Fe 0.975 S. However, it is found that both the Ne´el temperature T N and the a-transition temperature T a are almost unaffected by the 3d transition-metal impurities. A vanadium impurity of 2.5% of the metal atoms in the iron sulfide makes the crystallographic transition take place rapidly in a narrow temperature region of about 15 K, while the a transition in FeS takes place over a wide temperature range of about 200 K. It is also found that the a transition for V 0.025 Fe 0.975 S has a hysteresis width of 5 K.