Magnetic properties of Cr-Fe-Mn alloys
文献类型：期刊论文
| 作者 | Li, B ; Alberts, HL ; Strydom, AM ; Wu, BM ; Prinsloo, ARE ; Chen, ZJ |
| 刊名 | JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
 |
| 出版日期 | 2009 |
| 卷号 | 321期号:2页码:61 |
| 关键词 | GIANT MAGNETORESISTANCE TRANSPORT-PROPERTIES RELAXATION DYNAMICS CRFEMN ALLOYS SPIN-GLASS HEAT EVOLUTION ORDER FERROMAGNETISM TEMPERATURE |
| ISSN号 | 0304-8853 |
| 通讯作者 | Alberts, HL: Univ Johannesburg, Dept Phys, POB 524,Auckland Pk, ZA-2006 Johannesburg, South Africa. |
| 中文摘要 | The magnetic behaviour of a Cr(80-x)Fe(20)Mn(x) alloy system with x = 2, 7, 10, 13 and 22 has been investigated in the temperature range 2-400 K through measurements of magnetization, electrical resistivity, magnetoresistivity, specific heat and thermal expansion. The temperature vs. Mn concentration magnetic phase diagram of the system is rich in magnetic behaviour with ferromagnetic (FM), antiferromagnetic (AFM) and paramagnetic phase regions and a spin-glass (SG) region at the lowest temperatures. Phase transition temperatures amongst these different magnetic phases could be identified from well-defined anomalies of magnetic origin that are displayed by graphs of the above-mentioned physical properties as a function of temperature. The time relaxation of the thermo-remanent, isothermal remanent and field-cooled magnetizations below and above the SG freezing temperature show unusual aspects. These relaxations do not follow the usual superposition principle that is expected for typical SG materials. Negative giant magetoresistance (GMR) is observed in the alloys at 4 K. The GMR initially increases sharply on increasing the Mn content in the alloy system, followed by a tendency towards a saturation negative value for concentrations of more than about 10 at% Mn. Low-temperature plots of C(p)/T vs. T(2), where C(p) is the specific heat, present anomalous behaviour for alloys with x = 2, 10 and 22. For x = 2 the plot shows an upturn at the lowest temperatures that changes over to a prominent downturn for x 10 and 22. This behaviour is attributed to Fe concentration fluctuations in the alloys, confirming the theoretical model of Matthews. (C) 2008 Elsevier B.V. All rights reserved. |
| 收录类别 | SCI |
| 资助信息 | National Research Foundation of South Africa [SPF200501210005, 2053766, 2072956]; National Natural Science Foundation of China [10174070] |
| 语种 | 英语 |
| 公开日期 | 2013-09-18 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/41348]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Li, B,Alberts, HL,Strydom, AM,et al. Magnetic properties of Cr-Fe-Mn alloys[J]. JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,2009,321(2):61. |
| APA | Li, B,Alberts, HL,Strydom, AM,Wu, BM,Prinsloo, ARE,&Chen, ZJ.(2009).Magnetic properties of Cr-Fe-Mn alloys.JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS,321(2),61. |
| MLA | Li, B,et al."Magnetic properties of Cr-Fe-Mn alloys".JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS 321.2(2009):61. |
入库方式： OAI收割
来源：物理研究所
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