期刊
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 344, 期 -, 页码 211-216出版社
ELSEVIER
DOI: 10.1016/j.jmmm.2013.06.006
关键词
SmCo5-FeNi composite; High energy ball milling; Exchange coupling
资金
- NSF EAGER [0965801]
- NSF CMMI [1029780]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0965801] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1029780] Funding Source: National Science Foundation
The effect of high energy ball milling on the structure and magnetic properties of SmCo5-x%FeNi (x: 5,15), magnetically hard soft phase composites, has been investigated as a function of composition ratio, ball milling time, and annealing temperature using x-ray diffraction and room temperature magnetometry. The milling resulted in decomposition of SmCo5 and FeNi phases. Heat treatment of ball-milled composites resulted in a secondary soft magnetic phase FeCo. High remanence and coercivity values are obtained at a low annealing temperature of similar to 650 degrees C and short annealing time (20 min). Magnetic measurements of annealed composite sample, SmCo5-5%FeNi, show enhancement in magnetization (178%), remanence (127%), and coercivity (67%) as compared to that of pure SmCo5. The enhancement in coercivity and remanence is attributed to the effective exchange coupling between hard SmCo5 and soft FeCo/FeNi phases. Overall better magnetic properties were presented by composites with low FeNi content. The facile synthesis process represents a general process toward SmCo5 based exchange-spring nanocomposites for high performance bulk permanent magnet. Published by Elsevier B.V.
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