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Exchange coupled magnetic nanocomposites of Sm(Co1−xFex)5 / Fe3O4 with core/shell structure |
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| Authors: | Jung Hoon Hong Jong In Lee |
| Institution: | a Research Department, Implant R & D Center, Osstem Implant Co., Busan 611-801, Republic of Korea b Division of Physical Metrology, Korea Research Institute of Standards and Science, Yuseong, P.O. Box 102, Daejeon 305-600, Republic of Korea c Department of Chemistry, Sogang University, Seoul 121-742, Republic of Korea |
| Abstract: | Magnetic nanocomposites of Sm(Co1−xFex)5/Fe3O4 (x≈0.1) with the core/shell type structure were successfully fabricated using a two-step polyol process, where as-prepared SmCo5(1−x) nanoparticles were used as seeds for the ferrite coating. The core/shell composites are quite stable in air and show a typical hysteric behavior of single component, yielding an enhanced coercivity of 2.2 kOe with a saturated magnetization of 130 emu/g at 5 T. The magnetization data clearly reveal the presence of effective exchange coupling between the hard-magnetic Sm(Co1−xFex)5 core and soft-magnetic Fe3O4 shell, suggestive of a single-phase structure rather than a distinctive two-phase one. |
| Keywords: | 81 07 -b 75 75 +q 71 70 Gm |
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