Correlation between microstructure and first-order magnetization reversal in the SmCo5/α-Fe nanocomposite magnets |
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| Authors: | Chuan-bing Rong Ying ZhangMJ Kramer J Ping Liu |
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| Institution: | a Department of Physics, University of Texas at Arlington, Arlington, TX 76019, USA
b Division of Materials Science and Engineering, Ames Laboratory, USDOE, Iowa State University, Ames, IA 50011, USA |
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| Abstract: | SmCo5/α-Fe nanocomposite magnets with different morphology have been fabricated by ball milling of the micrometer sized SmCo5 and α-Fe powders. The α-Fe grains vary from elongated nano-strips to spherical nanoparticles with increasing milling time. The inter-phase exchange coupling is enhanced with increasing milling time due to reduced grain size. The first-order reversal curves (FORCs) are taken to identify optimal conditions for exchange coupling. It has been found that the stripped morphology results in weak inter-phase exchange coupling, while enhanced exchange coupling is observed with further reduction of the soft-phase grain size. Compared with the measurement of demagnetization curves, FORC analysis provides more information on the magnetostatic as well as the exchange interactions. |
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| Keywords: | First-order reversal curve Nanocomposite magnets Magnetostatic and intergranular exchange interactions |
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