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Electron microscopy study of L1 |
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| Authors: | Y HIROTSU HW RYU† K SATO‡ & M ISHIMARU |
| Affiliation: | The Institute of Scientific and Industrial Research, Osaka University, 8–1 Mihogaoka, Ibaraki, Osaka 567–0047, Japan;Department of Materials Science and Engineering, Graduate School of Engineering, Osaka University, 2–1 Yamadaoka, Suita, Osaka 565–0871, Japan;Institute for Materials Research, Tohoku University, Sendai 980–8577, Japan |
| Abstract: | Finely dispersed hard magnetic L1o-FePtCu nanoparticles with 〈100〉 orientation were directly synthesized by RF-sputtering on NaCl substrate at a temperature of 613 K. The maximum coercivity of the particles was 1.4 kOe (at RT). Degrees of atomic long-range order (LRO) for the L1o-FePtCu nanoparticles with different sizes were obtained using nanobeam electron diffraction technique. The decrease of LRO parameter became remarkable when the size became below 8 nm. The coercivity value also decreased with decreasing the particle size. The relation between the LRO parameter decrease and the coercivity decrease with particle size was discussed. |
| Keywords: | Coercivity electron microscopy electron diffraction magnetic nanoparticles order parameter |