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Spin Wave Excitation in a Mechanically Alloyed Co2MnSi Solid Solution |
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| Authors: | Dwi Nanto Dianta Ginting Dong-Seok Yang Kyeong-Sup Kim Seong-Cho Yu |
| Affiliation: | 1. BK 21 Physics Program and Dept. of Physics, Chungbuk National University, Cheongju, 361-763, South Korea 3. Physics Education, Syarif Hidayatullah State Islamic University, Jakarta, 15412, Indonesia 2. Physics Division, School of Science Education, Chungbuk National University, Cheongju, 361-763, South Korea |
| Abstract: | The spin wave excitation has been analyzed in a Co2MnSi solid solution compound. A Co2MnSi sample was prepared by utilizing a mechanical alloying technique in Ar atmosphere. After 72 hours of milling time, the Co2MnSi solid solution was transformed from a multiphase to a single broadening phase, which is essential in understanding the spin wave excitation in a nanocrystalline material. The magnetization was measured from 7 K to room temperature by using a superconducting quantum interference device (SQUID) magnetometer. The thermal-magnetization curve was found to obey the Bloch law, M S(T)=M S(0)(1?BT 3/2?CT 5/2). Based on this formula, the spin wave stiffness constant was calculated from the magnetization data at low temperatures. The values were 0.264 eV?Å2 and 0.325 eV?Å2 for 72 and 96 hours of milling time, respectively. The spectroscopic splitting g-factor was obtained via electron spin resonance (ESR) measurements at X-band (9.45 GHz). |
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