| Zugriffsnummer | 28644 |
| Dokumenttyp | Zeitschriftenartikel |
| Sprache | Englisch |
| Titel | Structural and magnetic properties of epitaxial Co2FeAl films grown on MgO substrates for different growth temperatures |
| Autor(in); Institution |
Chun, Byong Sun; Korea Research Institute of Standards and Science, Division of Industrial Metrology, Daejeon, REPUBLIC OF KOREA
Kim, Kyung-Ho; Korea University, Department of Materials Science and Engineering, Seoul, REPUBLIC OF KOREA
Liebing, Niklas; 2.5, Halbleiterphysik und Magnetismus, PTB-Braunschweig
Serrano-Guisan, Santiago; 2.5, Halbleiterphysik und Magnetismus, PTB-Braunschweig
Schumacher, Hans Werner; 2.5, Halbleiterphysik und Magnetismus, PTB-Braunschweig
Abid, Mohamed; Ecole Polytechnique Federale de Lausanne, IPMC-LPMN, Lausanne, SWITZERLAND
Chu, In Chang; Global EMI EMC Team, Hwaseong, REPUBLIC OF KOREA
Mryasov, Oleg N.; University of Alabama, Department of Physics and MINT, Tuscaloosa, USA
Kim, Do Kyun; Korea University, Department of Materials Science and Engineering, Seoul, REPUBLIC OF KOREA
Wu, Han-Chun; Trinity College Dublin, CRANN, School of Physics, Dublin, IRELAND
Hwang, Chanyong; Korea Research Institute of Standards and Science, Division of Industrial Metrology, Daejeon, REPUBLIC OF KOREA
Kim, Young Keun; Korea University, Department of Materials Science and Engineering, Seoul, REPUBLIC OF KOREA
|
| Quelle/Jahr | Acta Materialia: 60 (2012), 19, 6714 - 6719 |
| ISSN | 1359-6454 (PRINT AND ONLINE) |
| DOI | |
| Verlag | Amsterdam: Elsevier Ltd. |
| Freie Schlagworte | Heusler alloys ; Co2FeAl ; Magnetic properties ; Epitaxial growth |
| Zusammenfassung | We report the correlation between the crystalline structure, electronic structure and magnetic properties of Co2FeAl films as a function of growing temperature both experimentally and theoretically. The Co2FeAl film grown at room temperature is initially in the partially disordered B2 state, but then it gains a much higher ordered structure with increasing growing temperature due to its transition from short-range to long-range crystallographic order by surface diffusion. Electron energy loss spectroscopy measurements reveals that the increase in the I(L3)/I(L2) ratio of Co can be attributed to the enhanced ferromagnetic exchange interaction between neighboring Co atoms and the fact that the Co contribution is more dominant than the Fe contribution. As the growing temperature increases, many more unoccupied 3d states in Co are observed, hence the Gilbert damping constant increases due to a strong spin–orbit interaction. We also present the results of highly accurate quasiparticle self-consistent GW calculations and confirm that Co2FeAl in an ideal L21 structure is indeed a half-metal with a well-defined band gap in the minority spin channel. |
Zitierung
Chun, B. S., Kim, K.-H., Liebing, N., Serrano-Guisan, S., Schumacher, H. W., Abid, M., Chu, I. C., Mryasov, O. N., Kim, D. K., Wu, H.-C., Hwang, C., & Kim, Y. K. (2012). Structural and magnetic properties of epitaxial Co₂FeAl films grown on MgO substrates for different growth temperatures. Acta Materialia, 60(19), 6714–6719. https://doi.org/10.1016/j.actamat.2012.08.041