Regensburg 2013 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 12: Poster 1

DF 12.72: Poster

Dienstag, 12. März 2013, 10:30–13:30, Poster D

Magnetic phases and anisotropy in ion irradiated SiC — •Yutian Wang¹, Lin Li¹, Slawomir Prucnal¹, Zhaorong Yang², Kay Potzger¹, and Shengqiang Zhou¹ — ¹Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, P.O. Box 510119, 01314 Dresden, Germany — ²Key Laboratory of Materials Physics Institute of Solid State Physics, Chinese Academy of Sciences, Hefei 230031, People's Republic of China

SiC, as an important electronic and optoelectronic material, has been found to be ferromagnetic after ion or neutron bombardment. So far the original ferromagnetism is still unknown; however the fact that the intrinsic or artificial defects are closely related to the ferromagnetism is a consensus. We prepare ferromagnetic SiC by Ne ions irradiation. Our results show that the saturation magnetization has increased initially by increasing the irradiation fluence, then dropped to almost zero since a large irradiation fluence induced too much disorder[1]. We observe two coexisting magnetic phases. One is superparamagnetic with a blocking temperature around 50 K, while another one has a Curie temperature well above room temperature. The sample also exhibits magnetic anisotropy with the in-plane as the easy axis. Chemical or physical etchings were preformed to correlate the magnetization to the implantation depth. At last, the FDMNES fitting results of carbon K-edge of SiC XAS (X-ray absorption spectroscopy) also present in this contribution.

Refence: 1.Li, L., et al., Appl. Phys. Lett., 98, 222508 (2011).