Observation of Glassy Ferromagnetism in Al-Doped 4H-SiC

摘要

Ferromagnetism (FM) at and above room temperature and spin polarization in the majority carrier band are essential requirements for practical application of diluted magnetic semiconductors (DMSs) in spintronics. However, inconsistencies in literature with respect to the issues such as reproducibility of magnetic properties or dopant segregations make most ones doubt the existence of intrinsic magnetic order and argue for the nature origin in high Curie temperature (T_c) DMSs, obtained by doping transition metal (TM) elements into a semiconductor matrix. Therefore, developing magnetic systems with nonmagnetic elements have been pushed to the frontiers of science since it precludes a spurious FM signal from metal segregation occurring.