Structure and magnetic property of (Ga,Cr)As films with different Cr contents
State Key Laboratory for Superlattices and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences - P.O. Box 912, Beijing 100083, China
2 National Synchrotron Radiation Laboratory, University of Science and Technology of China - Hefei 230029, China
Corresponding author: email@example.com
Accepted: 9 March 2010
We report variations in structure and magnetic property of (Ga,Cr)As films with increasing Cr content x. Due to phase segregation, a tendency towards inhomogeneous distribution with increasing x is confirmed. Barkhausen-like magnetization and large remanent magnetic moment were also clearly observed in the samples with x < 5.3%. However, spin-glass–like behaviors were observed in both dc and ac magnetic measurements, which might originate from the competition between magnetic nucleation and frustration of long ferromagnetic order in this inhomogeneous system. All the samples exhibit characteristics of variable-range hopping conductivity at temperature below 150 K. Typical magnetic circular dichroism structure was observed in the sample with x = 7.9%.
PACS: 75.50.Pp – Magnetic semiconductors / 75.10.Nr – Spin-glass and other random models / 61.05.cj – X-ray absorption spectroscopy: EXAFS, NEXAFS, XANES, etc.
© EPLA, 2010