Structure and magnetic property of (Ga,Cr)As films with different Cr contents

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%.

Submitted by 阎军 (yanj@red.semi.ac.cn) on 2010-07-18T13:33:29Z No. of bitstreams: 0

Submitted by 阎军 (yanj@red.semi.ac.cn) on 2010-07-18T13:33:29Z No. of bitstreams: 0

The authors acknowledge Prof. T. DIETL for helpful discussions on the physics of inhomogeneous diluted magnetic semiconductors. This work was supported partly by the National Natural Science Foundation of China under Grant Nos. 60836002 and 10674130, and the special funds for the Major State Basic Research Contract No. 2007CB924903 of China, and the Knowledge Innovation Program Project of Chinese Academy of Sciences No. KJCX2.YW.W09-1.

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The authors acknowledge Prof. T. DIETL for helpful discussions on the physics of inhomogeneous diluted magnetic semiconductors. This work was supported partly by the National Natural Science Foundation of China under Grant Nos. 60836002 and 10674130, and the special funds for the Major State Basic Research Contract No. 2007CB924903 of China, and the Knowledge Innovation Program Project of Chinese Academy of Sciences No. KJCX2.YW.W09-1.