The reference details

R. K. Kawakami, E. Johnston-Halperin, L. F. Chen, M. Hanson, N. Guébels, J. S. Speck, A. C. Gossard, and D. D. Awschalom, "(Ga,Mn)As as a digital ferromagnetic heterostructure", Appl. Phys. Lett. 77, 2379 (2000): on-line

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