(Ga,Mn)As as a digital ferromagnetic heterostructure

Kawakami, R. K.; Johnston-Halperin, E.; Chen, L. F.; Hanson, M.; Guébels, N.; Speck, J. S.; Gossard, A. C.; Awschalom, D. D.
October 2000
Applied Physics Letters;10/9/2000, Vol. 77 Issue 15
Academic Journal
(Ga,Mn)As digital ferromagnetic heterostructures are grown by incorporating submonolayer planes of MnAs into GaAs using molecular beam epitaxy. Structural and magnetic measurements indicate single-crystalline superlattice structure and ferromagnetic order with Curie temperatures (T[sub C]) up to 50 K. By varying the spacing between neighboring Mn layers, we observe that T[sub C] initially decreases with increasing spacer thickness, followed by a regime with weak dependence on the spacer thickness. The persistence of ferromagnetism for interlayer spacings of at least 200 ML (∼560 Å) suggests that the individual Mn layers are ferromagnetic. © 2000 American Institute of Physics.


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