Abstract
The magneto-transport properties of granular paramagnetic–ferromagnetic GaAs:Mn/MnAs hybrids have been studied. Positive and negative magnetoresistivity can be observed in the paramagnetic matrix as well as in the GaAs:Mn/MnAs hybrid system. The experimental results and the respective relevant interactions are discussed. A phenomenological explanation from a microscopic point of view is presented. It is suggested that the paramagnetism of the matrix plays a major role in the magneto-resistive behavior of the hybrids, in contrast to diamagnetic–ferromagnetic hybrids where the magnetoresistance (MR) is dominated by the ferromagnetism of the clusters.
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T. Dietl, H. Ohno, F. Matsuleavoa, J. Cibert, and D. Ferrand, Science 287, 1019 (2000).
H. Akinaga, J. De Boeck, G. Borghs, S. Miyanshi, A. Asamitsu, W. Van Roy, Y. Tomioka, and L. H. Kuo, Appl. Phys. Lett. 72, 3368 (1998).
M. Moreno, A. Trampert, B. Jenichen, L. Däweritz, and K. H. Ploog, J. Appl. Phys. 92, 4672 (2002).
J. De Boeck, R. Oesterholt, A. Van Esch, H. Bender, C. Bruynseraede, C. Van Hoof, and G. Borghs, Appl. Phys. Lett. 68, 2744 (1996) .
M. Lampalzer, K. Volz, W. Treutmann, S. Nau, T. Torunski, K. Megges, J. Lorberth, and W. Stolz, J. Cryst. Growth 248, 474 (2003).
H. Falk, P. J. Klar, and W. Heimbrodt, Thin Solid Films 380, 215 (2000).
P. J. Klar, H. Falk, and W. Heimbrodt, Solid State Commun. 116, 125 (2000).
S. A. Crooker, D. G. Rickel, S. K. Lyo, N. Samarth, and D. D. Awschalom, Phys. Rev. B 60, R2173 (1999).
H. Overhof, and P. Thomas, Springer Tracts in Modern Physics, Vol. 114 (Springer, Berlin, 1989).
C. Michel, P. J. Klar, S. D. Baranovskii, and P. Thomas, Phys. Rev. B 69, 165211 (2004).
M. Baibich, J. Broto, A. Fert, F. Nguyen van Dau, F. Petroff, P. Etienne, G. Creuzet, A. Friederich, and J. Chazelas, Phys. Rev. Lett. 61, 2472 (1988).
S. Zhang and P. M. Levy, J. Appl. Phys. 73, 5315 (1993).
J. Q. Wang and G. Xiao, Phys. Rev. B 49, 3982 (1994).
F. Badia, X. Battle, A. Labarta, M. L. Watson, A. B. Johnston, and J. N. Chapman, J. Appl. Phys. 92, 677 (1997).
N. F. Mott, Proc. R. Soc. Lond. Ser. A 153, 699 (1936).
S. A. Solin, T. Thio, D. R. Hines, and J. J. Heremans, Science 289, 1530 (2000).
J. Moussa, L. R. Ram-Mohan, J. Sullivan, T. Zhou, D. R. Hines, and S. A. Solin, Phys. Rev. B 64, 184410 (2000).
T. Thio and S. A. Solin, Appl. Phys. Lett. 72, 3497 (1998).
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Heimbrodt, W., Klar, P.J., Ye, S. et al. Magnetic Interactions in Granular Paramagnetic–Ferromagnetic GaAs: Mn/MnAs Hybrids. J Supercond 18, 315–320 (2005). https://doi.org/10.1007/s10948-005-0001-6
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DOI: https://doi.org/10.1007/s10948-005-0001-6