Charge Long-range magnetic order Implemented by Coupling Xavier Marti, 1.Metals:

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Presentation transcript:

Charge Long-range magnetic order Implemented by Coupling Xavier Marti, 1.Metals: AMR,GMR 2.Semiconductors 3.Insulators Standard substrates Room temperature Grown on Boston Feb2012 Institute of Physics (Prague) – University Nottingham COBRA Inter-University Eindhoven -ORNL

Doping Temperature Xavier Marti, GaAs (Ga,Mn)AsMnAs Ferromagnetic Semiconductor

III-VFM T C (K)AFM T N (K) FeN100 FeP115 FeAs77 FeSb GdN72 GdP15 GdAs19 GdSb27 II-VIFM T C (K)AFM T N (K) MnO122 MnS152 MnSe173 MnTe323 EuO67 EuS16 EuSe5 EuTe10 Xavier Marti, Intrinsic III-V and II-VI semiconductors Maca et al., JMMM 324, 1606 (2012)

Large SOCLarge moment Large SOCLarge moment Schick et al., PRB 81, (2010) Xavier Marti,

Large SOCLarge moment Large SOCLarge moment Schick et al., PRB 81, (2010) Xavier Marti, T15 Room 213 Helena Reichlova

Large SOCLarge moment Large SOCLarge moment Schick et al., PRB 81, (2010) Xavier Marti,

Crystal and magnetic structure: Bronger et al, Z. anorg. allg. Chem. 539, 175 (1986) THEORY Semiconductor with huge spin-orbit coupling Xavier Marti,

InAs 4.27A 4.28A THIN FILM EPILAYERS V. Novak, et al., J. Cryst. Growth 323, 348 (2011)

log(intensity) InAs 4.27A 4.28A THIN FILM EPILAYERS

LiMnAs has a bandgap InAs LiMnAs 4.27A 4.28A I. Wijnheijmer et al, Appl. Phys. Lett. In press dI/dV map

Is LiMnAs the only choice available? Xavier Marti,

Xavier Marti, V. M. Ryzhkovsky, et al., Inorg. Mater (1995) A.E. Austin, et al., J. Appl. Phys (1962) TNTN RT

Xavier Marti, [110] _ CuMnAs grown on GaAs

Xavier Marti, CuMnAs grown on GaAs a b c a = b = Å c = Å GaAs, a = 5.65 Å

Xavier Marti, TEM: Jaume Gazquez, Oak Ridge NL Growth: R. Campion, Nottingham

Xavier Marti, TEM: Jaume Gazquez, Oak Ridge NL Growth: R. Campion, Nottingham GaAs CuMnAs

Xavier Marti, GaAs Fe 10 nm 300 K

GaAs CuMnAs Fe Xavier Marti, K Fe/CuMnAs exchange bias

GaAs CuMnAs Fe CuMnAs grown on GaAs Xavier Marti, K Fe/CuMnAs exchange bias

Xavier Marti, Prague : P. Wadley, H. Reichlova, M. Cukr, F. Maca, A.B. Shick, J. Masek, P. Horodyska, P. Nemec, V. Holy, J. Zemen, P. Kuzel, I. Nemec, K. Olejnik, J. Wunderlich, O. Stelmakhovych, K. Ulrihova, P. Beran, V. Novak, T. Jungwirth Nottingham : R. Campion, K. Edmonds, B. Gallagher, C.T. Foxon Eindhoven : I. Wijnheijmer, P. Koenraad ORNL: J. Gazquez, M. Varela Thanks for your attention LiMnAs CuMnAs