Enhanced electron correlations, local moments, and Curie temperature in strained MnAs nanocrystals embedded in GaAs
نویسندگان
چکیده
M. Moreno,1,* J. I. Cerdá,1 K. H. Ploog,2 and K. Horn3 1Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, E-28049 Madrid, Spain 2Paul-Drude-Institut für Festkörperelektronik, Hausvogteiplatz 5-7, D-10117 Berlin, Germany 3Fritz-Haber-Institut der Max-Planck-Gesellshaft, Faradayweg 4-6, D-14195 Berlin, Germany Received 6 October 2009; revised manuscript received 5 January 2010; published 20 July 2010
منابع مشابه
MnAs Nanocrystals Embedded in GaAs
In the last years a lot of effort has been devoted to a search for hybrid ferromagnet–semiconductor structures in aim of novel information storage and spin electronics applications. Nanocomposites with ferromagnetic above room temperature MnAs nanoclusters, embedded in GaAs matrix (MnAs/GaAs), are promising candidates for this type of material (e.g. [1–3]). Recently, it has been reported that t...
متن کاملHeisenberg Hamiltonian description of multiple-sublattice itinerant-electron systems: General considerations and applications to NiMnSb and MnAs
We consider magnetic systems where the magnetic sublattices can be unambiguously separated into sublattices of inducing and induced moments. The concrete numerical calculations are performed for half-metallic ferromagnetic Heusler compound NiMnSb and hexagonal phase of MnAs. In both systems, Mn atoms possess a robust atomic moment that is much larger than the induced moments of other atoms. It ...
متن کاملThermally induced magnetization switching in Fe/MnAs/GaAs(001): selectable magnetic configurations by temperature and field control
Spintronic devices currently rely on magnetization control by external magnetic fields or spin-polarized currents. Developing temperature-driven magnetization control has potential for achieving enhanced device functionalities. Recently, there has been much interest in thermally induced magnetisation switching (TIMS), where the temperature control of intrinsic material properties drives a deter...
متن کاملMicromagnetic investigation of MnAs thin films on GaAs surfaces
This work presents the study of the micromagnetic domain structure and the coupled magneto-structural phase transition of MnAs thin films on GaAs. In particular, the influence of substrate orientation, film thickness and external magnetic field on the magnetic and structural properties are investigated, employing the complementary measurement techniques atomic force microscopy-AFM / magnetic fo...
متن کاملEnhanced Exciton–Phonon Coupling in Spherical GaAs Nanocrystals Studied by Selective Excitation Spectroscopy
Phonon-assisted exciton transitions in spherical GaAs nanocrystals embedded in SiO2 matrices have been studied by means of selective excitation spectroscopy. The optical and acoustic phononassisted optical transitions appear in the photoluminescence excitation, photoluminescence linenarrowing, and photoluminescence hole-burning spectra at low temperatures. Both direct (zerophonon) and phonon-as...
متن کامل