tailieunhanh - Epitaxial growth of high curie temperature ge1−xmnx quantum dots on si(001) by self assembly

We also evidence that the ferromagnetic ordering in Ge1−xMnx quantum dots persists up to a temperature higher 320 K. It is believed that single-crystalline quantum dots exhibiting a high Curie temperature are potential candidates for the realization of nanoscale spintronic devices. | Communications in Physics, Vol. 24, No. 1 (2014), pp. 69-77 EPITAXIAL GROWTH OF HIGH CURIE-TEMPERATURE Ge1−x Mnx QUANTUM DOTS ON Si(001) BY SELF-ASSEMBLY LUONG THI KIM PHUONG Aix Marseille University, CNRS, CINaM-UMR 7325, F-13288 Marseille, France and Hong Duc University, 565 Quang Trung St., Thanh Hoa City, Vietnam NGUYEN MANH AN Hong Duc University, 565 Quang Trung St., Thanh Hoa City, Vietnam E-mail: Received 25 September 2013 Accepted for publication 22 October 2013 Abstract. We report on successful growth of epitaxial high Curie-temperature Ge1−x Mnx quantum dots on Si (001) substrates using the self-assembled approach. By decreasing the growth temperature down to 400 ˚C, we show that the Mn diffusion into the Si substrate can be neglected. No indication of secondary phases or clusters was observed. Ge1−x Mnx quantum dots were found to be epitaxial and perfectly coherent to the Si substrate. We also evidence that the ferromagnetic ordering in Ge1−x Mnx quantum dots persists up to a temperature higher 320 K. It is believed that single-crystalline quantum dots exhibiting a high Curie temperature are potential candidates for the realization of nanoscale spintronic devices. Keywords: ferromagnetic quantum dots, self-assembly, high Curie temperature, spintronics, Stranski-Krastanov growth. I. INTRODUCTION As the device miniaturization reaches technological and physical limits, adding the spin degree of freedom to the electron into conventional electronics appears as a promising solution for the development of a new generation of devices [1]. The development of such spin-based devices requires an efficient injection of spin-polarized currents from ferromagnetic materials into conventional semiconductors. Research dealing with group-IV semiconductors, such as silicon and germanium, represents a particular interest since it allows integrating spintronic devices into the existing Si technology. Germanium, thanks to its small band gap and its high mobility, is .

• Vật lý
• Communications in Physics
• High curie temperature ge1−xmnx quantum dots on si(001)
• High Curie temperature
• Stranski Krastanov growth
• Stranski Krastanov growth
• Challenges in particle physics and 3 3 1 models
• Particle physics and 3 3 1 models
• Particle theory and field theory models
• The early Universe
• Non standard model neutrino
• The 3 3 1 models in current particle physics
• Current particle physics
• The Standard Model
• The electro weak
• The process of e+e − → µ +µ
• The randall sundrum model
• Supersymmetric model and unparticle physics
• Randall Sundrum model
• Supersymmetric and Unparticle physics
• Handbook of mechanical engineering
• mechanical engineering
• mechanical design
• mechanical materials
• alloy materials
• Energy Technology
• Compact device model for nanoparticle organic memory transistor’s characterization
• Nanoparticle organic memory transistor
• Hybrid integrated circuit
• Hybrid NOMFET CMOS neuromorphic computing circuit
• Microdroplet in T junction microfluidic system
• Experiment and simulation
• T junction microfluidic system
• Lateral channel decrease
• Optical bistability in three level eit configurations
• Three level eit configurations
• Effects of atomic coherence
• OB in V type system
• Dynamical codimension 2 brane
• Warped six dimensional space time
• Codimension 2 brane
• Warped 6D bulk space time
• Coherent diffractive imaging using table top high harmonic generation
• Coherent diffractive imaging
• Table top high harmonic generation
• Growth of single crystals of methylammonium lead mixedhalide perovskites
• Growth of single crystals
• Methylammonium lead mixedhalide perovskites
• Organo lead mixed halide perovskites
• Tuning electronic transport properties
• Zigzag graphene nanoribbons
• Stone wales defect
• Negative differential resistance
• Asymmetric and symmetric ZGNRs
• The transmembrane italian mutant
• The temperature replica exchange molecular dynamics
• TmE22K trimer structure
• Kinetics probably yield
• Electrochemical fabrication of hybrid plasmonic dielectric nanomaterials
• Gold diamond clusters
• Hybrid plasmonic dielectric nanomaterials
• hybrid plasmonic dielectric materials
• Electron microscopy and optical characterization
• X ray absorption fine structure
• BCC crystals studied
• High order expanded debye waller factors
• Debye Waller factors
• Temperature dependent cumulants
• Nonlinear optics in waveguide arrays and photonic nanowires
• Nonlinear optics in waveguide arrays
• Diffractive resonant radiation
• The spectral body of the pulse
• Radion production in high energy photon collisions
• Solve the hierarchy problem
• Energy loss function for lead
• Local field effect
• Adiabatic local density approximation
• First principles calculations shows good agreemen
• Perturbative nonlinear optics in the extreme ultraviolet region
• The extreme ultraviolet region
• Different extreme ultraviole
• Multiple cycle pulses
• Thermodynamic hadron quark phase transition
• Chiral nuclear matter to quark gluon plasma
• Quark gluon plasma
• Equilibrium properties near critical points
• Phase transitions and critical phenomena
• Chirality of light in hybrid modes
• Vacuum clad ultrathin optical fibers
• Ultrathin optical fibers
• Superchiral outside the fiber
• An advanced logarithmic phase mask for extending depth
• Field of hybrid optical systems
• Modulation transfer functions
• Hybrid imaging system
• Hyperon W production in pp collisions at energy 8 tev
• Investigate the hadronization process
• The RICH detector
• The nominal value
• Profile of the 12co(3 2) emission line detected
• The debris disc of 49 ceti
• Require relatively violent
• Generate secondary gas
• Synthesis and optical characterization
• Building block plasmonic gold nanostructures
• Random nano islands
• Random Au nano islands
• Electrochemical performance of Na0
• 44Mno2 synthesized
• Hydrothermal method using as a cathode material
• Sodium ion batteries
• Sodium ion battery
• Stable during cycling