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Search Publications by: Joseph A Stroscio (Fed)

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Displaying 51 - 75 of 88

Trapping and Moving Atoms on Surfaces

December 1, 2005
Author(s)
Robert Celotta, Joseph A. Stroscio
We have used a scanning tunneling microscope to laterally reposition a single cobalt atom adsorbed on the (111) face of a copper crystal. We find that the atom follows a complex path determined by the trapping potential of the STM tip, the effects of

Controlling the Dynamics of a Single Atom in Lateral Atom Manipulation

October 8, 2004
Author(s)
Joseph A. Stroscio, Robert Celotta
We study the dynamics of a single Co atom during lateral manipulation on a Cu(111) surface in a low temperature scanning tunneling microscope. The Co binding site locations are revealed in a detailed image that results from lateral Co atom motion within

Real-Space Imaging of Structural Transitions in the Vortex Lattice of V 3 Si

October 6, 2003
Author(s)
C Sosolik, Joseph A. Stroscio, Mark D. Stiles, E Hudson, Steven R. Blankenship, Aaron P. Fein, Robert Celotta
The predictions of nonlocal London theory are confirmed by real-space measurements of the hexagonal to nearly square transition in the vortex lattice structure of V 3Si. We observe that the lattice transforms from hexagonal to nearly square over the field

A Facility for Nanoscience Research: An Overview

July 1, 2002
Author(s)
Joseph A. Stroscio, E Hudson, Steven R. Blankenship, Robert Celotta, Aaron P. Fein
We describe the development of an experimental system, consisting of a low temperature scanning tunneling microscope coupled to UHV tip and sample preparation chambers, with the goal of providing new measurement capabilities for the study of quantum and

Non-collinear Exchange Coupling in Fe/Mn/Fe(001): Insight from Scanning Tunneling Microscopy

December 1, 2000
Author(s)
Daniel T. Pierce, Angela Davies, Joseph A. Stroscio, D Tulchinsky, John Unguris, Robert Celotta
The film growth and morphology of epitaxial Mn films grown on Fe(001) single crystal whiskers measured with scanning tunneling microscopy (STM) provides insight into the mechanism of interlayer exchange coupling in Fe/Mn/Fe(001) trilayers. The proximity

A Low Temperature STM Facility for the Study of Quantum and Spin Electronic Systems

November 15, 2000
Author(s)
Joseph A. Stroscio, Robert Celotta, Steven R. Blankenship, E Hudson, Aaron P. Fein
We describe an experimental system with the goal of providing new measurement capabilities for the study of quantum and spin electronic systems on the nanometer scale. The physical information desired in such systems includes: the quantized electron energy

Polarized Light Emission from the Metal-Metal STM Junction

January 1, 1998
Author(s)
Daniel T. Pierce, Angela Davies, Joseph A. Stroscio, Robert Celotta
The polarization of light emitted during inelastic tunneling of electrons into both Au(111) and Fe(001) using W(111) tips in an STM junction has been fully characterized by measuring the Stokes parameters. The emitted light for both Au(111) and Fe(001) is

Observations of Alloying in the Growth of Cr on Fe(001)

January 1, 1997
Author(s)
Angela Davies, Joseph A. Stroscio, Daniel T. Pierce, John Unguris, Robert Celotta
Using scanning tunneling microscopy, we observe the alloying of Cr with an Fe(001) substrate for various coverages at two temperatures. At low Cr coverage, the alloy consists of individual Cr impurities surrounded by Fe. Elemental identification is

A Closed Loop Controller for Electron-beam Evaporators

January 1, 1996
Author(s)
Alan H. Band, Joseph A. Stroscio
A simple instrument for automatically controlling the deposition rate of an electronbeam evaporator is described. The design incorporates a commercially available, microprocessor based, Proportional-Integral-Differential (PID) process controller which

Atomic-scale Observations of Alloying at the Cr-Fe(001) Interface

January 1, 1996
Author(s)
Angela Davies, Joseph A. Stroscio, Daniel T. Pierce, Robert Celotta
While much progress has been made using epitaxial growth of Fe/Cr/Fe structures to study magnetic exchange coupling, a number of anomalies have arisen in studies of this model system. Using scanning tunneling microscopy and spectroscopy to investigate Cr

Coarsening of Unstable Surface Features During Fe(001) Homoepitaxy

January 1, 1995
Author(s)
Joseph A. Stroscio, Daniel T. Pierce, Mark D. Stiles, A Zangwill, L Sander
The evolution of the surface profile during homoepitaxial growth of Fe(001) is studied by scanning tunnelling microscopy and reflection high energy electron diffraction. The observed morphology exhibits a non-self affine collection of mound-like features

Tunneling Spectroscopy of bcc(001) Surface States

January 1, 1995
Author(s)
Joseph A. Stroscio, Daniel T. Pierce, Angela Davies, Robert Celotta
We have discovered an intense, sharp feature in tunneling spectra of the Fe(001) and Cr(001) surfaces that derives from a bce surface state near the Fermi level. Band-structure calculations show that this state is a general feature of bcc (001) surfaces

Influence of Cr Growth on Exchange Coupling in Fe/Cr/Fe(100)

January 1, 1994
Author(s)
Daniel T. Pierce, Joseph A. Stroscio, John Unguris, Robert Celotta
Scanning electron microscopy with polarization-analysis (SEMPA) measurements of the dependence of the oscillations of the exchange coupling in Fe/Cr/Fe(100) structures on the Cr growth temperature are correlated with the thickness fluctuations in Cr films

Scaling of Diffusion-Mediated Island Growth in Iron on Iron Homoepitaxy

January 1, 1994
Author(s)
Joseph A. Stroscio, Daniel T. Pierce
An analysis of the island size and separation distributions of Fe islands, observed in the initial stages of growth in the homoepitaxy of Fe on Fe(001) whiskers, shows scaling properties recently predicted in nucleation and growth theories. A critical size

The Growth of Iron on Iron Whiskers

January 1, 1994
Author(s)
Joseph A. Stroscio, Daniel T. Pierce
Real space views of the homoepitaxial growth of Fe on Fe(001) whiskers is reported, observed by scanning tunneling microscopy (STM), during the initial stages of growth. Scaling of the Fe island sizes and separation distributions are observed as a function

Atomic Manipulation of Polarizable Atoms by Electric Field Directional Diffusion

January 1, 1992
Author(s)
Joseph A. Stroscio, L Whitman, Robert A. Dragoset, Robert Celotta
We present a brief summary of the properties of alkali metals on III-V(110) surfaces, as studied with the scanning tunneling microscope (STM). These include the non-metallic properties found in the one- and two-dimensional phases, and the directional

Microscopic Aspects of the Initial Growth of Metastable fcc Iron on the Au(111)

January 1, 1992
Author(s)
Joseph A. Stroscio, Daniel T. Pierce, Robert A. Dragoset, P First
We report on the microscopic aspects of the growth of Fe on the Au(111) surface observed with scanning tunneling microscopy. Nucleation of triangular Fe islands is observed to occur at the corners of the herringbone reconstruction of the Au(111) surface