U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

Search Publications by: Daniel T Pierce (Assoc)

Search Title, Abstract, Conference, Citation, Keyword or Author
Displaying 51 - 75 of 156

Simple, Compact, High-Purity Cr Evaporator for UHV

September 1, 1993
Author(s)
Jabez J. McClelland, John Unguris, R E. Scholten, Daniel T. Pierce
A simple, compact Cr evaporator is constructed by electroplating Cr metal onto the tip of a W hairpin filament. At 5 cm from the evaporator, deposition rates up to 10 nm min -1 (flux {asymp} 10 19 atoms m -2s -1) have been obtained, with total deposition

Magnetic Moments in Cr Thin Films on Fe(100)

January 1, 1993
Author(s)
Daniel T. Pierce, Robert Celotta, John Unguris
The magnetism at the surface of a Cr film grown epitaxially on a Fe(100) whisker is observed as a function of Cr thickness by scanning electron microscopy with polarization analysis. Use of a wedge-shaped film of linearly increasing thickness allows the

Magnetism in Cr Thin Films on Fe(100)

January 1, 1992
Author(s)
John Unguris, Robert Celotta, Daniel T. Pierce
The spin polarization of secondary electrons from a Cr film on Fe(100), measured with scanning electron microscopy with polarization analysis, oscillates as a function of Cr thickness with a period near two atomic layers, consistent with incommensurate

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

Spin-Polarized Photoemission Spectroscopy of Magnetic Surfaces Using Undulator Radiation

January 1, 1992
Author(s)
Philip Johnson, S Hulbert, R Klaffky, N Brookes, Andrew Clarke, B Sinkovic, N. Smith, Robert Celotta, Michael H. Kelley, Daniel T. Pierce, M Scheinfein, B Waclawski, B.O. Wells
A beamline has been established at the National Synchrotron Light Source to perform angle-resolved photoemission experiments on magnetic surfaces with spin sensitivity. The system has two novel features: it uses a miniature electron-spin polarization

A System for the Study of Magnetic Materials and Magnetic Imaging with the STM

January 1, 1991
Author(s)
P First, Joseph A. Stroscio, Daniel T. Pierce, Robert A. Dragoset, Robert Celotta
A report of work in progress to determine the feasibility of imaging the magnetization of ferromagnetic samples with the scanning tunneling microscope (STM) is presented. A vacuum system was designed to test several different proposals as well as to

Micromagnetics of Domain Walls At Surfaces

January 1, 1991
Author(s)
M Scheinfein, John Unguris, J L. Blue, Kevin Coakley, Daniel T. Pierce, Robert Celotta, P J. Ryan
High-spatial-resolution magnetization maps of ferromagnetic surfaces are generated with use of scanning electron microscopy with polarization analysis (SEMPA). The structure of surface Neel walls is measured by SEMPA and compared directly to the results of

Scanning Electron Microscopy with Polarization Analysis (SEMPA) Studies of Domains, Domain Walls and Magnetic Singularities at Surfaces and in Thin Films

January 1, 1991
Author(s)
M Scheinfein, John Unguris, M Aeschlimann, Daniel T. Pierce, Robert Celotta
Scanning Electron Microscopy with Polarization Analysis (SEMPA) is used to investigate the surface magnetic microstructure of domain walls in thin permalloy films and the domain structure of magneto-optic TbFeCo alloys. Domain wall measurements confirm the

180deg Surface Domain Wall Magnetization Profiles: Comparisons Between Scanning Electron Microscopy with Polarization Analysis Measurements, Magneto-Optic Kerr Microscopy Measurements and Micromagnetic Models

January 1, 1990
Author(s)
M Scheinfein, P J. Ryan, John Unguris, Daniel T. Pierce, Robert Celotta
We compare measurements of magnetization profiles across a 180° surface domain wall in a 0.24-υm-thick of Permalloy (Ni 81Fe 19), obtained with scanning electron microscopy with polarization analysis (SEMPA) and longitudinal magneto-optic (MO) Magneto

Dispersion of Evanescent Band Gap States in Fe Clusters on GaAs(110)

January 1, 1990
Author(s)
Joseph A. Stroscio, P First, Robert A. Dragoset, L Whitman, Daniel T. Pierce, Robert Celotta
We report scanning tunneling microscopy results on the band gap states observed in tunneling to nanometer size metallic Fe clusters on GaAs(110) surfaces. In the vicinity of the Fe clusters, a continuum of gap states is found in tunneling spectra from

High Spatial Resolution Quantitative Micromagnetics

January 1, 1990
Author(s)
M Scheinfein, John Unguris, Daniel T. Pierce, Robert Celotta
Magnetization profiles at surfaces are observed with scanning electron microscopy with polarization analysis (SEMPA). This technique allows for quantitative analysis of the vector magnetization profile with 70 nm spatial resolution. Magnetization profiles

Scanning Electron Microscopy With Polarization Analysis (SEMPA)

January 1, 1990
Author(s)
M Scheinfein, John Unguris, Michael H. Kelley, Daniel T. Pierce, Robert Celotta
This was an extended abstract prepared for inclusion in the Microscopy & Microanalysis '99 Proceedings. It is a summary of Observation of Antiparallel Magnetic Order in Weakly Coupled Co/Cu Multilayers, which was published in Physical Review Letters, Vol

Surface Magnetic Microstructure

January 1, 1990
Author(s)
M Scheinfein, John Unguris, Robert Celotta, Daniel T. Pierce
The way in which a magnetic solid minimizes its energy through the formation of domains and domain walls is strongly influenced by the presence of the surface. At the surface, a bulk Blich wall may change into a Neel wall in order to reduce the magnetic

Surface, Interface and Thin-Film Magnetism

January 1, 1990
Author(s)
L Falicov, Daniel T. Pierce, S Bader, R Gronsky, K Hathaway, H Hopster, D Lambeth, S Parkin, G Prinz, M Salamon, Ivan K. Schuller, R Victora
A comprehensive review and state of the art in the field of surface, interface, and thin-film magnetism is presented. New growth techniques which produce atomically engineered novel material, special characterization techniques to measure meagnetic