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Search Publications by: Daniel T Pierce (Assoc)

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Displaying 76 - 100 of 156

Use of Thorium as a Target in Electron Spin Analyzers

April 1, 1989
Author(s)
Jabez J. McClelland, M Scheinfein, Daniel T. Pierce
Measurements of the effective Sherman function have been carried out for 10-100-keV spin-polarized electrons scattering from a thick thorium target in a retarding Mott analyzer. At 20 and 100 keV the dependence on the maximum energy loss accepted by the

Characterization of Epitaxial Fe on GaAs(110) By Scanning Tunneling Microscopy

January 1, 1989
Author(s)
Robert A. Dragoset, P First, Joseph A. Stroscio, Daniel T. Pierce, Robert Celotta
Iron on GaAs(110) comprises an interesting system not only due to small lattice mismatch, 1.4%, but also because of the magnetic properties of the overlayer. In the present work, scanning tunneling microscopy (STM) was used to investigate bcc Fe films in

Improved Low-Energy Diffuse Scattering Electron-Spin Polarization Analyzer

January 1, 1989
Author(s)
M Scheinfein, Daniel T. Pierce, John Unguris, Jabez J. McClelland, Robert Celotta, Michael H. Kelley
An improved low-energy diffuse scattering electron-spin polarization analyzer is described. It is based on the low-energy (150 eV) diffuse scattering of polarized electrons from polycrystalline evaporated Au targets. By collecting large solid angles and

Influence of the Surface on Magnetic Domain Wall Microstructure

January 1, 1989
Author(s)
M Scheinfein, John Unguris, Robert Celotta, Daniel T. Pierce
The magnetization orientations in domain walls at the surfaces of an Fe crystal, a ferromagnetic glass, and a Permalloy film, measured by scanning electron microscopy with polarization analysis, exhibit asymmetric surface Neacute}el wall profiles which (1)

Magnetic Microstructure of the (0001) Surface of the HCP Cobalt

January 1, 1989
Author(s)
John Unguris, M Scheinfein, Robert Celotta, Daniel T. Pierce
The magnetic domain structure of the (0001) surface of a hcp cobalt crystal was investigated using scanning electron microscopy with polarization analysis (SEMPA). This is the first observation by SEMPA of both out-of-plane and in-plane magnetization

Metallicity and Gap States in Tunneling to Fe Clusters on GaAs(110)

January 1, 1989
Author(s)
P First, Joseph A. Stroscio, Robert A. Dragoset, Daniel T. Pierce, Robert Celotta
We report the characteristics of tunneling to a GaAs(110) substrate with distinct, nanometer-size Fe clusters, as a function of distance from and size of the clusters. We show that Fe clusters of volumes 150 Aring} 3, corresponding to =13 atoms, are

Domain Images of Ultrathin Fe Films on Ag(100)

May 30, 1988
Author(s)
J L. Robins, Robert Celotta, John Unguris, Daniel T. Pierce, B Jonker, G Prinz
Scanning electron microscopy with electron polarization analysis has been used to image domains of ultrathin Fe films grown epitaxially on a Ag(100) substrate. Room-temperature measurements show clearly the existence of large domains of in-plane

Electron Spin Polarization Analyzers for Use with Synchrotron Radiation

April 1, 1988
Author(s)
Daniel T. Pierce, Robert Celotta, Michael H. Kelley, John Unguris
The measurement of the spin polarization of photoelectrons emitted from a magnetic material is discussed. An important consideration is the acceptance phase space of the spin analyzer relative to the phase space of the photoemitted electrons to be measured

Spin-Polarized Electron Microscopy

January 1, 1988
Author(s)
Daniel T. Pierce
A current scientific challenge with many ramifications for magnetic technology is to image magnetic microstructure with the highest possible spatial resolution in order to observe magnetic domains or even spin configurations within a domain wall

Scanning Electron Microscopy with Polarized Electrons

April 15, 1987
Author(s)
John Unguris, G Hembree, Robert Celotta, Daniel T. Pierce
The recent joining of scanning electron microscopy and electron spin polarization analysis has greatly improved the ability to study magnetic microstructure. By measuring the spin polarization of secondary electrons, scanning electron microscopy with

Experimental Studies of Surface Magnetism with Polarized Electrons

January 1, 1987
Author(s)
Daniel T. Pierce
The same electron spectroscopies that are so powerful for studying surfaces generally, can be made sensitive to magnetic properties when electron spin polarization is included as a parameter, for example by probing with a spin polarized electron beam or