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Search Publications by: Daniel T Pierce (Assoc)

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Displaying 126 - 150 of 156

Spin and Energy Analyzed Secondary Electron Emission from a Ferromagnet

July 5, 1982
Author(s)
John Unguris, Daniel T. Pierce, A Galejs, Robert Celotta
Measurements are presented of the energy dependence of the spin polarization of low-energy (0.5-25 eV) secondary electrons when a 500-eV primary beam is incident on an iron-based ferromagnetic glass. The polarization of the lowest-energy electrons is found

Polarized Electrons

January 1, 1982
Author(s)
Robert Celotta, Daniel T. Pierce, Michael H. Kelley, W Rogers
The electron-sodium system is an excellent prototype of non-relativistic electron scattering from a quasi-one-electron atomic target, and is tractable both experimentally and theoretically. Recently, this system has been studied in a series of

Absorbed Current Electron Spin Polarization Detector

October 1, 1981
Author(s)
Daniel T. Pierce, S Girvin, John Unguris, Robert Celotta
The principle of spin analysis by means of measurement of the spin dependent absorption of a polarized electron beam is presented. The spin dependent signal is enhanced relative to the spin averaged signal at an energy near which the secondary yield is

Polarized Low Energy Electron Diffraction (PLEED) from W(100)

February 15, 1981
Author(s)
G Wang, Robert Celotta, Daniel T. Pierce
A set of polarized low-energy-electon diffraction (PLEED) data from a W(100) surface measured using a polairzed electron beam is presented. The data include conventional LEED profilesI(E,θ) as well as S(Eθ profiles which measure the spin dependence of the

Spin Dependent Absorption of Electrons in a Ferromagnetic Metal

February 9, 1981
Author(s)
H Siegmann, Daniel T. Pierce, Robert Celotta
It is found that the current collected by a ferromagnet placed in an electron beam depends on the orientation of the incident electron spin. At certain energies, only electrons with spins parallel or antiparallel to the net surface spin density cause a net

Spin Dependence of Electronic Surface Resonance Scattering from W(100)

January 1, 1981
Author(s)
Daniel T. Pierce, Robert Celotta, G Wang, E McRae
In polarized low energy electron diffraction (PLEED) from W(100) at energies of 2 to 9 eV and incident angles 15 degrees < θ < 45 degrees, we observe a spin-splitting of the resonance sequence of peaks which converge on the (01) beam threshold. For θ > 26

GaAs Spin Polarized Electron Source

April 1, 1980
Author(s)
Daniel T. Pierce, Robert Celotta, G Wang, W Unertl, A Galejs, C Kuyatt, S Mielczarek
The design, construction, operation, and performance of a spin polarized electron source utilizing photoemission from negative electron affinity (NEA) GaAs are presented in detail. A polarization of 43plus or minus}2% is produced using NEA GaAs (100). The

A Polarized LEED Study of Surface Magnetism

January 1, 1980
Author(s)
Daniel T. Pierce, Robert Celotta, G Wang, G P. Felcher, S Bader, K Miyano
The surface magnetization of ferromagnetic Ni(110) has been observed via the use of a spin polarized electron beam. The spin dependence of the scattered electron intensity was measured as a function of external magnetic field strength and temperature.

Spin and Energy Analyzed Photoemission: A Feasibility Analysis

November 1, 1979
Author(s)
Daniel T. Pierce, C Kuyatt, Robert Celotta
New scientific opportunities, particularly for investigation of surface magnetism, will be provided by spin and energy analyzed photoemission. Electron-optical conservation laws and phase space concepts are summarized and applied to determine the