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Displaying 76 - 100 of 120

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

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

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

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