In situ observation of magnetic domain pattern evolution in applied fields by spin-polarized low energy electron microscopy

2002 ◽  
Vol 91 (10) ◽  
pp. 6932 ◽  
Author(s):  
H. Poppa ◽  
E. D. Tober ◽  
A. K. Schmid
Keyword(s):  
Electron Microscopy ◽  
Magnetic Domain ◽  
Low Energy ◽  
Energy Electron ◽  
In Situ Observation ◽  
Domain Pattern ◽  
Spin Polarized ◽  
Low Energy Electron ◽  
Applied Fields

Spin Polarized Low Energy Electron Microscopy (Spleem) of Single and Combined Layers of Co, Cu, and Pd on W (110)

1993 ◽  
Vol 313 ◽  
Author(s):  
Helmut Poppa ◽  
Heiko Pinkvos ◽  
Karsten Wurm ◽  
Ernst Bauer
Keyword(s):  
Electron Microscopy ◽  
Band Structure ◽  
Film Growth ◽  
Magnetic Domain ◽  
Low Energy ◽  
Energy Electron ◽  
Magnetic Studies ◽  
Deposition Rates ◽  
Spin Polarized ◽  
Low Energy Electron

ABSTRACTIn-situ recording of ultra-thin film growth by Low Energy Electron Microscopy (LEEM) results in accurate determinations of monolayer metal deposition rates for difficult to calibrate deposition geometries. Deposition rates and growth features were determined for Cu and Co on W (110) allowing for thickness control at the submonolayer level. Also, the transparencies of non-Magnetic overlayers of Pd (111) and Cu (111) to very low energy spin polarized electrons were compared and qualitatively explained by band structure considerations. Cu (111) is much more transparent than Pd (111) so that magnetic domain structures can be observed through at least 4 nmof Cu (111). This suggests the use of Cu (111) and other metals of suitable band structure as protective layers for surface magnetic studies.

scholarly journals Magnetic Nanostructures: In-Situ Assembly and Exploration of Low-Dimensional Systems by Spin-Polarized Low-Energy Electron Microscopy

2006 ◽  
Vol 12 (S02) ◽  
pp. 964-965
Author(s):  
N Rougemaille ◽  
AK Schmid ◽  
M Portalupi ◽  
A Lanzara ◽  
P Biagioni ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Magnetic Nanostructures ◽  
Low Energy ◽  
Energy Electron ◽  
Spin Polarized ◽  
Low Energy Electron ◽  
Low Dimensional

Extended abstract of a paper presented at Microscopy and Microanalysis 2006 in Chicago, Illinois, USA, July 30 – August 3, 2005

Spin Polarized Low Energy Electron Microscopy of Surface Magnetic Structure

1991 ◽  
Vol 232 ◽  
Author(s):  
M. S. Altman ◽  
H. Pinkvos ◽  
J. Hurst ◽  
H. Poppa ◽  
G. Marx ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Magnetic Structure ◽  
Electron Beams ◽  
Low Energy ◽  
Energy Electron ◽  
Electron Gun ◽  
Image Subtraction ◽  
Topological Features ◽  
Spin Polarized ◽  
Low Energy Electron

ABSTRACTSpin polarized low energy electron microscopy (SPLEEM) has been developed for the high resolution imaging of surface magnetic structure. The existing LEEM ha.s been modified by the incorporation of a. GaAs-type spin polarized electron gun. Large image contrast arises due to the spin-dependent exchange scattering, whifle the st.in-orbit contribution vanishes uniquely for the normal incidence/exit geometry used here. Pixel by pixel image subtraction for incident electron beams of opposite polarization yields precisely the spatially resolved Bragg reflection asymmetry observed in spin polarized low energy electron diffraction. The shallow electron penetration depth arising from the strong coulombic interaction is advantageous for separating surface behavior from the normally overwhelning bulk. Therefore, the use of transversally polarizedI electron beams allows the determination of in-plane surface magnetization directions. Fnrthermore, the parallel illumination and detection of SPLEEM makes it possible to image quickly with a. resolution better than 500 Å in the present configuration. A useful and direct. comparison between surface magnetic, structural, and topological features is made possible by the augmentation of the unique imaging capabilities of conventional LEEM with the magnetic sensitivity of SPLEEM. In this manner, the magnetic domain structure of a Co (0001) surface and in-situ grown Co filmns on Mo(110) have been determined.

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