Effect of Electrode and EuO Thickness on EuO-Electrode Interface in Tunneling Spin Filter

Journal Article · Sun Jan 01 04:00:00 EST 2006 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.2176590· OSTI ID:930568

Negusse, E; Holroyd, J; Liberati, M; Dvorak, J; Idzerda, Y; Santos, T; Moodera, J; Arenholz, E

The effect of electrode material and EuO film thickness on the interface between the two was studied. Of the electrodes examined, yttrium was found to decrease the formation of the nonmagnetic oxide Eu{sub 2}O{sub 3}. By decomposing the x-ray absorption spectroscopy (XAS) spectra of the samples with different electrodes against the reference EuO and Eu{sub 2}O{sub 3} spectra, the relative fraction of these two species was quantified. Multilayers with silver electrodes had the highest amount of Eu{sub 2}O{sub 3}, about 41%, whereas aluminum had 28% compared to the less than 5% observed for the multilayers with yttrium electrodes. A slight decrease in the fraction of Eu{sub 2}O{sub 3} with increasing EuO thickness was found. Angle dependent XAS measurements, done on 80 A{sup o} EuO film, indicated the presence of Eu{sub 2}O{sub 3} at high grazing angles which then decreased drastically with decreasing grazing angle. This indicated that the Eu{sub 2}O{sub 3} was localized at the EuO-electrode interface.

• Research Organization: Brookhaven National Laboratory (BNL) National Synchrotron Light Source
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 930568
• Report Number(s): BNL--80748-2008-JA
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 99; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
ALUMINIUM
ELECTRODES
EUROPIUM OXIDES
INTERFACES
SILVER
THIN FILMS
X-RAY SPECTROSCOPY
YTTRIUM
national synchrotron light source