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Negative spin polarization of theFe3O4∕γ−Al2O3interface measured by spin-resolved photoemission
- Source :
- Physical Review B. 73
- Publication Year :
- 2006
- Publisher :
- American Physical Society (APS), 2006.
-
Abstract
- The discovery of giant magnetoresistance in Fe/ Cr multilayers 1 has been followed by a large research effort for almost two decades aiming at developing new materials suitable for spintronics. The interest of a given material is mainly expressed by its spin polarization P =N↑ �N↓ /N↑ +N↓, N↑ N↓ standing for majority spin minority spin electron density of states at the Fermi level. This property is particularly important for magnetic tunnel junctions stacks of two magnetic electrodes separated by a thin insulating layer. 2 Indeed, the tunnel magnetoresistance TMR, corresponding to the variation of resistance between parallel and antiparallel configurations of the electrode magnetizations, is given in a simple view by the Julliere formula: 3 TMR =2 P1P2 / 1� P1P2, P1 and P2 being the spin polarizations of the two electrodes. Magnetite Fe3O4 is thus expected to be an interesting electrode material, for band structure calculations predict a half metallic behavior P = �100%, the con
- Subjects :
- Materials science
Spintronics
Condensed matter physics
Spin polarization
Fermi level
Heterojunction
Giant magnetoresistance
Condensed Matter::Mesoscopic Systems and Quantum Hall Effect
Condensed Matter Physics
Electronic, Optical and Magnetic Materials
Condensed Matter::Materials Science
Tunnel magnetoresistance
symbols.namesake
Spinplasmonics
symbols
Condensed Matter::Strongly Correlated Electrons
Electronic band structure
Subjects
Details
- ISSN :
- 1550235X and 10980121
- Volume :
- 73
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........1d8a568c5b3d764a6803c51b9bb905d6