Abstract
The temperature dependence of the tunneling magnetoresistance and magnetization have been measured for spin-valve magnetic tunnel junctions in which the pinned magnetic electrodes is a Ni 65Cu 35 alloy with a Curie temperature of roughly 250 K. By extracting the spin polarization of the NiCu electrode using the Julliére formula, it is shown that the tunneling spin-polarization as a function of temperature can be related to the temperature-dependent magnetization. The observed quasi-linear relation between the magnetization and the tunneling spin polarization is consistent with the theoretical picture of predominantly s-electron tunneling with the spin-polarization arising via hybridization with the exchange split 3d band.
Original language | English |
---|---|
Pages (from-to) | L1-L4 |
Journal | Journal of the Korean Physical Society |
Volume | 48 |
Issue number | 1 |
State | Published - Jan 2006 |
Keywords
- Magnetic tunnel junctions
- NiCu alloy film
- Spin-polarized tunneling
- Temperature dependence of spin polarization
- Temperature dependent magnetoresistance