ISSN:
1434-6036
Keywords:
PACS. 75.70.Pa Giant magnetoresistance – 75.30.Ds Spin waves – 73.23.Hk Coulomb blockade; single-electron tunneling
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: An extended tunneling Hamiltonian method is proposed to study the temperature-dependent tunneling magnetoresistance (TMR) in doped magnetic tunnel junctions. It is found that for nonmagnetic dopants (Si), impurity-assisted tunneling is mainly elastic, giving rise to a weak spin polarization, thereby reduces the overall TMR, while for magnetic ions (Ni), the collective excitation of local spins in δ-doped magnetic layer contributes to the severe drop of TMR and the behavior of the variation of TMR with temperature different from that for Si-doping. The theoretical results can reproduce the main characteristic features of experiments.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1140/epjb/e2003-00056-0
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