Spin-filtering efficiency of ferrimagnetic spinels CoFe2O4 and NiFe2O4
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Journal ArticleDate:
2013Access:
OpenAccessCitation:
Nuala M. Caffrey, Daniel Fritsch, Thomas Archer, Stefano Sanvito and Claude Ederer, Spin-filtering efficiency of ferrimagnetic spinels CoFe2O4 and NiFe2O4, Physical Review B, 87, 2, 2013, 024419-Download Item:
Abstract:
We assess the potential of the ferrimagnetic spinel ferrites CoFe
2
O
4
and NiFe
2
O
4
to act as spin filtering barriers
in magnetic tunnel junctions. Our study is based on the electronic structure calculated by means of first-principles
density functional theory within different approximations for the exchange correlation energy. We show that, in
agreement with previous calculations, the density of states suggests a lower tunneling barrier for minority spin
electrons, and thus a negative spin-filter effect. However, a more detailed analysis based on the complex band
structure reveals that both signs for the spin-filtering efficiency are possible, depending on the band alignment
between the electrode and the barrier materials and depending on the specific wave-function symmetry of the
relevant bands within the electrode
Sponsor
Grant Number
Science Foundation Ireland (SFI)
G20267
European Union (EU)
E12375
Author's Homepage:
http://people.tcd.ie/sanvitoshttp://people.tcd.ie/mccaffn
Description:
PUBLISHED
Author: SANVITO, STEFANO; CAFFREY, NUALA
Sponsor:
Science Foundation Ireland (SFI)European Union (EU)
Type of material:
Journal ArticleCollections
Series/Report no:
Physical Review B87
2
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Full text availableKeywords:
exchange correlationSubject (TCD):
Nanoscience & MaterialsDOI:
http//10.1103/PhysRevB.87.024419Metadata
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