Half-metallic ferromagnets for magnetic tunnel junctions

Details Half-metallic ferromagnets for magnetic tunnel junctions Half-metallic ferromagnets for magnetic tunnel junctions

2005-06-03

arxiv.org/abs/cond-mat/0506079v1

Phys. Rev. B 72, 174428 (2005)

Physics

Condensed Matter

Materials Science

Scientific paper

10.1103/PhysRevB.72.174428

Using theoretical arguments, we show that, in order to exploit half-metallic ferromagnets in tunneling magnetoresistance (TMR) junctions, it is crucial to eliminate interface states at the Fermi level within the half-metallic gap; contrary to this, no such problem arises in giant magnetoresistance elements. Moreover, based on an a priori understanding of the electronic structure, we propose an antiferromagnetically coupled TMR element, in which interface states are eliminated, as a paradigm of materials design from first principles. Our conclusions are supported by ab-initio calculations.

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