Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 26, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3459148
Keywords
ab initio calculations; antiferromagnetic materials; ferromagnetic materials; interface magnetism; iron; magnesium compounds; magnetic tunnelling; oxidation; tight-binding calculations
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Funding
- Nanosciences Foundation in Grenoble, France
- French National Research Agency (ANR) [ANR-09-NANO-021-03]
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The effect of structural relaxation and interfacial oxidation is demonstrated from first principles to have a crucial impact on interlayer exchange coupling (IEC) in crystalline Fe vertical bar MgO vertical bar Fe magnetic tunnel junctions (MTJs). It is shown that the IEC becomes antiferromagnetic for the relaxed structure in contrast to ferromagnetic for unrelaxed Fe vertical bar MgO vertical bar Fe MTJs. Furthermore, the antiferromagnetic IEC is strongly enhanced in the presence of oxygen vacancies while it is decreased by overoxidation and may even become ferromagnetic for sufficiently high oxygen concentration at the Fe vertical bar MgO interface. These results were supported using a tight-binding model and provide an explanation for recent experimental studies. (C) 2010 American Institute of Physics. [doi:10.1063/1.3459148]
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