Oscillatory Exchange Coupling and Giant Positive Magnetoresistance in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>TiN</mi><mi>/</mi><mrow><msub><mrow><mi>Fe</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow><mrow><msub><mrow><mi>O</mi></mrow><mrow><mn>4</mn></mrow></msub></mrow></math></span> Superlattices

A. Orozco; S. B. Ogale; Y. H. Li; P. Fournier; Eric Li; H. Asano; V. Smolyaninova; R. L. Greene; R. P. Sharma; R. Ramesh; T. Venkatesan

doi:10.1103/PhysRevLett.83.1680

Oscillatory Exchange Coupling and Giant Positive Magnetoresistance in $TiN / {Fe}_{3} O_{4}$ Superlattices

A. Orozco, S. B. Ogale, Y. H. Li, P. Fournier, Eric Li, H. Asano, V. Smolyaninova, R. L. Greene, R. P. Sharma, R. Ramesh, and T. Venkatesan

Phys. Rev. Lett. 83, 1680 – Published 23 August 1999

Abstract

Oscillatory exchange coupling is observed in $TiN / {Fe}_{3} O_{4}$ superlattices over length scales comparable to metallic superlattices. However, the strength of the coupling is almost an order of magnitude stronger than that commonly observed in metallic superlattices. In addition, a unique positive magnetoresistance effect is also seen. These observations are discussed in terms of the carrier confinement effects caused by the half metallicity of the magnetic layers.

Received 14 April 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.1680

Authors & Affiliations

A. Orozco^*, S. B. Ogale, Y. H. Li, P. Fournier, Eric Li, H. Asano, V. Smolyaninova, R. L. Greene, R. P. Sharma, R. Ramesh, and T. Venkatesan

NSF-MRSEC on Oxides, Surfaces and Probes and Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742-4111