Applied Physics

Half-Metallic Manganites

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Science  31 Jan 2003:
Vol. 299, Issue 5607, pp. 627
DOI: 10.1126/science.299.5607.627d

Magnetic tunnel junctions control current based on spin rather than electric field. They consist of two ferromagnetic electrodes separated by a thin oxide layer. The amount of current transported across the junction depends only on the relative spin polarization of the two outer layers, much like light traveling through a polarized lens. These simple devices are attractive as magnetic memory elements and as a source of polarized electrons in spintronics applications. However, the main issue hindering progress has been finding a material with a high degree of polarization. Bowen et al. present transport measurements of magnetic tunnel junctions with the manganite La2/3Sr1/3MnO3 as the electrode material. The results suggest an electrode spin polarization of at least 95%, revealing a marked improvement over current magnetic tunnel junction device structures. — ISO

Appl. Phys. Lett.82, 233 (2003).

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