| Autor: |
Hans, Boschker, Jaap, Kautz, Evert P, Houwman, Wolter, Siemons, Dave H A, Blank, Mark, Huijben, Gertjan, Koster, Arturas, Vailionis, Guus, Rijnders |
| Rok vydání: |
2011 |
| Zdroj: |
Physical review letters. 109(15) |
| ISSN: |
1079-7114 |
| Popis: |
We present a study of the thickness dependence of magnetism and electrical conductivity in ultrathin La0.67Sr0.33MnO3 films grown on SrTiO3 (110) substrates. We found a critical thickness of 10 unit cells below which the conductivity of the films disappeared and simultaneously the Curie temperature increased, indicating a magnetic insulating phase at room temperature. These samples have a Curie temperature of about 560 K with a significant saturation magnetization of 1.2±0.2μ(B)/Mn. The canted antiferromagnetic insulating phase in ultra thin films of n10 coincides with the occurrence of a higher symmetry structural phase with a different oxygen octahedra rotation pattern. Such a strain engineered phase is an interesting candidate for an insulating tunneling barrier in room temperature spin polarized tunneling devices. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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