| Autor: |
He C; Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA., Grutter AJ, Gu M, Browning ND, Takamura Y, Kirby BJ, Borchers JA, Kim JW, Fitzsimmons MR, Zhai X, Mehta VV, Wong FJ, Suzuki Y |
| Jazyk: |
angličtina |
| Zdroj: |
Physical review letters [Phys Rev Lett] 2012 Nov 09; Vol. 109 (19), pp. 197202. Date of Electronic Publication: 2012 Nov 07. |
| DOI: |
10.1103/PhysRevLett.109.197202 |
| Abstrakt: |
We have found ferromagnetism in epitaxially grown superlattices of CaRuO(3)/CaMnO(3) that arises in one unit cell at the interface. Scanning transmission electron microscopy and electron energy loss spectroscopy indicate that the difference in magnitude of the Mn valence states between the center of the CaMnO(3) layer and the interface region is consistent with double exchange interaction among the Mn ions at the interface. Polarized neutron reflectivity and the CaMnO(3) thickness dependence of the exchange bias field together indicate that the interfacial ferromagnetism is only limited to one unit cell of CaMnO(3) at each interface. The interfacial moment alternates between the 1 μ(B)/interface Mn ion for even CaMnO(3) layers and the 0.5 μ(B)/interface Mn ion for odd CaMnO(3) layers. This modulation, combined with the exchange bias, suggests the presence of a modulating interlayer coupling between neighboring ferromagnetic interfaces via the antiferromagnetic CaMnO(3) layers. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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