An emerging branch of electronics, the optospintronics, would be highly boosted if the control of
magnetic order by light is implemented in magnetic semiconductors’ nanostructures being
compatible with the actual technology. Here, we show that the ferromagnetic magnetization of low
Fe-doped ZnO nanowires prepared by carbothermal process is enhanced under illumination up to
temperatures slightly below room temperature. This enhancement is related to the existence of an
oxygen vacancy VO in the neighborhood of an antiferromagnetic superexchange Fe3+-Fe3+ pair.
Under illumination, the VO is ionized to to V+O giving an electron to a closeFe3+ ion from the antiferromagnetic
pair. This light excited electron transition allows the transition of Fe3+ to Fe2+ forming
stable ferromagnetic double exchange pairs, increasing the total magnetization. The results presented
here indicate an efficient way to influence the magnetic properties of ZnO based nanostructures
by light illumination at high temperatures.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa:de:qucosa:31213 |
| Date | 11 August 2018 |
| Creators | Lorite, Israel, Kumar, Yogesh, Esquinazi, Pablo, Friedländer, Stefan, Pöppl, Andreas, Michalsky, Tom, Meijer, Jan, Grundmann, Marius, Meyer, Thomas, Estrela-Lopis, Irina |
| Publisher | American Institute of Physics, Universität Leipzig |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, doc-type:article, info:eu-repo/semantics/article, doc-type:Text |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | 0003-6951, 1077-3118, 012401 |
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