| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Bellet-Amalric, Edith
CEA Grenoble
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2024Role of a capping layer on the crystalline structure of Sn thin films grown at cryogenic temperatures on InSb substratescitations
- 2023Role of a capping layer on the crystalline structure of Sn thin films grown at cryogenic temperatures on InSb substratescitations
- 2022200 mm-scale growth of 2D layered GaSe with preferential orientationcitations
- 2019Three-phase metal-insulator transition and structural alternative for a VO2 film epitaxially grown on Al2O3(0001)citations
- 2014Boron-doped superlattices and Bragg mirrors in diamondcitations
- 2011Strain relaxation in GaN/Al0.1Ga0.9N superlattices for mid-infrared intersubband absorptioncitations
- 2007Structure and magnetism of self-organized Ge(1-x)Mn(x) nano-columnscitations
- 2006High-Curie-temperature ferromagnetism in self-organized GeMn nanocolumns
- 2006Intrinsic ferromagnetism in wurtzite (Ga,Mn)N semiconductorcitations
- 2005X-ray absorption near-edge structure and valence state of Mn in (Ga,Mn)Ncitations
Places of action
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article
High-Curie-temperature ferromagnetism in self-organized GeMn nanocolumns
Abstract
The emerging field of spintronics would be dramatically boosted if room-temperature ferromagnetism could be added to semiconductor nanostructures that are compatible with silicon technology. Here, we report a high-TC (>400 K) ferromagnetic phase of (Ge,Mn) epitaxial layer. The manganese content is 6%, and careful structural and chemical analyses show that the Mn distribution is strongly inhomogeneous: we observe eutectoid growth of well-defined Mn-rich nanocolumns surrounded by a Mn-poor matrix. The average diameter of these nanocolumns is 3 nm and their spacing is 10nm. Their composition is close to Ge2Mn, which corresponds to an unknown germanium-rich phase, and they have a uniaxially elongated diamond structure. Their Curie temperature is higher than 400 K. Magnetotransport reveals a pronounced anomalous Hall effect up to room temperature. A giant positive magnetoresistance is measured from 7,000% at 30K to 200% at 300K and 9 T, with no evidence of saturation.