تقرير
Biaxial Strain in the Hexagonal Plane of MnAs Thin Films: The Key to Stabilize Ferromagnetism to Higher Temperature
العنوان: | Biaxial Strain in the Hexagonal Plane of MnAs Thin Films: The Key to Stabilize Ferromagnetism to Higher Temperature |
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المؤلفون: | Garcia, V., Sidis, Y., Marangolo, M., Vidal, F., Eddrief, M., Bourges, P., Maccherozzi, F., Ott, F., Panaccione, G., Etgens, V. H. |
سنة النشر: | 2007 |
المجموعة: | Condensed Matter |
مصطلحات موضوعية: | Condensed Matter - Materials Science |
الوصف: | The alpha-beta magneto-structural phase transition in MnAs/GaAs(111) epilayers is investigated by elastic neutron scattering. The in-plane parameter of MnAs remains almost constant with temperature from 100 K to 420 K, following the thermal evolution of the GaAs substrate. This induces a temperature dependent biaxial strain that is responsible for an alpha-beta phase coexistence and, more important, for the stabilization of the ferromagnetic alpha-phase at higher temperature than in bulk. We explain the premature appearance of the beta-phase at 275 K and the persistence of the ferromagnetic alpha-phase up to 350 K with thermodynamical arguments based on the MnAs phase diagram. It results that the biaxial strain in the hexagonal plane is the key parameter to extend the ferromagnetic phase well over room temperature. Comment: 4 pages, 3 figures, accepted for publication in Physical Review Letters |
نوع الوثيقة: | Working Paper |
DOI: | 10.1103/PhysRevLett.99.117205 |
URL الوصول: | http://arxiv.org/abs/0708.0350 |
رقم الأكسشن: | edsarx.0708.0350 |
قاعدة البيانات: | arXiv |
DOI: | 10.1103/PhysRevLett.99.117205 |
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