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Enhanced Ferromagnetism in Cylindrically Confined MnAs Nanocrystals Embedded in Wurtzite GaAs Nanowire Shells
Polish Acad Sci, Poland.
Polish Acad Sci, Poland.ORCID iD: 0000-0002-3532-5708
Polish Acad Sci, Poland.
Polish Acad Sci, Poland.
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2019 (English)In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 19, no 10, p. 7324-7333Article in journal (Refereed) Published
Abstract [en]

Nearly a 30% increase in the ferromagnetic phase transition temperature has been achieved in strained MnAs nanocrystals embedded in a wurtzite GaAs matrix. Wurtzite GaAs exerts tensile stress on hexagonal MnAs nanocrystals, preventing a hexagonal to orthorhombic structural phase transition, which in bulk MnAs is combined with the magnetic one. This effect results in a remarkable shift of the magneto-structural phase transition temperature from 313 K in the bulk MnAs to above 400 K in the tensely strained MnAs nanocrystals. This finding is corroborated by the state of the art transmission electron microscopy, sensitive magnetometry, and the first-principles calculations. The effect relies on defining a nanotube geometry of molecular beam epitaxy grown core-multishell wurtzite (Ga,In)As/(Ga,Al)As/(Ga,Mn)As/GaAs nanowires, where the MnAs nanocrystals are formed during the thermal-treatment-induced phase separation of wurtzite (Ga,Mn)As into the GaAs-MnAs granular system. Such a unique combination of two types of hexagonal lattices provides a possibility of attaining quasi-hydrostatic tensile strain in MnAs (impossible otherwise), leading to the substantial ferromagnetic phase transition temperature increase in this compound.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2019. Vol. 19, no 10, p. 7324-7333
Keywords [en]
Strain engineering, magnetic properties, transmission electron microscopy, nanowires, magnetic nanocrystals, molecular beam epitaxy
National Category
Physical Sciences
Research subject
Natural Science, Physics
Identifiers
URN: urn:nbn:se:lnu:diva-89869DOI: 10.1021/acs.nanolett.9b02956ISI: 000490353500078PubMedID: 31500416OAI: oai:DiVA.org:lnu-89869DiVA, id: diva2:1366906
Available from: 2019-10-31 Created: 2019-10-31 Last updated: 2019-10-31Bibliographically approved

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Sadowski, Janusz

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Kret, SlawomirKryvyi, Serhii B.Sadowski, Janusz
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