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Manipulating carriers' spin polarization in the Heusler alloy Mn2CoAl
Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China..
Fuzhou Univ, Coll Mat Sci & Engn, Fuzhou 350100, Peoples R China..
Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China.;Beihang Univ, Ctr Integrated Computat Mat Engn, Int Res Inst Multidisciplinary Sci, Beijing 100191, Peoples R China..
Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China.;Beihang Univ, Ctr Integrated Computat Mat Engn, Int Res Inst Multidisciplinary Sci, Beijing 100191, Peoples R China..
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2015 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 5, no 90, 73814-73819 p.Article in journal (Refereed) Published
Abstract [en]

We report that complete spin polarization and controllable spin polarization of carriers can be simultaneously realized in the Heusler alloy Mn2CoAl simply by applying external pressures based on first-principles studies. At ambient conditions, Mn2CoAl is a ferromagnetic spin-gapless semiconductor (SGS) with complete spin polarization. Under hydrostatic pressures up to 40 GPa, Mn2CoAl undergoes a series of electronic transitions from SGS with spin-up as a conducting channel to a ferromagnetic semiconductor and then to SGS with spin-down as a conducting channel and finally to a half metal, during which the magnetic moment remains as 2 mB. Such rich electronic transitions are attributed to different responses of the spin-up and spin-down electrons under pressure. This work highlights a desirable way to control the carrier's spin polarization and provides a new insight into the electron behavior in Mn2CoAl related Heusler alloys under pressure.

Place, publisher, year, edition, pages
2015. Vol. 5, no 90, 73814-73819 p.
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-264684DOI: 10.1039/c5ra13673cISI: 000360860500056OAI: oai:DiVA.org:uu-264684DiVA: diva2:861267
Funder
Swedish Research Council
Available from: 2015-10-16 Created: 2015-10-15 Last updated: 2017-12-01Bibliographically approved

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Ahuja, Rajeev

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