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  Probing the electronic states of high-TMR off-stoichiometric Co2MnSi thin films by hard x-ray photoelectron spectroscopy

Kozina, X., Karel, J., Ouardi, S., Chadov, S., Fecher, G. H., Felser, C., et al. (2014). Probing the electronic states of high-TMR off-stoichiometric Co2MnSi thin films by hard x-ray photoelectron spectroscopy. Physical Review B, 89(12): 125116, pp. 1-10. doi:10.1103/PhysRevB.89.125116.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-BBE8-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0018-BBF3-2
Genre: Journal Article

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Kozina, Xeniya1, Author
Karel, Julie2, Author              
Ouardi, Siham3, Author              
Chadov, Stanislav4, Author              
Fecher, Gerhard H.5, Author              
Felser, Claudia6, Author              
Stryganyuk, Gregory1, Author
Balke, Benjamin1, Author
Ishikawa, Takayuki1, Author
Uemura, Tetsuya1, Author
Yamamoto, Masafumi1, Author
Ikenaga, Eiji1, Author
Ueda, Shigenori1, Author
Kobayashi, Keisuke1, Author
Affiliations:
1external, ou_persistent22              
2Julie Karel, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863434              
3Siham Ouardi, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863439              
4Stanislav Chadov, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863440              
5Gerhard Fecher, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863431              
6Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: The tunnel magnetoresistance ratio (TMR) of fully epitaxial magnetic tunnel junctions with an off-stoichiometric Co2MnSi Heusler alloy has been shown to exhibit a systematic dependence on Mn content, reaching 1135% at 4.2 K for Co2Mn1.29Si. In this paper, we explain the behavior of the observed TMR ratio using ab initio calculations and hard x-ray photoelectron spectroscopy (HAXPES). For the Mn-deficient samples, we show that the the drop of the TMR is caused by Co antisite atoms, which impose extra states into the minority-spin band gap. On the other hand, Mn-excess composition shows nearly half-metallic behavior. This result can be intuitively understood since both Co2MnSi and Mn2CoSi are theoretically predicted to be half-metallic ferromagnets.

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 Dates: 2014-03-17
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: DOI: 10.1103/PhysRevB.89.125116
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Title: Physical Review B
  Other : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 89 (12) Sequence Number: 125116 Start / End Page: 1 - 10 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008