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Spin-Resolved Photoemission Spectroscopy of the Heusler Compound Co\(_{2}\)MnSi

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Heusler Alloys

Part of the book series: Springer Series in Materials Science ((SSMATERIALS,volume 222))

Abstract

The Heusler compound Co\(_{2}\)MnSi (CMS) is probably the most extensively studied half-metallic material. Its peculiar spin-dependent electronic properties have been addressed both theoretically and experimentally; they also already found wide application in prototypical spintronics devices. In this chapter we review our spin-resolved photoemission studies conducted on the free surface of both stoichiometric and off-stoichiometric Co\(_{2}\)Mn\(_{\alpha }\)Si samples. Our findings shed light on the peculiar dependence observed in the performance of CMS-based magnetic tunnel junctions on the Mn composition \(\alpha \). We also review our studies on the buried CMS/MgO interface, that could be directly investigated by spin-resolved low-energy photoemission spectroscopy. With this method we can then access the spin and symmetry properties of the interface electronic wave functions, which are ultimately responsible for the performance of CMS-based spintronic devices. In particular, the collected experimental data led us conclude that non-collinear spin moments at the CMS/MgO interface might be the main mechanism behind the controversially discussed temperature-dependent performance loss of state-of-the-art CMS-based magnetic tunnel junctions.

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Notes

  1. 1.

    Termination means the chemical and crystalline composition of the outermost atomic layer at the surface. In case of CMS, two different positions can be occupied by either Co, Mn or Si atoms. The bulk stack structure of CMS (100) films consists of alternating Co-Co and Mn-Si layers, hence these terminations might probably occur at the very surface. Nevertheless, further terminations such as vacancy-Si can occur due to induced defects and/or the respective surface properties which in general differ from the bulk.

  2. 2.

    This Brillouin zone part is of great interest, since it exhibits the electronic states mainly involved into the tunneling process in case of a state-of-the-art MgO single-crystalline tunnel barrier.

  3. 3.

    The photon momentum is negligible compared to the electron momentum.

  4. 4.

    Although both investigated sample systems have non-stoichiometic composition, the induced randomly distributed crystalline defects do not affect significantly the bulk band structure.

  5. 5.

    The total Mn amount value seems to be increased regarding this formula. Please note that if you sum up all relative Co and Si amounts independently of the crystal lattice position and normalize in order to achieve the Co\(_{2}\)Mn\(_{\text {Y}}\)Si\(_{\text {Z}}\) formula the originate Mn amount of 0.69 is found again.

  6. 6.

    The impact of Si\(_\mathrm{Mn}\) antisites on the electronic structure can be neglected, especially in the energy regime accessible by our experimental set-up [21].

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Acknowledgments

Financial support through the DFG/JST Research Unit 1464 ASPIMATT and FOR 1346, by the German ministry BMBF under contract 05KS10WMA is gratefully acknowledged. The work at Hokkaido University was partly supported by a Grant-in-Aid for Scientific Research (A) (Grant No. 23246055) from MEXT, Japan. We thank M. Jourdan and C. Herbort for providing us a CCFA sample for the comparison of the LEED patterns.

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  1. Department of Physics and Research Center OPTIMAS, University of Kaiserslautern, Erwin-Schrödingerstr. 46, 67663, Kaiserslautern, Germany

    Roman Fetzer, Martin Aeschlimann & Mirko Cinchetti

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    Claudia Felser

  2. Department of Electronics, University of York, York, United Kingdom

    Atsufumi Hirohata

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Fetzer, R., Aeschlimann, M., Cinchetti, M. (2016). Spin-Resolved Photoemission Spectroscopy of the Heusler Compound Co\(_{2}\)MnSi. In: Felser, C., Hirohata, A. (eds) Heusler Alloys. Springer Series in Materials Science, vol 222. Springer, Cham. https://doi.org/10.1007/978-3-319-21449-8_3

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