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Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 10: Heusler Compounds, Semimetals and Oxides (joint session MA/TT)

TT 10.9: Vortrag

Montag, 12. März 2018, 11:45–12:00, EB 301

NMR investigations of irradiation-induced structural changes in Co2MnSi thin films — •Franziska Hammerath1, Mira R. D. Brandt1, Rantej Bali2, Kay Potzger2, Roman Böttger2, Rene Hübner2, Yuya Sakuraba3, Bernd Büchner1, and Sabine Wurmehl11IFW Dresden, Institute for Solid State Research, Helmholtzstraße 20, 01069 Dresden — 2Institute of Ion Beam Physics and Materials Research, HZDR, Bautzner Straße 400, 01328 Dresden, Germany — 3National Institute for Materials Science (NIMS), Sengen 1-2-1, Tsukuba, Ibaraki 305-0047, Japan

Co2MnSi is a well-known Heusler compound which is predicted to be half-metallic, i.e., possessing 100% spin-polarization and, thus, being a promising candidate material for enhancing the magneto-resistance of spin-valves [1]. Half-metallicity depends sensitively on the local chemical order, hence methods to improve the structure of Co2MnSi towards the ideal L21 order and, thus, to achieve full spin-polarization are of huge technological relevance. On the basis of XRD measurements it has been argued that irradiation with He+ ions induces an improvement of B2-order in Co2MnSi thin films towards a possible formation of L21 order [2]. We investigated the structure-property relationship of He+-irradiated Co2MnSi alloy thin films locally by means of 59Co nuclear magnetic resonance (NMR) and observed an increased disorder upon increasing the ion flux, going along with a decrease of the saturation magnetization.

[1] T. Iwase et al., Appl. Phys. Express 2, 063003 (2009).

[2] O. Gaier et al., Appl. Phys. Lett. 94, 152508 (2009).

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