Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 49: POSTER II
MA 49.29: Poster
Donnerstag, 19. März 2015, 15:00–18:00, Poster A
Spin polarization in Co2MnGe thin films observed by magnetooptics — •rajkumar patra1, d. Bürger1, a. Bildhaiya1, n. du.1, c. fischer2, m. kreller3, h. stöcker4, b. abendroth4, s. pofahl5, o. g. schmidt5, and h. schmidt1 — 1TU Chemnitz — 2Metrolux GmbH — 3DREEBIT GmbH — 4TUBA Freiberg — 5IFW Dresden
Band theory [1] predicts that Co2MnGe Heusler alloys in L21 phase are fully spin-polarized. Here we investigate Co2MnGe thin films in L21, B2, and L21 / B2 mixed phase by magnetooptics [2]. As confirmed by XRD, three thin film samples have been prepared by dc magnetron sputtering on SQ1 glass substrates, namely one 150 nm thick sample with perfect L21 phase, one 150 nm thick sample with B2 phase, and one 200 nm thick sample in L21 / B2 mixed phase. In agreement with the electronic band structure [1] and spin polarization of Co2MnGe in L21 phase, magnetooptics reveals a strongly magnetic field dependent response in the spectral range around 3.5 eV. In addition, the spin easy-axis of a laser-treated Co2MnGe sample is rotated by ca. 30° with respect to the spin easy-axis of the pristine sample which lies along the z-axis. Because Heusler alloys with spin polarization will reveal magnetic field dependent magnetooptical features, we expect that magnetooptical investigations will play an important role in the future when characterizing Heusler alloys in different heterostructures which are highly relevant for spintronic applications [3]. [1] S. Ouardi et al., Phys. Rev. B 84 (2011), [2] K. Mok, H.S. et al., Rev. Sci. Instr. 82 (2011), [3] M. Jourdan et al., Nat. Commun. 5 (2014)