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Regensburg 2013 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 58: Poster Session Transport & Matter at Low Temperature

TT 58.15: Poster

Thursday, March 14, 2013, 15:00–19:00, Poster D

Anomalous Hall effect in Mn5Si3 and Mn5Si3C0.8 filmsPatrick Winkel1, •Christoph Sürgers1, Gerda Fischer1, Inga A. Fischer2, and Hilbert v. Löhneysen1,31Physikalisches Institut, KIT, Karlsruhe — 2Institut für Halbleitertechnik, Universität Stuttgart — 3Institut für Festkörperphysik, KIT, Karlsruhe

Antiferromagnetic Mn5Si3 (TN = 100 K) can be tuned ferromagnetically by incorporation of carbon [1]. The highest Curie temperature is observed for Mn5Si3C0.8 with TC = 350 K. We investigate the magnetoresistance and Hall effect of 45-nm thick films for temperatures T = 2 − 400 K and magnetic fields up to 8 T. For each temperature, the different contributions to the Hall conductivity, σxy0 and σxyAH, arising from the ordinary and anomalous Hall effect, respectively, are separated by taking into account the temperature dependence of the magnetoresistance and magnetization M.

For ferromagnetic Mn5Si3C0.8, we find a positive ordinary Hall coefficient and a linear behaviour σxyAHM similar to the isotructural ferromagnet Mn5Ge3 [2]. In contrast, a negative ordinary Hall coefficient and a nonlinear behaviour of σxyAH(M) is observed for antiferromagnetic Mn5Si3. While the negative σxy0 is attributed to the change of the electronic structure induced by carbon [3] the nonlinear σxyAH(M) awaits theoretical calculations of the anomalous Hall effect in antiferromagnetic compounds.
[1] C. Sürgers et al., Appl. Phys. Lett. 93, 062503 (2008)
C. Zeng et al., Phys. Rev. Lett. 96, 037204 (2006)
I. Slipukhina et al., Appl. Phys. Lett. 94, 192505 (2009)

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