Magnetic and Transport Properties in B20-type Germanides

Part of the Springer Theses book series (Springer Theses)


We overview magnetization and electrical-transport properties of a series of B20-type germanides. From systematic measurements of those properties, especially by determining the critical magnetic field \(H_{\mathrm {c}}\), we can roughly estimate change in helical period with a variation of the composition. The helical period changes by two orders of magnitude: the shortest period (\(\approx \)3 nm) in MnGe and a diverging behavior of the period at Mn\(_{1-x}\)Fe\(_x\)Ge (\(x=0.8\)), which is also confirmed by a collaborative work using Lorentz transmission electron microscopy (LTEM). The large variation is due to a change in Dzyaloshinsky-Moriya (DM) interaction, which crosses zero at the diverging point. Anomalous Hall effect in the Mn\(_{1-x}\)Fe\(_x\)Ge system also scales the variation of the DM interaction.


Hall Current Berry Phase Hall Conductivity Helical Magnet Anomalous Hall Effect 


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© Springer Japan 2015

Authors and Affiliations

  1. 1.Department of Applied PhysicsThe University of TokyoTokyoJapan

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