Abstract
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.
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Notes
- 1.
A comprehensive and detail review of physical phenomena associated with emergent electromagnetic fields is provided by Ref. [1].
- 2.
Here we assume a 3D parameter space for simplicity.
- 3.
For details, see Ref. [9].
- 4.
The Eq. 3.13 can be converted to \(\frac{\rho _{yx}}{H}=R_0+S_{\mathrm {H}}\frac{\rho _{xx}^2M}{H}\) by divided by H.
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Kanazawa, N. (2015). Magnetic and Transport Properties in B20-type Germanides. In: Charge and Heat Transport Phenomena in Electronic and Spin Structures in B20-type Compounds. Springer Theses. Springer, Tokyo. https://doi.org/10.1007/978-4-431-55660-2_3
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