Anna Niemann

Address:IFW Dresden
Helmholtzstraße 20
01069 Dresden
Telephone number:+49-351-4659-798

Transport in magnetic nanowires and topological microstructures


I investigate spin-dependent transport phenomena in magnetic and topological micro- and nanostructures by means of electrical conductivity σ, thermal conductivity κ and thermopower S measurements. Samples are synthesised by electrodeposition (e.g. multilayered nanowires) or defined from bulk structures (e.g. NbP). Measurement devices are fabricted by laser beam lithography followed by a metallization process. We perform transport measurements in a broad temperature range and with magnetic fields applied in various directions. Magnetoresistance, magneto-Seebeck and magneto-thermal conductivity measurements as well as Shubnikov-de-Haas measurements are part of our characterization tools.

Figure: A multilayered Co-Ni/Cu nanowire in a typical electrical contact structure  for measureing the electrical resistivity/conductivity σ and the Seebeck coefficient S as a function of an externally applied magnetic field.




Journal papers


J. Gooth, A.C. Niemann, T. Meng, A.G. Crushin, K. Lansteiner, B. Gotsmann, F. Menges, M. Schmidt, C. Shekhar, V. Suess, R. Huehne, B. Rellinghaus, C. Felser, B. Yan, K. Nielsch: Experimental signatures of the mixed axial-gravitational anomaly in the Weyl semimetal NbP, Nature 547 (2017) Nr. 7663, S. 324-327 URL

A.-K. Michel, A.C. Niemann, T. Boehnert, S. Martens, J.P. Montero Moreno, D. Goerlitz, R. Zierold, H. Reith, V. Vega, V.M. Prida, A. Thomas, J. Gooth, K. Nielsch: Temperature gradient-induced magnetization reversal of single ferromagnetic nanowires, Journal of Physics D 50 (2017) Nr. 49, S. 494007/1-6 URL

A.C. Niemann, J. Gooth, S.-C. Wu, S. Baessler, P. Sergelius, R. Huehne, B. Rellinghaus, C. Shekhar, V. Suess, M. Schmidt, C. Felser, B. Yan, K. Nielsch: Chiral magnetoresistance in the Weyl semimetal NbP, Scientific Reports 7 (2017), S. 43394/1-6 URL


A.C. Niemann, T. Boehnert, A.-K. Michel, S. Baessler, B. Gotsmann, K. Neurohr, B. Toth, L. Peter, I. Bakonyi, V. Vega, V.M. Prida, J. Gooth, K. Nielsch: Thermoelectric Power Factor Enhancement by Spin-Polarized Currents - A Nanowire Case Study, Advanced Electronic Materials 2 (2016) Nr. 9, S. 1600058/1-8 URL

P. Sergelius, J. Gooth, S. Bassler, R. Zierold, C. Wiegand, A. Niemann, H. Reith, C. Shekhar, C. Felser, B.H. Yan, K. Nielsch: Berry phase and band structure analysis of the Weyl semimetal NbP, Scientific Reports 6 (2016), S. 33859/1-6






A. Vogel, A. C. Niemann, C. Stenner, A. Drews, M.-Y. Im, P. Fischer, and G. Meier, Vortex dynamics in triangular-shaped confining potentials. J. Appl. Phys., 112, 063916 (2012).