Enhanced anomalous Nernst effects in ferromagnetic materials driven by Weyl nodes

Mott relation for anomalous Hall and Nernst effects in Ga1-xMnxAs ferromagnetic semiconductors.

The Mott relation between the electrical and thermoelectric transport coefficients normally holds for phenomena involving scattering. However, the anomalous Hall effect (AHE) in ferromagnets may arise from intrinsic spin-orbit interaction. In this work, we have simultaneously measured AHE and the anomalous Nernst effect (ANE) in Ga1-xMnxAs ferromagnetic semiconductor films, and observed an exce...

Scattering-independent anomalous Nernst effect in ferromagnets

Using the full-potential linearized augmented plane-wave method within the density functional theory, we compute all contributions to the scattering-independent part of the thermoelectric conductivity tensor α̂, namely, the intrinsic contribution α̂ic and the side-jump contribution α̂sj. For the ferromagnetic materials bcc Fe, hcp Co, fcc Ni, and L10 ordered alloys FePd and FePt, our investigation...

Tunable Magnon Weyl Points in Ferromagnetic Pyrochlores.

The dispersion relations of magnons in ferromagnetic pyrochlores with Dzyaloshinskii-Moriya interaction are shown to possess Weyl points, i. e., pairs of topologically nontrivial crossings of two magnon branches with opposite topological charge. As a consequence of their topological nature, their projections onto a surface are connected by magnon arcs, thereby resembling closely Fermi arcs of e...

Anomalous-Nernst and anisotropic magnetoresistive heating

Frustration in ferromagnetic materials

We examine the theory of micromagnetics developed by W. F. Brown. We show that in the case often considered, with exchange energy omitted, the minimum of the free energy is not attained for uniaxial materials but is attained for cubic materials. A study of the minimizing sequences reveals that these accurately model many features of observed domain structure. Finally, we reexamine the so-called...