Tunneling Anomalous Hall Effect (TAHE) in Ferromagnet/Superconductor Junctions

The competition of two antagonistic interactions, spin-singlet superconducting pairing and ferromagnetic exchange, in one heterojunction leads to extraordinary phenomena. Owing to the additionally broken inversion symmetry, not only the interplay of superconductivtity and ferromagnetism, but also the induced strong interfacial spin-orbit fields (SOFs) offer interesting subjects for experimental and theoretical investigations; several studies unraveled an intriguing impact of interfacial SOFs on transport already in normal-conducting systems, e.g., TAMR¹ and TAHE² effects. Our theoretical work focuses on ferromagnet/superconductor junctions, demonstrating the existence of a superconducting TAHE effect. While the effect's fundamental characteristics are comparable to what has been found in the normal-conducting analog², our numerical simulations predict a much larger tunability of the TAHE conductance in the superconducting scenario, mostly due to the presence of Andreev reflection. Together with a simultaneously generated transverse supercurrent response in the superconductor, these findings might offer an interesting future perspective for experimentalists.

¹ PRL 99, 056601 (2007)
² PRL 115, 056602 (2015)