Spin-charge conversion in NiMnSb Heusler alloy films.

摘要: Half-metallic Heusler alloys are attracting considerable attention because of their unique half-metallic band structures, which exhibit high spin polarization and yield huge magnetoresistance ratios. Besides serving as ferromagnetic electrodes, also have the potential to host spin-charge conversion. Here, we report on conversion effect in prototypical alloy NiMnSb. An unusual charge signal was observed with a sign change at low temperature, can be manipulated by film thickness ordering structure. It is found that has two contributions. First, interfacial contribution causes negative voltage signal, almost constant versus temperature. The second temperature dependent it dominated minority states due thermally excited magnons bulk part film. This work provides pathway for manipulation metals interface-bulk engineering spintronic devices.