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20 April 2024 |
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Article overview
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Spin-charge conversion in NiMnSb Heusler alloy films | | Zhenchao Wen
; Zhiyong Qiu
; Sebastian Tolle
; Cosimo Gorini
; Takeshi Seki
; Dazhi Hou
; Takahide Kubota
; Ulrich Eckern
; Eiji Saitoh
; Koki Takanashi
; | | Date: |
20 Feb 2019 | | Abstract: | 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, Heusler alloys also have the potential to host spin-charge
conversion which has been recently demonstrated in other ferromagnetic metals.
Here, we report on the spin-charge conversion effect in the prototypical
Heusler alloy NiMnSb. Spin currents were injected from Y3Fe5O12 into NiMnSb
films by spin pumping, and then the spin currents were converted to charge
currents via spin-orbit interactions. Interestingly, an unusual charge signal
was observed with a sign change at low temperature, which can be manipulated by
film thickness and ordering structure. It is found that the spin-charge
conversion has two contributions. First, the interfacial contribution causes a
negative voltage signal, which is almost constant versus temperature. The
second contribution is temperature dependent because it is dominated by
minority states due to thermally excited magnons in the bulk part of the film.
This work provides a pathway for the manipulation of spin-charge conversion in
ferromagnetic metals by interface-bulk engineering for spintronic devices. | | Source: | arXiv, 1902.7406 | | Services: | Forum | Review | PDF | Favorites | |
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