6533b7dcfe1ef96bd1271d7c
RESEARCH PRODUCT
Tunable Sign Change of Spin Hall Magnetoresistance in Pt/NiO/YIG Structures
Fèlix CasanovaKei YamamotoKei YamamotoKei YamamotoDazhi HouZhiyong QiuLuis E. HuesoJoseph BarkerEiji SaitohJuan M. Gomez-perezKoji SatoSaül Vélezsubject
Materials scienceCondensed matter physicsMagnetic structureMagnetoresistanceBilayerNon-blocking I/Otechnology industry and agricultureGeneral Physics and Astronomy02 engineering and technologySpin current021001 nanoscience & nanotechnology01 natural sciencesrespiratory tract diseases0103 physical sciencesotorhinolaryngologic diseases010306 general physics0210 nano-technologySign (mathematics)Spin-½description
Spin Hall magnetoresistance (SMR) has been investigated in Pt/NiO/YIG structures in a wide range of temperature and NiO thickness. The SMR shows a negative sign below a temperature that increases with the NiO thickness. This is contrary to a conventional SMR theory picture applied to the Pt/YIG bilayer, which always predicts a positive SMR. The negative SMR is found to persist even when NiO blocks the spin transmission between Pt and YIG, indicating it is governed by the spin current response of the NiO layer. We explain the negative SMR by the NiO "spin flop" coupled with YIG, which can be overridden at higher temperature by positive SMR contribution from YIG. This highlights the role of magnetic structure in antiferromagnets for transport of pure spin current in multilayers.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-04-03 | Physical Review Letters |