AI Article Synopsis
- Researchers have discovered unidirectional spin Hall magnetoresistance (USMR) in bilayers made of platinum (Pt) and the antiferromagnetic insulator α-Fe₂O₃.
- The USMR's origin is linked to the dynamics of antiferromagnetic magnons influenced by spin orbit torque and thermal effects, differing from behaviors seen in ferromagnetic materials.
- This discovery broadens the potential applications of USMR for detecting antiferromagnetic spin states with high sensitivity.
Article Abstract
Unidirectional spin Hall magnetoresistance (USMR) has been widely reported in the heavy metal/ferromagnet bilayer systems. We observe the USMR in Pt/α-Fe_{2}O_{3} bilayers where the α-Fe_{2}O_{3} is an antiferromagnetic (AFM) insulator. Systematic field and temperature dependent measurements confirm the magnonic origin of the USMR. The appearance of AFM-USMR is driven by the imbalance of creation and annihilation of AFM magnons by spin orbit torque due to the thermal random field. However, unlike its ferromagnetic counterpart, theoretical modeling reveals that the USMR in Pt/α-Fe_{2}O_{3} is determined by the antiferromagtic magnon number with a non-monotonic field dependence. Our findings extend the generality of the USMR which pave the ways for the highly sensitive detection of AFM spin state.
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| http://dx.doi.org/10.1103/PhysRevLett.130.086703 | DOI Listing |
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