Low Temperature Suppression of the Spin Nernst Angle in Pt

Abstract

We demonstrate the low temperature suppression of the platinum (Pt) spin Nernst angle in bilayers consisting of the antiferromagnetic insulator hematite ($\alpha$-Fe${}_2$O${}_3$) and Pt upon measuring the transverse spin Nernst magnetothermopower (TSNM). We show that the observed signal stems from the interplay between the interfacial spin accumulation in Pt originating from the spin Nernst effect and the orientation of the Néel vector of $\alpha$-Fe${}_2$O${}_3$, rather than its net magnetization. Since the latter is negligible in an antiferromagnet, our device is superior to ferromagnetic structures, allowing to unambiguously distinguish the TSNM from thermally excited magnon transport (TMT), which usually dominates in ferri/ferromagnets due to their non-zero magnetization. Evaluating the temperature dependence of the effect, we observe a vanishing TSNM below ~100 K. We compare these results with theoretical calculations of the temperature dependent spin Nernst conductivity and find excellent agreement. This provides evidence for a vanishing spin Nernst angle of Pt at low temperatures and the dominance of extrinsic contributions to the spin Nernst effect.

arXiv comment4 pages, 4 figures

References in corpus (31)

• Direct electronic measurement of the spin Hall effect
• Experimental observation of the spin-Hall effect in a two dimensional spin-orbit coupled semiconductor system
• Spin Hall Magnetoresistance Induced by a Non-Equilibrium Proximity Effect
• Long distance transport of magnon spin information in a magnetic insulator at room temperature
• Theory of spin Hall magnetoresistance
• Observation of the Spin-Seebeck Effect in a Ferromagnetic Semiconductor
• Electrically controlled long-distance spin transport through an antiferromagnetic insulator
• Quantitative study of the spin Hall magnetoresistance in ferromagnetic insulator/normal metal hybrids
• Spin Hall effect transistor
• Observation of the spin Peltier effect
• Cooling and heating with electron spins: Observation of the spin Peltier effect
• Observation of the spin Nernst effect
• Spin Hall magnetoresistance in antiferromagnet/heavy-metal heterostructures
• Negative spin Hall magnetoresistance of Pt on the bulk easy-plane antiferromagnet NiO
• The Spin Nernst effect in Tungsten
• Ultrafast Switching of Antiferromagnets via Spin-transfer Torque
• Temperature dependent spin transport properties of Platinum inferred from spin Hall magnetoresistance measurements
• Magnon based logic in a multi-terminal YIG/Pt nanostructure
• Observation of Antiferromagnetic Magnon Pseudospin Dynamics and the Hanle effect
• Propagation length of antiferromagnetic magnons governed by domain configurations
• Spin transport in a magnetic insulator with zero effective damping
• Large spin Hall magnetoresistance in antiferromagnetic α-Fe2O3/Pt heterostructures
• Observation of transverse spin Nernst magnetoresistance induced by thermal spin current in ferromagnet/non-magnet bilayers
• Observation of Spin Nernst effect in Platinum
• A first-principles linear response description of the spin Nernst effect
• Supplemental Material to "A first-principles linear response description of the spin Nernst effect"
• Spin Hall magnetoresistance in antiferromagnetic insulators
• Absolute Seebeck coefficient of thin platinum films
• Temperature dependence of the effective spin-mixing conductance probed with lateral non-local spin valves
• Anomalous spin Hall angle of a metallic ferromagnet determined by a multiterminal spin injection/detection device
• Quantitative comparison of magnon transport experiments in three-terminal YIG/Pt nanostructures acquired via dc and ac detection techniques

Cited by in corpus (1)

• Observation of nonreciprocal magnon Hanle effect