Seebeck-driven transverse thermoelectric generation in on-chip devices

Abstract

An unconventional approach to enhance the transverse thermopower by combining magnetic and thermoelectric materials, namely the Seebeck-driven transverse thermoelectric generation (STTG), has been proposed and demonstrated recently. Here, we improve on the previously used sample structure and achieve large transverse thermopower over 40 $\mu$V K${}^{-1}$ due to STTG in on-chip devices. We deposited polycrystalline Fe-Ga alloy films directly on n-type Si substrates, where Fe-Ga and Si serve as the magnetic and thermoelectric materials, respectively. Using microfabrication, contact holes were created through the SiO${}_x$ layer at the top of Si to electrically connect the Fe-Ga film with the Si substrate. These thin devices with simple structure clearly exhibited enhancement of transverse thermopower due to STTG, and the obtained values agreed well with the estimation over a wide range of the size ratio between the Fe-Ga film and the Si substrate.

arXiv comment8 pages, 7 figures

References in corpus (24)

• Spin Caloritronics
• Large anomalous Nernst effect at room temperature in a chiral antiferromagnet
• Giant anomalous Nernst effect and quantum-critical scaling in a ferromagnetic semimetal
• Zero-field Nernst effect in a ferromagnetic kagome-lattice Weyl-semimetal Co3Sn2S2
• Anomalous Nernst effect beyond the magnetization scaling relation in the ferromagnetic Heusler compound Co${}_2$MnGa
• Anomalous Nernst and Righi-Leduc effects in Mn${}_3$Sn: Berry curvature and entropy flow
• Thermoelectric generation based on spin Seebeck effects
• Berry curvature unravelled by the Nernst effect in Mn${}_3$Ge
• Transverse thermoelectric generation using magnetic materials
• Proximity-free enhancement of anomalous Nernst effects in metallic multilayers
• Fermi level tuning and atomic ordering induced giant anomalous Nernst effect in Co2MnAl1-xSix Heusler alloy
• Spin-polarized Weyl cones and gigantic anomalous Nernst effect in ferromagnetic Heusler films
• Anomalous transverse response of Co${}_2$MnGa and universality of the room-temperature ${\alpha }_{ij}^A/{\sigma }_{ij}^A$ ratio across topological magnets
• Heat flux sensing by anomalous Nernst effect in Fe-Al thin films on a flexible substrate
• Observation of anomalous Ettingshausen effect and large transverse thermoelectric conductivity in permanent magnets
• Intrinsic anomalous Nernst effect amplified by disorder in a half-metallic semimetal
• Thickness dependent tuning of the Berry curvature in a ferromagnetic Weyl semimetal
• Scalable Nernst Thermoelectric Power using a Coiled Galfenol Wire
• Anomalous Hall and Nernst effects in epitaxial films of topological kagome magnet Fe3Sn2
• Enhancement of anomalous Nernst effect in Ni/Pt superlattice
• Anomalous Hall and Nernst effects in ferrimagnetic Mn${}_4$N films: possible interpretation and prospect for enhancement
• Combinatorial tuning of electronic structure and thermoelectric properties in Co${}_2$MnAl${}_{1-x}$Si${}_x$ Weyl semimetals
• Phenomenological analysis of transverse thermoelectric generation and cooling performance in magnetic/thermoelectric hybrid systems
• Origin of negative anomalous Nernst thermopower in Mn-Ga ordered alloys

Cited by in corpus (3)

• Seebeck-driven transverse thermoelectric generation in magnetic hybrid bulk materials
• Direct electrical probing of anomalous Nernst conductivity
• Cooperative Nernst Effect of Multilayer Systems: Parallel Circuit Model Study