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Ashani et al. Energy Mater. 2025, 5, 500111 Energy Materials
DOI: 10.20517/energymater.2025.10

Article Open Access

Giant spin Seebeck effect in two-dimensional V S O
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altermagnet

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Timothy M. Ashani , Abdullah , Jisang Hong *
Department of Physics, Pukyong National University, Busan 48513, Korea.
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Authors contributed equally.
* Correspondence to: Prof. Jisang Hong, Department of Physics, Pukyong National University, Busan 48513, Korea. E-mail:
hongj@pknu.ac.kr

How to cite this article: Ashani, T. M.; Abdullah; Hong, J. Giant spin Seebeck effect in two-dimensional V S O altermagnet.
2 2
Energy Mater. 2025, 5, 500111. https://dx.doi.org/10.20517/energymater.2025.10
Received: 14 Jan 2025 First Decision: 11 Mar 2025 Revised: 1 Apr 2025 Accepted: 17 Apr 2025 Published: 21 May 2025

Academic Editor: Sen Xin Copy Editor: Ping Zhang Production Editor: Ping Zhang

Abstract
Altermagnet is an uncommon category of antiferromagnets distinguished by their non-overlapping spin-bands,
drawing significant attention from researchers. However, while reports on their electronic and magnetic properties
are increasing rapidly, the study on the transport properties is still in early stage. Therefore, we explored the
orientational spin-dependent transport features of altermagnet V S O using Boltzmann transport technique. This
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altermagnet had 1.15 eV direct band gap energy and a critical temperature of 746 K. We obtained a directional
spin-dependent feature in the band structure whose effect spans through all the spin-dependent transport
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parameters. We found a low isotropic lattice thermal conductivity of magnitude 0.2 Wm K at 300 K. Above all,
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the V S O altermagnet displayed a giant spin-dependent Seebeck coefficient of about 1.8 mVK at 300 K and at a
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small electron or hole doping. This value is multiple times greater than reported values for most transport
materials. Besides, we also found a maximum figure of merit of 0.86 in the hole-doped systems. Thus, our findings
suggest the possibility of pure spin current generation for possible applications in spintronics and thermoelectricity.
Keywords: Spintronic, spin-dependent, altermagnetic material, spin-polarized band, and transport properties

INTRODUCTION
Altermagnetic (AM) materials are symmetry-compensated antiferromagnets whose band structures are
characterized by spin splitting . This implies that over the entire Brillouin zone, the up and down spin
[1]

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