Large anomalous Nernst effect in a van der Waals ferromagnet Fe${}_3$GeTe${}_2$

Abstract

Anomalous Nernst effect, a result of charge current driven by temperature gradient, provides a probe of the topological nature of materials due to its sensitivity to the Berry curvature near the Fermi level. Fe3GeTe2, one important member of the recently discovered two-dimensional van der Waals magnetic materials, offers a unique platform for anomalous Nernst effect because of its metallic and topological nature. Here, we report the observation of large anomalous Nernst effect in Fe3GeTe2. The anomalous Hall angle and anomalous Nernst angle are about 0.07 and 0.09 respectively, far larger than those in common ferromagnets. By utilizing the Mott relation, these large angles indicate a large Berry curvature near the Fermi level, consistent with the recent proposal for Fe3GeTe2 as a topological nodal line semimetal candidate. Our work provides evidence of Fe3GeTe2 as a topological ferromagnet, and demonstrates the feasibility of using two-dimensional magnetic materials and their band topology for spin caloritronics applications.

Nano Letters, in press

References in corpus (8)

• Magnetic 2D materials and heterostructures
• Berry phase effect in anomalous thermoelectric transport
• Universal Scaling Behavior of Anomalous Hall Effect and Anomalous Nernst Effect in Itinerant Ferromagnets
• Intrinsic vs. extrinsic anomalous Hall effect in ferromagnets
• Quantum transport theory of anomalous electric, thermoelectric, and thermal Hall effects in ferromagnets
• Mott Relation for Anomalous Hall and Nernst effects in Ga1-xMnxAs Ferromagnetic Semiconductors
• Highly efficient spin-orbit torque and switching of layered ferromagnet Fe3GeTe2
• Direct observations of chiral spin textures in van der Waals magnet Fe3GeTe2 nanolayers

Cited by in corpus (15)

• Progress and prospects in magnetic topological materials
• Topological quantum materials from the viewpoint of chemistry
• Transverse thermoelectric generation using magnetic materials
• Coexistence of Merons with Skyrmions in the Centrosymmetric van der Waals Ferromagnet Fe5GeTe2
• Strong magneto-optical and anomalous transport manifestations in two-dimensional van der Waals magnets Fe${}_n$GeTe${}_2$ ($n$ = 3, 4, 5)
• Elusive Dzyaloshinskii-Moriya interaction in Fe${}_3$GeTe${}_2$ monolayer
• Tunable magneto-optical effect, anomalous Hall effect and anomalous Nernst effect in two-dimensional room-temperature ferromagnet $1T$-CrTe${}_2$
• Spin caloritronics in a CrBr${}_3$-based magnetic van der Waals heterostructure
• Non-reciprocal magnons in a two dimensional crystal with off-plane magnetization
• Origin of negative anomalous Nernst thermopower in Mn-Ga ordered alloys
• Hexagonal Warping Induced Nonlinear Planar Nernst Effect in Nonmagnetic Topological Insulators
• Magnetoelectric effect in van der Waals magnets
• Giant Nernst Angle in Self-Intercalated van der Waals Magnet Cr${}_{1.25}$Te${}_2$
• Thermoelectric effect in kagome lattice enhanced at van Hove singularities
• Unidirectional Seebeck effect from Rashba spin-orbit coupling on the subsurface of Ge(111)