Experimental evidence consistent with a magnon Nernst effect in the antiferromagnetic insulator MnPS3

Abstract

A magnon Nernst effect, an antiferromagnetic analogue of the magnon Hall effect in ferromagnetic insulators, has been studied experimentally for a layered antiferromagnetic insulator MnPS 3 in contact with two Pt strips. Thermoelectric voltage in the Pt strips grown on MnPS 3 single crystals exhibits non-monotonic temperature dependence at low temperatures, which is unlikely to be explained by electronic origins in Pt but can be ascribed to the inverse spin Hall voltage induced by a magnon Nernst effect. Control of antiferromagnetic domains in the MnPS 3 crystal by magnetoelectric cooling is found to modulate the low-temperature thermoelectric voltage in Pt, which is evidence consistent with the emergence of the magnon Nernst effect in Pt|MnPS 3 hybrid structures.

Van der Waals magnets: Wonder building blocks for two‐dimensional spintronics?

“…We anticipate more works to appear for NiPS 3 and other members of MPX 3 . For instance, recent studies have shown exciting possibilities of making field‐effect transistors, tunneling devices, and photodetectors, using MPX 3 .…”

“…We anticipate more works to appear for NiPS 3 and other members of MPX 3 . 126,127,131,[136][137][138][139][140][141] For instance, recent studies have shown exciting possibilities of making field-effect transistors, 136,142 tunneling devices, 143 and photodetectors, 135,144 using MPX 3 . Furthermore, some MPX 3 nanosheets have been predicted to become ferromagnetic semimetals depending on charge carrier doping.…”

Magnonic topological insulators in antiferromagnets

“…The component of L ′ 12 represents the magnonic spin Nernst effect in AFs [60][61][62] where thermal gradients generate helical magnon Hall transport, and consequently, the total magnonic spin Hall current becomes nonzero. This arises from the opposite magnetic dipole moment σ = ±1 inherent to the Néel magnetic order in AF, and the effect is characterized or ensured by the Z 2 topological invariant 31,34,35,39,89 [Eq.…”

“…[111] and thermal generation of spin currents in AFs has been established experimentally in Ref. [51] using the spin Seebeck effect [52][53][54][55][56][57][58][59] , with the subsequent report [60][61][62] of magnonic spin Nernst effect in AFs. Moreover, on top of Brillouin light scattering spectroscopy 1,112,113 , using infrared camera, the realtime observation of spin-wave propagation is now possible and Ref.…”

“…[13], we developed it further into the magnonic 'quantum' Hall effect and appropriately defining the thermal conductance for bosons, we found that the magnon Hall conductances in such topological FMs obey a Wiedemann-Franz 50 (WF) law for magnon transport 4,47 . In this paper, motivated by the recent experimental 51 demonstration of thermal generation of spin currents in AFs using the spin Seebeck effect [52][53][54][55][56][57][58][59] and by the report [60][61][62] of the magnonic spin Nernst effect in AFs, we develop Ref. [46] further into the AF regime [42][43][44][45]63,64 and propose a magnonic analog of the QSHE [31][32][33][34][35]39,40 for edge states that carry helical edge magnons [ Fig.…”