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Competing magnetic interactions in geometrically frustrated magnets give riseto new forms of correlated matter, such as spin liquids and spin ices.Characterizing the magnetic structure of these states has been difficult due tothe absence of long-range order. Here, we demonstrate that the spin Seebeckeffect (SSE) is a sensitive probe of magnetic short-range order (SRO) ingeometrically frustrated magnets. In low temperature (2 - 5 K) SSE measurementson a model frustrated magnet \mathrm{Gd_{3}Ga_{5}O_{12}}, we observemodulations in the spin current on top of a smooth background. By comparing toexisting neutron diffraction data, we find that these modulations arise fromfield-induced magnetic ordering that is short-range in nature. The observed SROis anisotropic with the direction of applied field, which is verified bytheoretical calculation.

Probing short-range magnetic order in a geometrically frustrated magnet by spin Seebeck effect