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Temperature in thermodynamics is synonymous with disorder, and responsiblefor ultimately destroying ordered phases. Here, we show an unusual magnetictransition where, with increasing the temperature of elemental neodymium,long-range multi-Q magnetic order emerges from a self-induced spin glass. Usingtemperature-dependent spin-polarized scanning tunneling microscopy, wecharacterize the local Q order in the spin-Q glass phase and quantify theemergence of long-range multi-Q order with increasing temperature. We developtwo distinct analysis tools, which enable the quantification of the glasstransition temperature, based on measured spatially-dependent magnetization. Wecompare these observations with atomic spin dynamics simulations, whichreproduce the qualitative observation of a phase transition from alow-temperature spin glass phase to an intermediate ordered multi-Q phase.These simulations trace the origin of the unexpected high temperature order inweakened frustration driven by temperature-dependent sublattice correlations.These findings constitute an example of order from disorder and provide a richplatform to study magnetization dynamics in a self-induced spin glass.

Thermally-induced magnetic order from glassiness in elemental neodymium