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The pyrochlore compounds Ho2Ti2O7 and Dy2Ti2O7 show an exotic form ofmagnetism called the spin ice state, resulting from the interplay betweengeometrical frustration and ferromagnetic coupling. A fascinating feature ofthis state is the appearance of magnetic monopoles as emergent excitationsabove the degenerate ground state. Over the past years, strong effort has beendevoted to the investigation of these monopoles and other properties of thespin ice state in bulk crystals. A tantalising prospect is to incorporate spinice materials into devices for spintronics and devices that can manipulate themagnetic monopoles. This would require the availability of spin ice thin films.Here, we report the fabrication of Ho2Ti2O7 thin films using pulsed laserdeposition. These films not only show a high crystalline quality, but alsoexhibit the hallmarks of a spin ice: a pronounced magnetic anisotropy and anintermediate plateau in the magnetisation along the [111] crystal direction.

Thin films of the spin ice compound Ho2Ti2O7