Thin films of the spin ice compound Ho2Ti2O7
The pyrochlore compounds Ho2Ti2O7 and Dy2Ti2O7 show an exotic form of magnetism called the spin ice state, resulting from the interplay between geometrical frustration and ferromagnetic coupling.A fascinating feature of this state is the appearance of magnetic monopoles as emergent Red Shampoo excitations above the degenerate ground state.Over the