Magnetic phase diagram of epitaxial dysprosium

We have determined the magnetic phase diagram of Dy as a function of epitaxial strain {ε}, applied field H, and temperature T. $roman Y sub x roman Lu sub 1-x--- alloys were employed as templates to clamp the films at selected strains. The separate roles of epitaxial clamping and strain are identified for the first time. There is a clearly defined transition as the strain is changed at low temperature from the clamped helical phase to the ferromagnetic phase. The transition is modeled by a linear coupling treatment of the magnetoelastic strains.