Spin reorientation induced by a very high magnetic field in domain-structuredYFeO3films: Emergence of perpendicular anisotropy

We report experiments on the static magnetic properties of ${\text{YFeO}}_{3}$ under magnetic fields up to 28 T. We studied an untwined single crystal, a sintered powder and a film of ${\text{YFeO}}_{3}$ epitaxially grown by pulsed laser deposition. We proved the relevance of a little used technique, the torque magnetometry, for investigating films having Dzyaloshinsky-Moriya interaction under very high fields. A dedicated framework for analyzing the torque signal in this particular case is also given. We proposed an original model proposed to explain the irreversibility based on the comparison of the morphologies of an experimental study made on purpose. One of the consequences of the particular morphology of films is that the net magnetic moment of the film can be permanently set perpendicular to the substrate plane, giving rise to an effective perpendicular magnetic anisotropy with a coercive field as high as 3 T at room temperature.