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The layered perovskite YBaCuFeO5 is a rare example of cycloidal spiral magnetwhose ordering temperature Tspiral can be tuned far beyond room temperature byadjusting the degree of Cu2+/Fe3+ chemical disorder in the structure. Thisunusual property qualifies this material as one of the most promisingspin-driven multiferroic candidates. However, very little is known about theresponse of the spiral to magnetic fields, crucial for magnetoelectriccross-control applications. Using bulk magnetization and neutron powderdiffraction measurements under magnetic fields up to 9 T we report here thefirst temperature-magnetic field phase diagram of this material. Besidesrevealing a strong stability of the spiral state, our data uncover the presenceof weak ferromagnetism coexisting with the spiral modulation. Sinceferromagnets can be easily manipulated with magnetic fields, this observationopens new perspectives for the control of the spiral orientation, directlylinked to the polarization direction, as well as for a possible future use ofthis material in technological applications.

Weak ferromagnetism linked to the high-temperature spiral phase of YBaCuFeO5