title: Tuning magnetic spirals beyond room temperature with chemical disorder.
abstract: In the past years, magnetism-driven ferroelectricity and gigantic magnetoelectric effects have been reported for a number of frustrated magnets featuring ordered spiral magnetic phases. Such materials are of high-current interest due to their potential for spintronics and low-power magnetoelectric devices. However, their low-magnetic ordering temperatures (typically <100 K) greatly restrict their fields of application. Here we demonstrate that the onset temperature of the spiral phase in the perovskite YBaCuFeO5can be increased by more than 150 K through a controlled manipulation of the Fe/Cu chemical disorder. Moreover, we show that this novel mechanism can stabilize the magnetic spiral state of YBaCuFeO5above the symbolic value of 25 °C at zero magnetic field. Our findings demonstrate that the properties of magnetic spirals, including its wavelength and stability range, can be engineered through the control of chemical disorder, offering a great potential for the design of materials with magnetoelectric properties beyond room temperature.
authors.affiliation: Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institut (PSI), CH-5232 Villigen, Switzerland.
authors.forename: Mickaël
authors.initials: M
authors.lastname: Morin
authors.affiliation: Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut (PSI), CH-5232 Villigen, Switzerland.
authors.forename: Emmanuel
authors.initials: E
authors.lastname: Canévet
authors.affiliation: Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institut (PSI), CH-5232 Villigen, Switzerland.
authors.forename: Adrien
authors.initials: A
authors.lastname: Raynaud
authors.affiliation: Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institut (PSI), CH-5232 Villigen, Switzerland.
authors.forename: Marek
authors.initials: M
authors.lastname: Bartkowiak
authors.affiliation: Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut (PSI), CH-5232 Villigen, Switzerland.
authors.forename: Denis
authors.initials: D
authors.lastname: Sheptyakov
authors.affiliation: Swiss Light Source, Paul Scherrer Institut (PSI), CH-5232 Villigen, Switzerland.
authors.forename: Voraksmy
authors.initials: V
authors.lastname: Ban
authors.affiliation: Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institut (PSI), CH-5232 Villigen, Switzerland.
authors.forename: Michel
authors.identifier: 0000-0001-7913-4826
authors.initials: M
authors.lastname: Kenzelmann
authors.affiliation: Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institut (PSI), CH-5232 Villigen, Switzerland.
authors.forename: Ekaterina
authors.initials: E
authors.lastname: Pomjakushina
authors.affiliation: Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institut (PSI), CH-5232 Villigen, Switzerland.
authors.forename: Kazimierz
authors.initials: K
authors.lastname: Conder
authors.affiliation: Laboratory for Scientific Developments and Novel Materials, Paul Scherrer Institut (PSI), CH-5232 Villigen, Switzerland.
authors.forename: Marisa
authors.initials: M
authors.lastname: Medarde