title: Design of compensated ferrimagnetic Heusler alloys for giant tunable exchange bias.
abstract: Rational material design can accelerate the discovery of materials with improved functionalities. This approach can be implemented in Heusler compounds with tunable magnetic sublattices to demonstrate unprecedented magnetic properties. Here, we have designed a family of Heusler alloys with a compensated ferrimagnetic state. In the vicinity of the compensation composition in Mn-Pt-Ga, a giant exchange bias (EB) of more than 3 T and a large coercivity are established. The large exchange anisotropy originates from the exchange interaction between the compensated host and ferrimagnetic clusters that arise from intrinsic anti-site disorder. Our design approach is also demonstrated on a second material with a magnetic transition above room temperature, Mn-Fe-Ga, exemplifying the universality of the concept and the feasibility of room-temperature applications. These findings may lead to the development of magneto-electronic devices and rare-earth-free exchange-biased hard magnets, where the second quadrant magnetization can be stabilized by the exchange bias.
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40 D-01187 Dresden, Germany.
authors.forename: Ajaya K
authors.initials: AK
authors.lastname: Nayak
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40 D-01187 Dresden, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Nicklas
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40 D-01187 Dresden, Germany.
authors.forename: Stanislav
authors.initials: S
authors.lastname: Chadov
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40 D-01187 Dresden, Germany.
authors.forename: Panchanana
authors.initials: P
authors.lastname: Khuntia
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40 D-01187 Dresden, Germany.
authors.forename: Chandra
authors.initials: C
authors.lastname: Shekhar
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40 D-01187 Dresden, Germany.
authors.forename: Adel
authors.initials: A
authors.lastname: Kalache
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40 D-01187 Dresden, Germany.
authors.forename: Michael
authors.initials: M
authors.lastname: Baenitz
authors.affiliation: Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, D-01328 Dresden, Germany.
authors.forename: Yurii
authors.initials: Y
authors.lastname: Skourski
authors.affiliation: High Field Magnet Laboratory (HFML-EMFL), Radboud University, Toernooiveld 7 6525 ED Nijmegen, The Netherlands.
authors.forename: Veerendra K
authors.initials: VK
authors.lastname: Guduru
authors.affiliation: High Field Magnet Laboratory (HFML-EMFL), Radboud University, Toernooiveld 7 6525 ED Nijmegen, The Netherlands.
authors.forename: Alessandro
authors.initials: A
authors.lastname: Puri
authors.affiliation: High Field Magnet Laboratory (HFML-EMFL), Radboud University, Toernooiveld 7 6525 ED Nijmegen, The Netherlands.
authors.forename: Uli
authors.initials: U
authors.lastname: Zeitler
authors.affiliation: School of Physics and CRANN, Trinity College, Dublin 2, Ireland.
authors.forename: J M D
authors.initials: JM
authors.lastname: Coey
authors.affiliation: Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40 D-01187 Dresden, Germany.
authors.forename: Claudia
authors.initials: C
authors.lastname: Felser