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Nat Mater. 2015 Jul;14(7):679-84. doi: 10.1038/nmat4248. Epub 2015 Mar 16.

Design of compensated ferrimagnetic Heusler alloys for giant tunable exchange bias.

Author information

1
Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Str. 40 D-01187 Dresden, Germany.
2
Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, D-01328 Dresden, Germany.
3
High Field Magnet Laboratory (HFML-EMFL), Radboud University, Toernooiveld 7 6525 ED Nijmegen, The Netherlands.
4
School of Physics and CRANN, Trinity College, Dublin 2, Ireland.

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.

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PMID:
25774953
DOI:
10.1038/nmat4248

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