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Giant spontaneous exchange bias in an antiperovskite structure driven by a canted triangular magnetic structure

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Abstract

Exchange bias (EB) effect, generally observed in systems consisting of ferromagnetic and antiferromagnetic layers after a cooling procedure in a high magnetic field, is highly desirable for technological applications ranging from spintronics to magnetic recording. Achieving a giant EB effect near room temperature in a small cooling field is thus an on-going technologically relevant challenge for the materials science community. In this work, we present the experimental realization of such a fundamental goal by demonstrating the existence of giant EB after a zero field cooled (ZFC) procedure in antiperovskite Mn3.5Co0.5N below 256 K. We found that it exhibits an EB field of −0.28 T at 50 K after a ZFC procedure accompanied by a large vertical magnetization shift (VMS). Interestingly, this EB field can be elevated up to −1.2 T after a cooling procedure with a small applied field of just 500 Oe. Mn3.5Co0.5N represents the first intermetallic material showing a strong correlation between EB and VMS. We attribute the observed EB effect to a new canted triangular magnetic structure in antiperovskites determined by a neutron diffraction experiment. Finally, we discuss the striking effect of Co substitution on the physical properties of antiperovskite materials and put forward a new strategy for the antiperovskite lattice to exploit new single phase materials showing large EB effect at room temperature.

Graphical abstract: Giant spontaneous exchange bias in an antiperovskite structure driven by a canted triangular magnetic structure

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Publication details

The article was received on 04 Jan 2018, accepted on 18 Oct 2018 and first published on 18 Oct 2018


Article type: Communication
DOI: 10.1039/C8MH00019K
Citation: Mater. Horiz., 2019, Advance Article
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    Giant spontaneous exchange bias in an antiperovskite structure driven by a canted triangular magnetic structure

    L. Ding, L. Chu, P. Manuel, F. Orlandi, M. Li, Y. Guo and Z. Liu, Mater. Horiz., 2019, Advance Article , DOI: 10.1039/C8MH00019K

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