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Bistability and relaxor ferrimagnetism in off-stoichiometric NiCrO3
journal contribution
posted on 2017-11-20, 13:53 authored by Anna KusmartsevaAnna Kusmartseva, Angel M. Arevalo-Lopez, M. Halder, J. Paul Attfield© 2017 Elsevier B.V. NiCrO 3 has been proposed as a likely candidate for antiferromagnetic half metallic behaviour. A sample prepared at high pressure adopts the corundum structure with Ni/Cr cation disorder, and is found to have off-stoichiometric composition Ni 0.80 Cr 1.20 O 3 . This material shows complex local magnetic ordering phenomena at temperatures below 120 K but without any long range spin order observed by neutron diffraction. The transition to local ferrimagnetism occurs at 50–100 K, with two distinct regimes at T C1 = 95 and T C2 = 53 K evidencing electronic phase separation driven by variations in local composition. At low temperature the system undergoes a further transition at T C3 = 22 K, assigned to potential freezing of a cluster glass-like state, that results in a substantial increase in magnetic anisotropy. Ni 0.80 Cr 1.20 O 3 is a bistable relaxor ferrimagnet where magnetic properties are linked to the lattice strain manifold that is determined by the peculiarities in the local chemical composition.
Funding
The work was supported by the Alexander von Humboldt Foundation and the Engineering and Physical Science Research Council (EPSRC).
History
School
- Science
Department
- Physics
Published in
Journal of Magnetism and Magnetic MaterialsVolume
443Pages
293 - 299Citation
KUSMARTSEVA, A.F. ...et al., 2017. Bistability and relaxor ferrimagnetism in off-stoichiometric NiCrO3. Journal of Magnetism and Magnetic Materials, 443, pp. 293-299.Publisher
© ElsevierVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Acceptance date
2017-07-12Publication date
2017Notes
This paper is in closed access until 14th Jul 2018.ISSN
0304-8853Publisher version
Language
- en