Single crystal growth and properties of the polar ferromagnet Mn 1.05 Bi with Kagome layers, huge magnetic anisotropy and slow spin dynamics



Gibson, Quinn D, Robertson, Craig M, Dyer, Matthew S, Zanella, Marco, Surta, T Wesley, Daniels, Luke M, Claridge, John B, Alaria, Jonathan and Rosseinsky, Matthew J
(2022) Single crystal growth and properties of the polar ferromagnet Mn 1.05 Bi with Kagome layers, huge magnetic anisotropy and slow spin dynamics. Physical Review Materials, 6 (11). 114405-.

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Abstract

The synthesis, structure, and properties of single crystalline Mn1.05Bi in the polar space group Fdd2 are reported. Mn1.05Bi is isostructural to the previously reported Mn1.05Rh0.02Bi, with both ordered interstitials and ordered vacancies of Mn leading to Kagome-like layers. The ordering of the interstitials breaks inversion symmetry and forces the material into a polar space group. DC magnetization reveals ferromagnetic properties with a huge magnetic anisotropy, with the magnetization pinned along the a axis (the stacking axis), and multiple magnetic transitions which retain this anisotropy. AC measurements confirm these transitions and show very sluggish spin dynamics along the a axis, with a very large temperature-dependent out-of-phase response. Heat-capacity measurements reveal the presence of Schottky defects, and resistivity measurement confirms the transitions and reveal the material to be dominated by magnetic scattering. Overall, Mn1.05Bi shows magnetic properties markedly different from hexagonal, NiAs-type MnBi, driven by ordered interstitials and vacancies of Mn, stabilizing a likely complex magnetic structure with strongly temperature-dependent spin dynamics. This is supported by density-functional theory calculations, which suggest a strongly anisotropic noncollinear ground state driven by Kagome layers and asymmetric Mn environments.

Item Type: Article
Uncontrolled Keywords: 3402 Inorganic Chemistry, 34 Chemical Sciences, 51 Physical Sciences, 5104 Condensed Matter Physics
Divisions: Faculty of Science and Engineering > School of Physical Sciences
Depositing User: Symplectic Admin
Date Deposited: 19 Jan 2023 11:47
Last Modified: 20 Jun 2024 17:16
DOI: 10.1103/physrevmaterials.6.114405
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3167145