Au4Mn: A localized ferromagnet with strong spin-orbit coupling, long-range ferromagnetic exchange, and high Curie temperature

He Y, Gercsi Z, Zhang R, Kang Y, Skourski Y, Prendeville L, Larmour O, Besbas J, Felser C, Stamenov P, Coey JMD (2022)

Publication Type: Journal article

Publication year: 2022

Journal

Physical Review B American Physical Society

Book Volume: 106

Article Number: 214414

Journal Issue: 21

DOI: 10.1103/PhysRevB.106.214414

Abstract

Metallic Mn-based alloys with a nearest-neighbor Mn-Mn distance greater than 0.4 nm exhibit large, well-localized magnetic moments. Here we investigate the magnetism of tetragonal Au4Mn with a Curie temperature of 385 K, where manganese has a spin moment of 4.1μB and its orbital moment is quenched. Since 80% of the atoms are gold, the spin-orbit interaction is strong and Au4Mn exhibits uniaxial magnetocrystalline anisotropy with surface maze domains at room temperature. The magnetic hardness parameter of 1.0 is sufficient to maintain the magnetization along the c axis for a sample of any shape. Au also reduces the spin moment of Mn through 5d-3d orbital hybridization. An induced moment of 0.05μB was found on Au under a pulsed field of 40 T. Density functional theory calculations indicate that the Mn-Mn exchange is mediated by spin-polarized gold 5d and 6p electrons. The distance dependence shows that it is ferromagnetic or zero for the first ten shells of Mn neighbors out to 1.041 nm (64 atoms), and very weak and oscillatory thereafter.

Involved external institutions

Trinity College Dublin IE Ireland (IE) Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE) Helmholtz-Zentrum Dresden-Rossendorf (HZDR) DE Germany (DE)

How to cite

APA:

He, Y., Gercsi, Z., Zhang, R., Kang, Y., Skourski, Y., Prendeville, L.,... Coey, J.M.D. (2022). Au4Mn: A localized ferromagnet with strong spin-orbit coupling, long-range ferromagnetic exchange, and high Curie temperature. Physical Review B, 106(21). https://dx.doi.org/10.1103/PhysRevB.106.214414

MLA:

He, Yangkun, et al. "Au4Mn: A localized ferromagnet with strong spin-orbit coupling, long-range ferromagnetic exchange, and high Curie temperature." Physical Review B 106.21 (2022).

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