Au4Mn: A localized ferromagnet with strong spin-orbit coupling, long-rangeferromagnetic exchange, and high Curie temperature
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2022Access:
openAccessCitation:
Yangkun He, Z. Gercsi, Rui Zhang, Yu Kang, Y. Skourski, Lucy Prendeville, Orrie Larmor, Jean Besbas, Claudia Felser, Plamen Stamenov and J. M. D. Coey, Au4Mn: A localized ferromagnet with strong spin-orbit coupling, long-rangeferromagnetic exchange, and high Curie temperature, Physical Review B, 106, 2022, 214414-1 - 214414-8, 1-8Download Item:
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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
Au
4
Mn
with a Curie temperature of 385 K, where manganese has a spin moment of
4.1
μ
B
and its orbital moment is quenched. Since 80% of the atoms are gold, the spin-orbit interaction is strong and
Au
4
Mn
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
5
d
−
3
d
orbital hybridization. An induced moment of
0.05
μ
B
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
5
d
and
6
p
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.
Sponsor
Grant Number
Science Foundation Ireland (SFI)
ZEMS Project No. 16/IA/4534
Science Foundation Ireland (SFI)
MANIAC 17/NSFC/5294
Author's Homepage:
http://people.tcd.ie/venkatemhttp://people.tcd.ie/jcoey
http://people.tcd.ie/stamenp
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Journal ArticleCollections:
Series/Report no:
Physical Review B106
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Full text availableKeywords:
Exchange interaction, High magnetic fields, Magnetic anisotropy, Magnetic interactions, MagnetismSubject (TCD):
Applied physics , Condensed matter, electronic, magnetic and superconductive properties , Magnetism and spin electronics , NanotechnologyDOI:
https://doi.org/10.1103/PhysRevB.106.214414Source URI:
https://journals.aps.org/prb/pdf/10.1103/PhysRevB.106.214414ISSN:
2469-9969Licences: