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Title: Low-temperature MnBi alloys: Electronic and magnetic properties, constitution, morphology and fabrication (Review article)

Abstract

The article reviews the rich phenomena of physical properties of MnBi. The diverse phenomena include strong spin-orbit interaction, anomalous temperature dependence of the coercivity and the magneto-crystalline anisotropy field, unique magneto-optical properties. Issues addressed include the nature of the electronic ground states of MnBi, the electronic and magnetic structures, Fermi surface, magneto-crystalline anisotropy, x-ray magnetic dichroism. The discussion includes key experiments, such as optical and magneto-optical spectroscopic measurements, de Haas-van Alphen (dHvA) measurements, x-ray photoemission and x-ray absorption spectroscopy measurements as well as x-ray magnetic circular dichroism. The effect of the spin-orbit (SO) interaction and Coulomb repulsion U were found to be crucial for the Fermi surface, cyclotron masses, magneto-optical properties, and x-ray magnetic circular dichroism. The microscopic origin of unique magneto-crystalline anisotropy and giant Kerr effect in MnBi is analyzed in detail. The huge Kerr effect in MnBi is caused by the combination of a sizable magnetic moment on manganese, the large spin-orbit coupling of bismuth, and a strong hybridization between the manganese 3d and the bismuth 6p states. The magneto-optically active states are mainly the 6p states of Bi. We show that the observed temperature dependence of the magneto-crystalline anisotropy can be explained taking into account the spin-orbitmore » interaction together with strong Coulomb electron-electron interaction. The SO coupling of Bi is equally responsible for the large magneto-crystalline anisotropy energy as is the exchange splitting of Mn. The fabrication, morphology, and constitution of low-temperature MnBi alloys in bulk, thin films, and nanoparticles are discussed. The nanocomposite permanent magnetic materials based on MnBi, (Co, Fe) and Nd 2Fe 14B are also discussed.« less

Authors:
 [1];  [2]
  1. NAS of Ukraine, Kyiv (Ukraine). G. V. Kurdyumov Inst. for Metal Physics; Ames Lab., Ames, IA (United States)
  2. Ames Lab., Ames, IA (United States)
Publication Date:
Research Org.:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1599882
Report Number(s):
[IS-J-10151]
[Journal ID: ISSN 1063-777X]
Grant/Contract Number:  
[AC02-07CH11358]
Resource Type:
Accepted Manuscript
Journal Name:
Low Temperature Physics
Additional Journal Information:
[ Journal Volume: 46; Journal Issue: 1]; Journal ID: ISSN 1063-777X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Fermi surface; Electromagnetism; X-ray magnetic circular dichroism spectroscopy; Cyclotrons; Spin-orbit interactions; Materials properties; Magnetic materials; Thin films; Magnetic anisotropy; Kerr effects

Citation Formats

Antonov, V. N., and Antropov, V. P. Low-temperature MnBi alloys: Electronic and magnetic properties, constitution, morphology and fabrication (Review article). United States: N. p., 2020. Web. doi:10.1063/10.0000360.
Antonov, V. N., & Antropov, V. P. Low-temperature MnBi alloys: Electronic and magnetic properties, constitution, morphology and fabrication (Review article). United States. doi:10.1063/10.0000360.
Antonov, V. N., and Antropov, V. P. Thu . "Low-temperature MnBi alloys: Electronic and magnetic properties, constitution, morphology and fabrication (Review article)". United States. doi:10.1063/10.0000360.
@article{osti_1599882,
title = {Low-temperature MnBi alloys: Electronic and magnetic properties, constitution, morphology and fabrication (Review article)},
author = {Antonov, V. N. and Antropov, V. P.},
abstractNote = {The article reviews the rich phenomena of physical properties of MnBi. The diverse phenomena include strong spin-orbit interaction, anomalous temperature dependence of the coercivity and the magneto-crystalline anisotropy field, unique magneto-optical properties. Issues addressed include the nature of the electronic ground states of MnBi, the electronic and magnetic structures, Fermi surface, magneto-crystalline anisotropy, x-ray magnetic dichroism. The discussion includes key experiments, such as optical and magneto-optical spectroscopic measurements, de Haas-van Alphen (dHvA) measurements, x-ray photoemission and x-ray absorption spectroscopy measurements as well as x-ray magnetic circular dichroism. The effect of the spin-orbit (SO) interaction and Coulomb repulsion U were found to be crucial for the Fermi surface, cyclotron masses, magneto-optical properties, and x-ray magnetic circular dichroism. The microscopic origin of unique magneto-crystalline anisotropy and giant Kerr effect in MnBi is analyzed in detail. The huge Kerr effect in MnBi is caused by the combination of a sizable magnetic moment on manganese, the large spin-orbit coupling of bismuth, and a strong hybridization between the manganese 3d and the bismuth 6p states. The magneto-optically active states are mainly the 6p states of Bi. We show that the observed temperature dependence of the magneto-crystalline anisotropy can be explained taking into account the spin-orbit interaction together with strong Coulomb electron-electron interaction. The SO coupling of Bi is equally responsible for the large magneto-crystalline anisotropy energy as is the exchange splitting of Mn. The fabrication, morphology, and constitution of low-temperature MnBi alloys in bulk, thin films, and nanoparticles are discussed. The nanocomposite permanent magnetic materials based on MnBi, (Co, Fe) and Nd2Fe14B are also discussed.},
doi = {10.1063/10.0000360},
journal = {Low Temperature Physics},
number = [1],
volume = [46],
place = {United States},
year = {2020},
month = {1}
}

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