Disordered 2D ferromagnetism at the surface of FeSi

Abstract

FeSi is a curious example of a $d$-electron system that manifests many of the same phenomena associated with $f$-electron Kondo insulators, including conducting surface states with potentially non-trivial topology. Here we investigate the magnetization and magnetotransport of these surface states and how a 2D ferromagnetic state at the surface of FeSi influences the surface conductivity. We confirm the 2D ferromagnetism via a systematic study of magnetization on groups of filtered fragments with increasing surface area-to-volume ratios, identifying characteristic temperatures and magnetic fields associated with the ordered state. The paramagnetic to ferromagnetic transition appears broadened, suggesting disorder, which allows spin fluctuations to manifest up to at least 9 T at 2 K. This highlights the need to understand the relation between the disorder of the 2D ferromagnetism and the surface conductivity in FeSi.

8 pages, 5 figures

References in corpus (35)

• Topological insulators and superconductors
• Discovery of intrinsic ferromagnetism in 2D van der Waals crystals
• Anomalous Hall effect
• Skyrmion Lattice in a Doped Semiconductor
• Tunable Kondo Effect in Graphene with Defects
• Metallic Quantum Ferromagnets
• Robust Surface Hall Effect and Nonlocal Transport in SmB6: Indication for an Ideal Topological Insulator
• Unconventional Fermi surface in an insulating state
• Large Anomalous Hall effect in a silicon-based magnetic semiconductor
• Hybridization, Inter-Ion Correlation, and Surface States in the Kondo Insulator SmB6
• Polarity-driven surface metallicity in SmB${}_6$
• Fermi surface in the absence of a Fermi liquid in the Kondo insulator SmB${}_6$
• Kondo Breakdown in Topological Kondo Insulators
• One-dimensional edge state transport in a topological Kondo insulator
• Thermoelectricity in correlated narrow-gap semiconductors
• The so-called two dimensional metal-insulator transition
• History dependence of the magnetic properties of single-crystal Fe${}_{1-x}$Co${}_x$Si
• Metal-insulator transition and magnetism in correlated band insulator: FeSi and Fe${}_{1-x}$Co${}_x$Si
• Weak localization correction to the anomalous Hall effect in polycrystalline Fe films
• Electrical and magnetic transport properties of Fe3O4 thin films on GaAs (100) substrate
• The 2D metal-insulator transition as a strong localization induced crossover phenomenon
• Electronic Structure Studies of FeSi: A Chiral Topological System
• Quantum corrections to the conductivity and Hall coefficient of a 2D electron gas in a dirty AlGaAs/GaAs/AlGaAs quantum well: transition from diffusive to ballistic regime
• Quantum corrections to the conductivity and Hall coefficient of a two-dimensional electron gas in a dirty AlGaAs/GaAs/AlGaAs quantum well: from the diffusive to the ballistic regime
• Magnetic field-tuned quantum criticality in a Kondo insulator
• Smectic to nematic transition of magnetic texture in conical state
• Conductivity of two-dimensional narrow gap semiconductors subjected to strong Coulomb disorder
• $f$-electron hybridised metallic Fermi surface in magnetic field-induced metallic YbB${}_{12}$
• Probing FeSi, a d-electron topological Kondo insulator candidate, with magnetic field, pressure, and microwaves
• Structural and magnetic properties of E-Fe_{1-x}Co_xSi thin films deposited via pulsed laser deposition
• Bulk transport paths through defects in floating zone and Al flux grown SmB${}_6$
• Extraordinary Bulk Insulating Behavior in the Strongly Correlated Materials FeSi and FeSb${}_2$
• Conductivity of two-dimensional small gap semiconductors and topological insulators in strong Coulomb disorder
• Quantum corrections to conductivity of disordered electrons due to inelastic scattering off magnetic impurities
• A combined inelastic neutron scattering and \textit{ab initio} lattice dynamics study of FeSi

Cited by in corpus (1)

• Cubic magnetic anisotropy in $B$20 magnets: Interplay of anisotropy and magnetic order in Fe${}_{1-x}$Co${}_x$Si