Engineering of a Layered Ferromagnet via Graphitization: An Overlooked Polymorph of GdAlSi
arXiv:2403.03735 · doi:10.1021/jacs.4c01472
Abstract
Layered magnets are stand-out materials because of their range of functional properties that can be controlled by external stimuli. Regretfully, the class of such compounds is rather narrow, prompting the search for new members. Graphitization - stabilization of layered graphitic structures in the 2D limit - is being discussed for cubic materials. We suggest the phenomenon to extend beyond cubic structures; it can be employed as a viable route to a variety of layered materials. Here, the idea of graphitization is put into practice to produce a new layered magnet, GdAlSi. The honeycomb material, based on graphene-like layers AlSi, is studied both experimentally and theoretically. Epitaxial films of GdAlSi are synthesized on silicon; the critical thickness for the stability of the layered polymorph is around 20 monolayers. Notably, the layered polymorph of GdAlSi demonstrates ferromagnetism stemming from the open 4f-shells of Gd, in contrast to the non-layered, tetragonal polymorph. The ferromagnetism is further supported by electron transport measurements revealing negative magnetoresistance and the anomalous Hall effect. The results show that graphitization can be a powerful tool in the design of functional layered materials.
References in corpus (24)
- VASPKIT: A User-friendly Interface Facilitating High-throughput Computing and Analysis Using VASP Code
- Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
- Discovery of intrinsic ferromagnetism in 2D van der Waals crystals
- Magnetic-field-induced quantized anomalous Hall effect in intrinsic magnetic topological insulator MnBiTe
- Electric-field switching of two-dimensional van der Waals magnets
- Pressure-controlled interlayer magnetism in atomically thin CrI3
- Artificial graphene as a tunable Dirac material
- Ligand-field helical luminescence in a 2D ferromagnetic insulator
- Dirac surface states in intrinsic magnetic topological insulators EuSn2As2 and MnBi2nTe3n+1
- Magneto-optics in a van der Waals magnet tuned by self-hybridized polaritons
- Highly Anisotropic Excitons and Multiple Phonon Bound States in a Van der Waals Antiferromagnetic Insulator
- Physical origin of giant excitonic and magneto-optical responses in two-dimensional ferromagnetic insulators
- High mobility in a van der Waals layered antiferromagnetic metal
- The planar thermal Hall conductivity in the Kitaev magnet α-RuCl3
- Dynamic Magnetic Crossover at the Origin of the Hidden-Order in van der Waals Antiferromagnet CrSBr
- Superconductivity in the C32 Intermetallic Compounds AAl(2-x)Si(x), with A=Ca and Sr, and 0.6<x<1.2
- Magnetic crystalline-symmetry-protected axion electrodynamics and field-tunable unpinned Dirac cones in EuIn2As2
- In-plane antiferromagnetic moments in axion topological insulator candidate EuInAs
- Thermodynamic Properties and Pressure Effect on the Superconductivity in CaAlSi and SrAlSi
- Coexistence of Merons with Skyrmions in the Centrosymmetric van der Waals Ferromagnet Fe5GeTe2
- Spin Dynamics in van der Waals Magnetic Systems
- Controlled Ordering of Room-Temperature Magnetic Skyrmions in a Polar Van der Waals Magnet
- Spontaneous graphitization of ultrathin cubic structures: A computational study
- Topological magnetic phase transition in Eu-based A-type antiferromagnets