Quenching the Non-Collinear Spin Order in High-Tc Layered Ferromagnet Fe5GeTe2

Abstract

The realization of long-range spin order in two-dimensions (2D) has catapulted the search for layered materials with magnetic ordering above room temperature. These efforts aim to understand and enhance the spin spin interactions in 2D. An emergent class of such magnets is the layered FeNGeTe2 (N = 3, 4, and 5). Here, we investigate the magnetic states over a wide field temperature phase space in the high-Tc ferromagnet Fe5GeTe2 using magnetization, ferromagnetic resonance (FMR), and magneto-transport measurements. Our findings reveal a magnetic phase transition from a collinear to a complex non-collinear magnetic order near the temperature T* = 160 K, below which magnetic susceptibility is reduced, FMR linewidth broadened, and anomalous Hall resistivity suppressed. Such non-collinearity results from the competition between magnetocrystalline anisotropy and Dzyaloshinskii Moriya interaction arising from the unusual Fe1 ordering in two possible split sites. Our study focuses on the strategy to quench the non-collinear spin order. Substituting 40% Ni in Fe5GeTe2 is found to be one such quenching strategy. This provides deeper insights into the magnetism of a high-Tc layered-ferromagnet, offering opportunities to develop 2D magnet-based devices.

References in corpus (29)

• Layer-dependent Ferromagnetism in a van der Waals Crystal down to the Monolayer Limit
• Discovery of intrinsic ferromagnetism in 2D van der Waals crystals
• Gate-tunable Room-temperature Ferromagnetism in Two-dimensional Fe${}_3$GeTe${}_2$
• Two-Dimensional Itinerant Ising Ferromagnetism in Atomically thin Fe3GeTe2
• Giant anomalous Hall effect in a ferromagnetic Kagome-lattice semimetal
• Ising-Type Magnetic Ordering in Atomically Thin FePS3
• Massive Dirac fermions in a ferromagnetic kagome metal
• Magnetic structure and phase stability of the van der Waals bonded ferromagnet Fe3-xGeTe2
• Symmetry-Breaking Interlayer Dzyaloshinskii-Moriya Interactions in Synthetic Antiferromagnets
• Large anomalous Nernst effect in a van der Waals ferromagnet Fe${}_3$GeTe${}_2$
• Physical properties and thermal stability of Fe5GeTe2 single crystals
• Tuning Magnetic Order in the van der Waals Metal Fe5GeTe2 by Cobalt Substitution
• Breaking through the Mermin-Wagner limit in 2D van der Waals magnets
• Magnetic critical behavior of the van der Waals Fe5GeTe2 crystal with near room temperature ferromagnetism
• Planar topological Hall effect in a uniaxial van der Waals ferromagnet Fe3GeTe2
• Pervasive beyond room-temperature ferromagnetism in a doped van der Waals magnet: Ni doped Fe${}_5$GeTe${}_2$ with $T_{\text{C}}$ up to 478 K
• Magnetism and Spin Dynamics in Room-Temperature van der Waals Magnet Fe${}_5$GeTe${}_2$
• Skyrmionic Spin Structures in Layered Fe5GeTe2 Up To Room Temperature
• Six-fold crystalline anisotropic magnetoresistance in the (111) LaAlO${}_3$/SrTiO${}_3$ oxide interface
• Coexistence of Merons with Skyrmions in the Centrosymmetric van der Waals Ferromagnet Fe5GeTe2
• Effects of Fe deficiency and Co substitution in polycrystalline and single crystals of Fe${}_3$GeTe${}_2$
• Anomalous quasiparticles in the zone center electron pocket of the kagomé ferromagnet Fe3Sn2
• Observation of Skyrmions at Room Temperature in Co2FeAl Heusler Alloy Ultrathin Films
• (Fe${}_{1-x}$Ni${}_x$)${}_5$GeTe${}_2$: an antiferromagnetic triangular Ising lattice with itinerant magnetism
• Thermal cycling induced alteration of the stacking order and spin-flip in the room temperature van der Waals magnet Fe${}_5$GeTe${}_2$
• Design strong anomalous Hall effect via spin canting in antiferromagnetic nodal line materials
• Quantum critical Bose gas in the two-dimensional limit in the honeycomb antiferromagnet YbCl${}_3$ under magnetic fields
• Anisotropic magnetization dynamics in Fe5GeTe2 at room temperature
• Dzyaloshinskii-Moriya interaction in Fe5GeTe2 epitaxial thin films