Bilayer orthogonal ferromagnetism in CrTe${}_2$-based van der Waals system

Abstract

Systems with pronounced spin anisotropy play a pivotal role in advancing magnetization switching and spin-wave generation mechanisms, which are fundamental for spintronic technologies. Quasi-van der Waals ferromagnets, particularly Cr${}_{1+\delta }$Te${}_2$ compounds, represent seminal materials in this field, renowned for their delicate balance between frustrated layered geometries and magnetism. Despite extensive investigation, the precise nature of their magnetic ground state, typically described as a canted ferromagnet, remains contested, as does the mechanism governing spin reorientation under external magnetic fields and varying temperatures. In this work, we leverage a multimodal approach, integrating complementary techniques, to reveal that Cr${}_{1+\delta }$Te${}_2$ ($\delta =0.25-0.50$) hosts a previously overlooked magnetic phase, which we term orthogonal-ferromagnetism. This single phase consists of alternating atomically sharp single layers of in-plane and out-of-plane ferromagnetic blocks, coupled via exchange interactions and as such, it differs significantly from crossed magnetism, which can be achieved exclusively by stacking multiple heterostructural elements together. Contrary to earlier reports suggesting a gradual spin reorientation in CrTe${}_2$-based systems, we present definitive evidence of abrupt spin-flop-like transitions. This discovery, likely due to the improved crystallinity and lower defect density in our samples, repositions Cr${}_{1+\delta }$Te${}_2$ compounds as promising candidates for spintronic and orbitronic applications, opening new pathways for device engineering.

References in corpus (18)

• Hard magnetic properties in nanoflake van der Waals Fe3GeTe2
• GPAW: An open Python package for electronic-structure calculations
• In-plane magnetic domains and Néel-like domain walls in thin flakes of the room temperature CrTe${}_2$ van der Waals ferromagnet
• Flat band separation and robust spin-Berry curvature in bilayer kagome metals
• Designing in-plane heterostructures of quantum spin hall insulators from first principles: 1T'-MoS2 with adsorbates
• Tailoring Magnetism in Self-intercalated Cr1+δTe2 Epitaxial Films
• Magnetic anisotropy and entropy change in trigonal Cr${}_{0.62}$Te
• Characterization of room-temperature in-plane magnetization in thin flakes of CrTe${}_2$ with a single spin magnetometer
• Angular dependence of magnetization reversal in epitaxial chromium telluride thin films with perpendicular magnetic anisotropy
• Spin configurations in hard-soft coupled bilayer systems: from rigid magnet to exchange spring transitions
• Plane wave implementation of the magnetic force theorem for magnetic exchange constants: Application to bulk Fe, Co and Ni
• Discovery of a magnetic Dirac system with large intrinsic non-linear Hall effect
• Signatures of a surface spin-orbital chiral metal
• Disentangling structural and electronic properties in V${}_2$O${}_3$ thin films: a genuine non-symmetry breaking Mott transition
• Stability of the In-Plane Room Temperature van der Waals Ferromagnet Chromium Ditelluride and Its Conversion to Chromium-Interleaved CrTe${}_2$ Compounds
• Bilayer orthogonal ferromagnetism in CrTe${}_2$-based van der Waals system
• Uncovering the lowest thickness limit for room-temperature ferromagnetism of Cr${}_{1.6}$Te${}_2$
• The electronic structure of intertwined kagome, honeycomb, and triangular sublattices of the intermetallics MCo${}_2$Al${}_9$

Cited by in corpus (5)

• Bilayer orthogonal ferromagnetism in CrTe${}_2$-based van der Waals system
• Emergent Spin Fluctuation and Structural Metastability in Self-Intercalated Cr${}_{1+x}$Te${}_2$ Compounds
• Uncovering surface states of the Dirac semimetal BaMg2Bi2
• Many-body electronic structure, self-doped double-exchange, and Hund metallicity in 1T-CrTe2 bulk and monolayer
• Evidence for magnetoelastic coupling and chiral magnetic ground state in quasi-van der Waals tr-Cr${}_{1.22}$Te${}_2$