Antiferromagnetic order in Co-doped Fe${}_5$GeTe${}_2$ probed by resonant magnetic x-ray scattering

Abstract

The quasi-two-dimensional van der Waals magnet Fe${}_{5-\delta }$GeTe${}_2$ has emerged as a promising platform for electronic and spintronic functionalities at room temperature, owing to its large ferromagnetic ordering temperature $T_{\text{C}}$ $\sim$ 315 K. Interestingly, by cobalt (Co) substitution of iron in F5GT, $i.e.$ $({\text{Fe}}_{1-x}{\text{Co}}_x{)}_{5-\delta }{\text{GeTe}}_2$ (Co-F5GT), not only can its magnetic transition temperature be further enhanced, but the magnetic and structural ground states can also be tuned. Specifically, an antiferromagnetic (AFM) order is induced beyond the Co doping level $x\ge 0.4$. Here, we investigate the magnetic properties of a Co-F5GT single crystal at $x=0.45(1)$, by utilizing the element specific, resonant magnetic x-ray scattering technique. Our study reveals an A-type, Ising-like AFM ground state, with a transition temperature $T_{\text{N}}$ $\sim$ 340 K. In addition, our work unveils an important contribution from Co magnetic moments to the magnetic order. The application of the in-plane magnetic fields gradually polarize the spin moments along the field direction, but without inducing incommensurate spin texture(s).

7 pages with 5 figures. Submitted on June/2022

References in corpus (9)

• 2D materials and van der Waals heterostructures
• Magnetic 2D materials and heterostructures
• Van der Waals heterostructures for spintronics and opto-spintronics
• Engineering symmetry breaking in two-dimensional layered materials
• Resonant Elastic Soft X-Ray Scattering
• Tunable magnetic properties in van der Waals crystals (Fe${}_{1-x}$Co${}_x$)${}_5$GeTe${}_2$
• Tuning Magnetic Order in the van der Waals Metal Fe5GeTe2 by Cobalt Substitution
• 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
• Itinerant ferromagnetism mediated by giant spin polarization of metallic ligand band in van der Waals magnet Fe5GeTe2

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• Thermal cycling induced alteration of the stacking order and spin-flip in the room temperature van der Waals magnet Fe${}_5$GeTe${}_2$
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