Mapping the phase-separated state in a 2D magnet

Mattiat, Hinrich; Schneider, Lukas; Reiser, Patrick; Poggio, Martino; Sahafi, Pardis; Jordan, Andrew; Budakian, Raffi; Averyanov, Dmitry V.; Sokolov, Ivan S.; Taldenkov, Alexander N.; Parfenov, Oleg E.; Kondratev, Oleg A.; Tokmachev, Andrey M.; Storchak, Vyacheslav G.

doi:10.1039/d3nr06550b

Cited by 2 publications

(1 citation statement)

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“…It is supported by XMCD measurements 62 and observation of exchange bias in GdSi 2 58 and EuSi 2 . 59 In a recent study, 63 the FM and AFM domains were imaged by magnetic force microscopy to provide direct evidence of the phase-separated state. It should be noted that the reduced magnetic moments are not a consequence of frustration in the triangular lattice of rare-earth ions�the situation is the same for other lattices as well.…”

Section: ■ Introductionmentioning

confidence: 99%

Engineering of a Layered Ferromagnet via Graphitization: An Overlooked Polymorph of GdAlSi

Averyanov,

Sokolov,

Taldenkov

et al. 2024

J. Am. Chem. Soc.

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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, in contrast to the nonlayered, 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.

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Section: ■ Introductionmentioning

confidence: 99%

Engineering of a Layered Ferromagnet via Graphitization: An Overlooked Polymorph of GdAlSi

Averyanov,

Sokolov,

Taldenkov

et al. 2024

J. Am. Chem. Soc.

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Emerging 2D Ferromagnetism in Graphenized GdAlSi

Averyanov,

Sokolov,

Taldenkov

et al. 2024

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Abstract2D magnets are expected to give new insights into the fundamentals of magnetism, host novel quantum phases, and foster development of ultra‐compact spintronics. However, the scarcity of 2D magnets often makes a bottleneck in the research efforts, prompting the search for new magnetic systems and synthetic routes. Here, an unconventional approach is adopted to the problem, graphenization – stabilization of layered honeycomb materials in the 2D limit. Tetragonal GdAlSi, stable in the bulk, in ultrathin films gives way to its layered counterpart – graphene‐like anionic AlSi layers coupled to Gd cations. A series of inch‐scale films of layered GdAlSi on silicon is synthesized, down to a single monolayer, by molecular beam epitaxy. Graphenization induces an easy‐plane ferromagnetic order in GdAlSi. The magnetism is controlled by low magnetic fields, revealing its 2D nature. Remarkably, it exhibits a non‐monotonic evolution with the number of monolayers. The results provide a fresh platform for research on 2D magnets by design.

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Mapping the phase-separated state in a 2D magnet

Abstract: Intrinsic 2D magnets have recently been established as a playground for studies on fundamentals of magnetism, quantum phases, and spintronic applications. The inherent instability at low dimensionality often results in...

Cited by 2 publications

References 71 publications

Engineering of a Layered Ferromagnet via Graphitization: An Overlooked Polymorph of GdAlSi

Engineering of a Layered Ferromagnet via Graphitization: An Overlooked Polymorph of GdAlSi

Emerging 2D Ferromagnetism in Graphenized GdAlSi

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