Ultrathin high-temperature ferromagnetic rare-earth films: GdScGe and GdScSi monolayers

Wang, Rui; Hou, Li‐Peng; Shi, Puyuan; Cheng, Qianshuai; Zhang, Yungeng

doi:10.3389/fphy.2022.1128983

Cited by 3 publications

(2 citation statements)

References 55 publications

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“…Both systems are predicted to be metals. Various related magnetic compoundssilicides , and germanides of Eu and Gd, GdScSi, and GdScGeare metals. The metallic behavior of such Zintl phases is discussed in ref .…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…As the smallest cationic radius in the rare earth family, the Sc element and its compounds exhibit excellent physical and chemical properties. , The ScCl monolayer has intrinsic ferromagnetism with a high Curie temperature and excellent stabilities, and this monolayer shows a new type of Fermion dubbed type-II Weyl ring. − The ScCl 2 monolayer is a ferromagnetic semiconductor with high carrier mobilities . The ScCl 3 monolayer can be promising as a realistic 2D solid electrolyte .…”

Section: Introductionmentioning

confidence: 99%

Density Functional Theory Study of Layer-Controlled Band Gap and Strong Anisotropic Properties in ScSI Nanosheet: Implications for Photoelectric Sensor

Hou,

Dong,

Shi

et al. 2023

ACS Appl. Nano Mater.

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Moderate band gap and high stabilities are key properties in (opto)electronic devices application. Based on first-principles calculations, we predicted an ultrathin two-dimensional (2D) semiconductor, namely, a ScSI nanosheet, with tunable electronic properties and high stabilities. The ScSI monolayer is an indirect semiconductor with a band gap of 2.59 eV, and significantly, this monolayer can shift from an indirect to direct band gap under small strains. Moreover, the cleavage energy of the ScSI monolayer is lower than that of graphene, and this monolayer possesses high dynamical, thermal, and mechanical stabilities, suggesting the possibility of mechanical exfoliation experimentally. Interestingly, due to the quantum confinement effect, the band gaps of the ScSI nanosheets exhibit a layer-dependent exponential decay relationship with an increasing number of layers. The exceptional properties render ScSI nanosheets a promising candidate for flexible applications in optoelectronic devices especially in photoelectric sensors.

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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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Ultrathin high-temperature ferromagnetic rare-earth films: GdScGe and GdScSi monolayers

Cited by 3 publications

References 55 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

Density Functional Theory Study of Layer-Controlled Band Gap and Strong Anisotropic Properties in ScSI Nanosheet: Implications for Photoelectric Sensor

Emerging 2D Ferromagnetism in Graphenized GdAlSi

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