A room temperature polar magnetic metal

Zhang, Hongrui; Shao, Yu‐Tsun; Chen, Rui; Chen, Xiang; Susarla, Sandhya; Raftrey, David; Reichanadter, Jonathan; Caretta, Lucas; Huang, Xiaoxi; Settineri, Nicholas S.; Chen, Zhe; Zhou, Jingcheng; Bourret-Courchesne, Edith; Ercius, Peter; Yao, Jie; Fischer, Peter; Neaton, Jeffrey B.; Muller, David A.; Birgeneau, R. J.; Ramesh, R.

doi:10.1103/physrevmaterials.6.044403

Cited by 36 publications

(36 citation statements)

References 53 publications

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“…at ≈50%, the material becomes antiferromagnetic. We note that another work reports the realization of a polar ferromagnetic metal with 50% Co-substituted Fe5GeTe2 [31]. Difference between these two works may be due to minor differences in composition and the resulting structure.…”

Section: Characterization Of Bulk Cfgt Crystalmentioning

confidence: 86%

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Pervasive beyond Room-Temperature Ferromagnetism in a Doped van der Waals Magnet

et al. 2022

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Two-dimensional (2D) magnetic van der Waals materials provide a powerful platform for studying fundamental physics of low-dimensional magnetism, engineering novel magnetic phases, and enabling ultrathin and highly tunable spintronic devices. To realize high quality and practical devices for such applications, there is a critical need for robust 2D magnets with ordering temperatures above room temperature that can be created via exfoliation. Here the study of exfoliated flakes of cobalt substituted Fe5GeTe2 (CFGT) exhibiting magnetism above room temperature is reported. Via quantum magnetic imaging with nitrogen-vacancy centers in diamond, ferromagnetism at room temperature was observed in CFGT flakes as thin as 16 nm. This corresponds to one of the thinnest room-temperature 2D magnet flakes exfoliated from robust single crystals, reaching a thickness relevant to practical spintronic applications.The Curie temperature Tc of CFGT ranges from 310 K in the thinnest flake studied to 328 K in the bulk. To investigate the prospect of high-temperature monolayer ferromagnetism, Monte Carlo calculations were performed which predicted a high value of Tc ~270 K in CFGT monolayers. Pathways towards further enhancing monolayer Tc are discussed. These results support CFGT as a promising platform to realize high-quality room-temperature 2D magnet devices. IntroductionReceived: ((will be filled in by the editorial staff))Revised: ((will be filled in by the editorial staff))

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Section: Characterization Of Bulk Cfgt Crystalmentioning

confidence: 86%

“…Material reported in Ref. [31] also exhibits a high Tc ≈350 K, but magnetic properties were only examined in flakes with thickness >100 nm. In the present work, all CFGT corresponds to the 28% Co-substituted crystals as reported in Ref.…”

Section: Characterization Of Bulk Cfgt Crystalmentioning

confidence: 99%

Pervasive beyond Room-Temperature Ferromagnetism in a Doped van der Waals Magnet

et al. 2022

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“…However, skyrmion phases can only exist in Cr 2 Ge 2 Te 6 and Fe 3 GeTe 2 at temperatures considerably lower than room temperature, which greatly limits their practical applications. Recently, Zhang et al [ 171 ] reported a 2D polar ferromagnet, (Fe 0.5 Co 0.5 ) 5− x GeTe 2 , with a Curie temperature of ≈350 K. Notably, Néel‐type skyrmions were observed in this material at room temperature. [ 172 ] The findings on room‐temperature skyrmions in 2D magnets pave the way for skyrmion‐based 2D IMDs.…”

Section: Imds: Mechanisms Architectures and Applicationsmentioning

confidence: 97%

Integrated Memory Devices Based on 2D Materials

Xue

Zhang

et al. 2022

Advanced Materials

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With the advent of the Internet of Things and big data, massive data must be rapidly processed and stored within a short timeframe. This imposes stringent requirements on memory hardware implementation in terms of operation speed, energy consumption, and integration density. To fulfill these demands, 2D materials, which are excellent electronic building blocks, provide numerous possibilities for developing advanced memory device arrays with high performance, smart computing architectures, and desirable downscaling. Over the past few years, 2D‐material‐based memory‐device arrays with different working mechanisms, including defects, filaments, charges, ferroelectricity, and spins, have been increasingly developed. These arrays can be used to implement brain‐inspired computing or sensing with extraordinary performance, architectures, and functionalities. Here, recent research into integrated, state‐of‐the‐art memory devices made from 2D materials, as well as their implications for brain‐inspired computing are surveyed. The existing challenges at the array level are discussed, and the scope for future research is presented.

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“…An as-yet unexplored possibility for designing polar metals is to introduce magnetic spin spirals that break the inversion symmetry into metallic systems, analogous to the established spin-driven FE polarization in the prototypical type-II multiferroic, TbMnO 3 [84]. Although rare, several magnetic polar metals have already been reported [85][86][87][88]. Among these, interestingly, Fe-doped Ca 3 Ru 2 O 7 , Ca 3 (Ru 0.95 Fe 0.05 ) 2 O 7 , has an incommensurate spiral spin structure which resembles that of TbMnO 3 [85].…”

Section: Spin-spiral-driven Polar Metalsmentioning

confidence: 99%

“…While many interesting potentially useful properties of polar metals, such as, unconventional superconductivity [94], thermoelectricity [95,96], complex magnetism [85,88], multiferroicity [57], and nontrivial topology [97,98], have been realized, many proposed behaviors are yet to be uncovered. Here, we summarize some properties and potential applications that we find particularly promising for future investigation.…”

Section: Properties and Prospectsmentioning

confidence: 99%

Polar metals: Principles and Prospects

Bhowal¹,

Spaldin²

2022

Preprint

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We review the class of materials known as polar metals, in which polarity and metallicity coexist in the same phase. While the notion of polar metals was first invoked more than 50 years ago, their practical realization has proved challenging, since the itinerant carriers required for metallicity tend to screen any polarization. Huge progress has been made in the last decade, with many mechanisms for combining polarity and metallicity proposed, and the first examples, LiOsO 3 and WTe 2 , identified experimentally. The availability of polar metallic samples has opened a new paradigm in polar metal research, with implications in the fields of topology, ferroelectricity, magnetoelectricity, spintronics, and superconductivity. Here, we review the principles and techniques that have been developed to design and engineer polar metals and describe some of their interesting properties, with a focus on the most promising directions for future work.

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A room temperature polar magnetic metal

Cited by 36 publications

References 53 publications

Pervasive beyond Room-Temperature Ferromagnetism in a Doped van der Waals Magnet

Pervasive beyond Room-Temperature Ferromagnetism in a Doped van der Waals Magnet

Integrated Memory Devices Based on 2D Materials

Polar metals: Principles and Prospects

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