Proximity effect of a two-dimensional van der Waals magnet Fe<sub>3</sub>GeTe<sub>2</sub> on nickel films

Qian, Chen; Liang, Jinxing; Fang, Bin; Zhu, Yonghui; Wang, Jiachen; Lv, Weiming; Lv, Wenxing; Cai, Jialin; Huang, Zhaocong; Zhai, Ya; Zhang, Baoshun; Zeng, Zhongming

doi:10.1039/d1nr03342e

Cited by 8 publications

(9 citation statements)

References 37 publications

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“…To obtain large-area FGT nanoflakes, we use the Al 2 O 3 -assisted exfoliation method . First, 6 nm-thick Al 2 O 3 films are deposited on the SiO 2 substrate by using the atomic layer deposition method.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…29 To obtain large-area FGT nanoflakes, we use the Al 2 O 3assisted exfoliation method. 28 First, 6 nm-thick Al 2 O 3 films are deposited on the SiO 2 substrate by using the atomic layer deposition method. Then, FGT is exfoliated using tape and transferred to the substrates with the Al 2 O 3 surface.…”

Section: ■ Experimental Methodsmentioning

confidence: 99%

“…27 While interfaced with 2D vdW magnets, the magnetism of magnetic films may be further modulated by interlayer exchange coupling in addition to the orbital hybridization. 28 However, effects of 2D vdW magnetic interfaces on magnetic films remain largely unexplored. Since 2D magnet FGT has a high Curie temperature just below the room temperature, contributions of both the orbital hybridization and interlayer exchange coupling to the adjacent magnetic film can be studied by controlling the temperature.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Several studies have been reported where an interface of 2D-vdW materials could benefit the formation of PMA for the magnetic film due to orbital hybridization, such as MoSe 2 . While interfaced with 2D vdW magnets, the magnetism of magnetic films may be further modulated by interlayer exchange coupling in addition to the orbital hybridization . However, effects of 2D vdW magnetic interfaces on magnetic films remain largely unexplored.…”

Section: Introductionmentioning

confidence: 99%

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Modulation of CoFeB Magnetism via Two-Dimensional van der Waals Fe₃GeTe₂

et al. 2022

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In recent years, two-dimensional van der Waals (2D-vdW) magnets have been widely employed in spintronic devices since they can be reduced to the monolayer while maintaining structural integrity. In this paper, an interfacial effect of the heterostructure including the Co 60 Fe 20 B 20 (CFB) layer and Fe 3 GeTe 2 (FGT) flake is explored. At the Curie temperature (T c ) of FGT, a reduction in the magnetization of the CFB/FGT bilayer is found compared to that of CFB itself unlike at 300 K. It is possible that non-parallel magnetic moments are formed at the interface due to the strong perpendicular magnetic anisotropy (PMA) of magnetic FGT below T c . Using a ferromagnetic resonance technique, we find that both PMA and the magnetic damping of CFB are enhanced by the FGT interface. Particularly, the PMA constant K ⊥ is increased by 20.2% at 300 K, much larger than that at 150 K, which indicates that the enhancement of PMA is induced by orbital hybridization at the interface instead of the magnetic proximity effect. The exchange interaction at the interface for moments between CFB and FGT may play a minor role in the enhancement of PMA of CFB induced by FGT. Also, such a less PMA enhancement at 150 K may be blocked by the magnetic interface of FGT below T c . This research highlights that the magnetism of CFB can be modulated by the interface of FGT even at room temperature, which provides a new approach for the application of 2D-vdW magnets in spintronics.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: ■ Experimental Methodsmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modulation of CoFeB Magnetism via Two-Dimensional van der Waals Fe₃GeTe₂

et al. 2022

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“…However, the insufficiency of a stable mass production technology and integrated intrinsic nature development is usually a huge obstacle that restricts the in-depth research and applications of emerging materials. Currently, the typical preparation methods of 2D FGT are mechanical exfoliation − ,− and molecular beam epitaxy. − For example, an FGT nanodevice was made by repeatedly exfoliating FGT crystals via Scotch tape and then carefully transferred to pretreated electrodes after attaching to a PDMS stamper . Liu et al obtained a 2D FGT film under a vacuum of 2.5 × 10 –9 Torr through a molecular beam epitaxy system equipped with a crystal oscillator and in situ reflection high energy electron diffraction system.…”

Section: Introductionmentioning

confidence: 99%

2D Magnetic Semiconductor Fe₃GeTe₂ with Few and Single Layers with a Greatly Enhanced Intrinsic Exchange Bias by Liquid-Phase Exfoliation

et al. 2022

ACS Nano

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A 2D van der Waals (vdW) magnet can get rid of the constraints of lattice matching and compatibility and then create a variety of vdW heterostructures, which provides a opportunity for spintronic devices. However, the ability to reliably exfoliate large, high-quality vdW ferromagnetic Fe 3 GeTe 2 (FGT) nanoflakes in scaled-up production is severely limited. Herein, an efficient and stable three-stage sonication-assisted liquid-phase exfoliation was developed for mass preparation of high-structural-integrity fewand single-layer FGT nanoflakes with a greatly enhanced intrinsic exchange bias. The three stages include slicing crystals, weakening interlayer vdW forces, and using ultrasonic cavitation. The highest yield of FGT nanoflakes is 22.3 wt % with single layers accounting for 6%. The size is controllable, and several micrometers, tens of micrometers, and a maximum of 103 μm are available. The 200 mg level output has overcome the limitations of mechanical exfoliation and molecular beam epitaxy in economically amplificated production. An intrinsic exchange bias is observed in the restacked nanoflakes due to the magnetic proximity on the interface of the FGT/natural surface oxide layer. The material reaches 578 Oe (2 K) and 2300 Oe after further oxidation, at least 250% higher than other precisely tailored vdW magnetic heterostructures. In addition, the unusual semiconductivity of the liquid-phase exfoliated FGT nanoflakes is reported. This work skillfully utilizes oxidation to enhance the potential of FGT for large-scale spintronics, optoelectronics, efficient data storage, and various extended applications, and it is beneficial for exfoliating other promising magnetic vdW materials.

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2D Magnetic Heterostructures and Emergent Spintronic Devices

Hao

Dai

Cai

et al. 2022

Adv Elect Materials

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The discovery of 2D intrinsic magnetic materials with ultrathin structures and smooth surfaces has enabled the investigation of fundamental magnetism physics and creation of spintronic devices. By vertically stacking 2D magnetic materials with other magnetic or nonmagnetic materials, various magnetic heterostructures and spintronic devices can be developed. Recent progress in emergent 2D magnetic heterostructures and spintronic devices is reviewed. First, various typical 2D magnetic materials and methods for constructing and characterizing magnetic heterostructures are briefly introduced. Then, magnetic heterostructures composed of magnetic/nonmagnetic and magnetic/magnetic materials are summarized, and recent advances in spintronic devices fabricated using magnetic heterostructures and the device performance are presented. Finally, an outlook for the future development of 2D magnetic heterostructures and spintronic devices is presented.

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Proximity effect of a two-dimensional van der Waals magnet Fe₃GeTe₂ on nickel films

Abstract: Recent advances in two-dimensional van der Waals (2D vdW) magnet provide new platforms to study the magnetism in reduced dimensions. However, most of the studies performed to date have been...

Cited by 8 publications

References 37 publications

Modulation of CoFeB Magnetism via Two-Dimensional van der Waals Fe₃GeTe₂

Modulation of CoFeB Magnetism via Two-Dimensional van der Waals Fe₃GeTe₂

2D Magnetic Semiconductor Fe₃GeTe₂ with Few and Single Layers with a Greatly Enhanced Intrinsic Exchange Bias by Liquid-Phase Exfoliation

2D Magnetic Heterostructures and Emergent Spintronic Devices

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Proximity effect of a two-dimensional van der Waals magnet Fe3GeTe2 on nickel films

Abstract: Recent advances in two-dimensional van der Waals (2D vdW) magnet provide new platforms to study the magnetism in reduced dimensions. However, most of the studies performed to date have been...

Cited by 8 publications

References 37 publications

Modulation of CoFeB Magnetism via Two-Dimensional van der Waals Fe3GeTe2

Modulation of CoFeB Magnetism via Two-Dimensional van der Waals Fe3GeTe2

2D Magnetic Semiconductor Fe3GeTe2 with Few and Single Layers with a Greatly Enhanced Intrinsic Exchange Bias by Liquid-Phase Exfoliation

2D Magnetic Heterostructures and Emergent Spintronic Devices

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Product

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Proximity effect of a two-dimensional van der Waals magnet Fe₃GeTe₂ on nickel films

Modulation of CoFeB Magnetism via Two-Dimensional van der Waals Fe₃GeTe₂

Modulation of CoFeB Magnetism via Two-Dimensional van der Waals Fe₃GeTe₂

2D Magnetic Semiconductor Fe₃GeTe₂ with Few and Single Layers with a Greatly Enhanced Intrinsic Exchange Bias by Liquid-Phase Exfoliation