Above Room-Temperature Ferromagnetism in Wafer-Scale Two-Dimensional van der Waals Fe3GeTe2 Tailored by a Topological Insulator

ACS Nano ◽  
2020 ◽  
Vol 14 (8) ◽  
pp. 10045-10053 ◽  
Author(s):  
Haiyu Wang ◽  
Yingjie Liu ◽  
Peichen Wu ◽  
Wenjie Hou ◽  
Yuhao Jiang ◽  
...  
Keyword(s):  
Topological Insulator ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Van Der Waals ◽  
Two Dimensional ◽  
Wafer Scale

scholarly journals Tunable room-temperature ferromagnetism in Co-doped two-dimensional van der Waals ZnO

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Rui Chen ◽  
Fuchuan Luo ◽  
Yuzi Liu ◽  
Yu Song ◽  
Yu Dong ◽  
...  
Keyword(s):  
Room Temperature ◽  
Spontaneous Magnetization ◽  
Magnetic Circular Dichroism ◽  
Room Temperature Ferromagnetism ◽  
Van Der Waals ◽  
Single Atom ◽  
Spin Interaction ◽  
Two Dimensional ◽  
X Ray ◽  
Co Doped

AbstractThe recent discovery of ferromagnetism in two-dimensional van der Waals crystals has provoked a surge of interest in the exploration of fundamental spin interaction in reduced dimensions. However, existing material candidates have several limitations, notably lacking intrinsic room-temperature ferromagnetic order and air stability. Here, motivated by the anomalously high Curie temperature observed in bulk diluted magnetic oxides, we demonstrate room-temperature ferromagnetism in Co-doped graphene-like Zinc Oxide, a chemically stable layered material in air, down to single atom thickness. Through the magneto-optic Kerr effect, superconducting quantum interference device and X-ray magnetic circular dichroism measurements, we observe clear evidences of spontaneous magnetization in such exotic material systems at room temperature and above. Transmission electron microscopy and atomic force microscopy results explicitly exclude the existence of metallic Co or cobalt oxides clusters. X-ray characterizations reveal that the substitutional Co atoms form Co2+ states in the graphitic lattice of ZnO. By varying the Co doping level, we observe transitions between paramagnetic, ferromagnetic and less ordered phases due to the interplay between impurity-band-exchange and super-exchange interactions. Our discovery opens another path to 2D ferromagnetism at room temperature with the advantage of exceptional tunability and robustness.

Room-temperature Ferromagnetism in Two-dimensional Transition Metal Borides: A First-principles Investigation

2021 ◽  
Author(s):  
Fang Wu ◽  
Min Dou ◽  
Huan Li ◽  
Yunfei Liu ◽  
Qingnian Yao ◽  
...  
Keyword(s):  
Transition Metal ◽  
First Principles ◽  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Ferromagnetic Materials ◽  
Information Storage ◽  
Two Dimensional ◽  
Storage Media ◽  
Metal Borides ◽  
Generation Information

It is important to predict new two-dimensional (2D) ferromagnetic materials for next-generation information storage media. However, discovered 2D ferromagnetic materials are still rare. Here, we explored that 2D transition metal...

Fabrication and magnetic-electronic properties of van der Waals Cr4Te5 ferromagnetic film

CrystEngComm ◽  
2021 ◽  
Author(s):  
Weiyuan Wang ◽  
Jiyu Fan ◽  
Hao Liu ◽  
Huan Zheng ◽  
Chuanlan Ma ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Room Temperature ◽  
Van Der Waals ◽  
Ferromagnetic Film ◽  
Ferromagnetic Materials ◽  
Two Dimensional ◽  
Actual Number ◽  
Intrinsic Ferromagnetism

Exploiting two-dimensional room temperature ferromagnetic materials is always a significant and valuable work. However, the actual number of satisfied materials with intrinsic ferromagnetism is very limited. Here, the van der...

scholarly journals Strong intrinsic room-temperature ferromagnetism in freestanding non-van der Waals ultrathin 2D crystals

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Hao Wu ◽  
Wenfeng Zhang ◽  
Li Yang ◽  
Jun Wang ◽  
Jie Li ◽  
...  
Keyword(s):  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Van Der Waals ◽  
Ambient Air ◽  
Critical Importance ◽  
Functional Possibility ◽  
Topological Quantum ◽  
Unit Cells ◽  
Optical And Mechanical Properties ◽  
2D Crystals

AbstractControl of ferromagnetism is of critical importance for a variety of proposed spintronic and topological quantum technologies. Inducing long-range ferromagnetic order in ultrathin 2D crystals will provide more functional possibility to combine their unique electronic, optical and mechanical properties to develop new multifunctional coupled applications. Recently discovered intrinsic 2D ferromagnetic crystals such as Cr2Ge2Te6, CrI3 and Fe3GeTe2 are intrinsically ferromagnetic only below room temperature, mostly far below room temperature (Curie temperature, ~20–207 K). Here we develop a scalable method to prepare freestanding non-van der Waals ultrathin 2D crystals down to mono- and few unit cells (UC) and report unexpected strong, intrinsic, ambient-air-robust, room-temperature ferromagnetism with TC up to ~367 K in freestanding non-van der Waals 2D CrTe crystals. Freestanding 2D CrTe crystals show comparable or better ferromagnetic properties to widely-used Fe, Co, Ni and BaFe12O19, promising as new platforms for room-temperature intrinsically-ferromagnetic 2D crystals and integrated 2D devices.

Strong room-temperature ferromagnetism in VSe2 monolayers on van der Waals substrates

2018 ◽  
Vol 13 (4) ◽  
pp. 289-293 ◽  
Author(s):  
Manuel Bonilla ◽  
Sadhu Kolekar ◽  
Yujing Ma ◽  
Horacio Coy Diaz ◽  
Vijaysankar Kalappattil ◽  
...  
Keyword(s):  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Van Der Waals

scholarly journals Room temperature ferromagnetism in ultra-thin van der Waals crystals of 1T-CrTe2

Nano Research ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3358-3363 ◽  
Author(s):  
Xingdan Sun ◽  
Wanying Li ◽  
Xiao Wang ◽  
Qi Sui ◽  
Tongyao Zhang ◽  
...  
Keyword(s):  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Van Der Waals

scholarly journals Nearly Room-Temperature Ferromagnetism in a Pressure-Induced Correlated Metallic State of the van der Waals Insulator CrGeTe3

2021 ◽  
Vol 127 (21) ◽  
Author(s):  
Dilip Bhoi ◽  
Jun Gouchi ◽  
Naoka Hiraoka ◽  
Yufeng Zhang ◽  
Norio Ogita ◽  
...  
Keyword(s):  
Room Temperature ◽  
Room Temperature Ferromagnetism ◽  
Van Der Waals ◽  
Metallic State

Massive Vacancy Concentration Yields Strong Room-Temperature Ferromagnetism in Two-Dimensional ZnO

Nano Letters ◽  
2019 ◽  
Vol 19 (10) ◽  
pp. 7085-7092 ◽  
Author(s):  
Xin Yin ◽  
Yizhan Wang ◽  
Ryan Jacobs ◽  
Yeqi Shi ◽  
Izabela Szlufarska ◽  
...  
Keyword(s):  
Room Temperature ◽  
Vacancy Concentration ◽  
Room Temperature Ferromagnetism ◽  
Two Dimensional
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