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High Coercivity and Magnetization in WSe2 by Codoping Co and Nb.
Sohail Ahmed1, Xiang Ding1, Peter P Murmu2
1School of Materials Science and Engineering, UNSW, Sydney, NSW, 2052, Australia.
Small (Weinheim an Der Bergstrasse, Germany)
|August 24, 2019
Summary
Codoping tungsten diselenide (WSe2) with niobium (Nb) and cobalt (Co) significantly enhances ferromagnetism. This co-doping approach yields magnetization comparable to ferromagnets, opening new avenues for spintronics applications.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Introducing ferromagnetism in transition metal dichalcogenides is crucial for spintronics.
- Single magnetic element doping often results in weak ferromagnetism.
- Exploring co-doping strategies can potentially overcome limitations of single-element doping.
Purpose of the Study:
- To investigate the magnetic properties of WSe2 codoped with Nb and Co.
- To determine the effect of co-doping concentrations on magnetization and coercivity.
- To understand the mechanisms behind enhanced ferromagnetism in codoped WSe2.
Main Methods:
- Physical ion implantation to codope single crystal WSe2 with Co and Nb.
- Raman spectroscopy, X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) for doping verification.
- Magnetic measurements to quantify ferromagnetic properties and coercivity.
Main Results:
- Effective substitutional doping of Co and Nb confirmed by spectroscopy and diffraction.
- Co-doping with Nb and Co strongly enhances ferromagnetism in WSe2 compared to undoped or Co-doped samples.
- A large coercivity of ~1.2 kOe was observed in WSe2 codoped with 1 at% Nb and 4 at% Co.
Conclusions:
- Co-doping of WSe2 with Nb and Co is an effective method to achieve strong ferromagnetism.
- Enhanced magnetization is attributed to the combined effects of Co and Nb doping and induced defects.
- High coercivity is linked to doping-induced stress, defect pinning, and Nb-Se bond anisotropy.
Keywords:
2D materialsdiluted magnetic semiconductor (DMS)ion Implantationmagnetic propertiestransition metal dichalcogenides (TMDCs)More Related Videos
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