In:
Small, Wiley, Vol. 16, No. 12 ( 2020-03)
Abstract:
Introducing ferromagnetism in transition metal dichalcogenides has attracted lots of attention due to the possible applications in spintronics devices. Generally, single magnetic element doping is used to introduce magnetism. However, mostly, weak ferromagnetism is observed. In this work, codoping of two kinds of transition metals (Nb and Co) into WSe 2 is used to study its magnetic properties. In detail, single crystal WSe 2 is codoped with 4 at% Co and various concentrations of Nb by employing the physical ion implantation method. Raman, X‐ray diffraction and X‐ray photoelectron spectroscopy results reveal the effective substitutional doping of implanted elements (Co and Nb). Magnetic measurements illustrate that both un‐doped and 4 at% Co doped WSe 2 show weak ferromagnetism whereas magnetization is strongly enhanced when Co and Nb are codoped into WSe 2 . The magnetization is comparable with a ferromagnet, which may be attributed to Co, Nb doping and defects. In addition, a large coercivity of ≈1.2 kOe is observed in the 1 at% Nb–4 at% Co codoped WSe 2 sample, which may be ascribed to the combined effect of doping‐induced stress, defect‐dictated pinning and anisotropy of NbSe bond owing to the charge transfer between Nb and Se ions.
Type of Medium:
Online Resource
ISSN:
1613-6810
,
1613-6829
DOI:
10.1002/smll.201903173
Language:
English
Publisher:
Wiley
Publication Date:
2020
detail.hit.zdb_id:
2168935-0
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