Giant g‐factor in Self‐Intercalated 2D TaS2

Central to the application of spintronic devices is the ability to manipulate spins by electric and magnetic fields, which relies on a large Landé g‐factor. The self‐intercalation of layered transitional metal dichalcogenides with native metal atoms can serve as a new strategy to enhance the g‐facto...

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Published in:Small (Weinheim an der Bergstrasse, Germany) Vol. 18; no. 38; pp. e2201975 - n/a
Main Authors: Wang, Ziying, Wang, Zishen, Zhou, Xin, Fu, Wei, Li, Haohan, Liu, Chaofei, Qiao, Jingsi, Quek, Su Ying, Su, Chenliang, Feng, Yuanping, Loh, Kian Ping
Format: Journal Article
Language:English
Published: Weinheim Wiley Subscription Services, Inc 01.09.2022
Subjects:
Charge transfer
Density of states
Electronic structure
Ferromagnetism
g‐factor
Intercalation
Interlayers
Magnetic fields
Nanotechnology
Scanning tunneling microscopy
self‐intercalation
strong correlation
TaS 2
ISSN:1613-6810, 1613-6829, 1613-6829
Online Access:Get full text
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Summary:Central to the application of spintronic devices is the ability to manipulate spins by electric and magnetic fields, which relies on a large Landé g‐factor. The self‐intercalation of layered transitional metal dichalcogenides with native metal atoms can serve as a new strategy to enhance the g‐factor by inducing ferromagnetic instability in the system via interlayer charge transfer. Here, scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS) are performed to extract the g‐factor and characterize the electronic structure of the self‐intercalated phase of 2H‐TaS2. In Ta7S12, a sharp density of states (DOS) peak due to the Ta intercalant appears at the Fermi level, which satisfies the Stoner criteria for spontaneous ferromagnetism, leading to spin split states. The DOS peak shows sensitivity to magnetic field up to 1.85 mV T−1, equivalent to an effective g‐factor of ≈77. This work establishes self‐intercalation as an approach for tuning the g‐factor. Central to the application of spintronics is the ability to manipulate spins by electric and magnetic fields, which relies on a large Landé g‐factor. Through scanning tunneling microscopy studies, the self‐intercalated phase of 2H‐TaS2 shows sensitivity to magnetic field up to 1.85 mV T−1, equivalent to an effective g‐factor of ≈77, which is 20‐folds larger than that of pristine 2H‐TaS2.
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ISSN:1613-6810
1613-6829
1613-6829
DOI:10.1002/smll.202201975