Abstract
In this contribution to the MDPI Condensed Matter issue in Honor of Nobel Laureate Professor K.A. Müller I review recent experimental progress on magnetism of semiconducting transition metal dichalcogenides (TMDs) from the local-magnetic probe point of view such as muon-spin rotation and discuss prospects for the creation of unique new device concepts with these materials. TMDs are the prominent class of layered materials, that exhibit a vast range of interesting properties including unconventional semiconducting, optical, and transport behavior originating from valley splitting. Until recently, this family has been missing one crucial member: magnetic semiconductor. The situation has changed over the past few years with the discovery of layered semiconducting magnetic crystals, for example CrI 3 and VI 2 . We have also very recently discovered unconventional magnetism in semiconducting Mo-based TMD systems 2H-MoTe 2 and 2H-MoSe 2 [Guguchia et. al., Science Advances 2018, 4(12)]. Moreover, we also show the evidence for the involvement of magnetism in semiconducting tungsten diselenide 2H-WSe 2 . These results open a path to studying the interplay of 2D physics, semiconducting properties and magnetism in TMDs. It also opens up a host of new opportunities to obtain tunable magnetic semiconductors, forming the basis for spintronics.
Highlights
Spintronics, or spin-based electronics, is one of the promising generation information technology [1,2]
The exact link between μSR and STM/DFT results [9] in 2H-MoTe2 and 2H-MoSe2 is not yet clear, both results together constitute a first strong evidence concerning the relevance of magnetic order in the transition metal dichalcogenides (TMDs) physics
Ferromagnetism is observed in VSe2 monolayers
Summary
Spintronics, or spin-based electronics, is one of the promising generation information technology [1,2]. Combining a wealth of different technique, in particular the muon-spin rotation/relaxation (μSR) technique, we discovered novel magnetism in these very stable semiconducting materials: molybdenum diteluride (MoTe2) and molybdenum diselenide (MoSe2) [9].
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