Spin-states in MoS2 thin-film transistors distinguished by operando electron spin resonance

We fabricate a novel molybdenum disulfide transistor and create an image of the spins of the electrons passing through which may open the way for new spintronic computers
Spin-states in MoS2 thin-film transistors distinguished by operando electron spin resonance

The collaboration of the University of Tsukuba (Tsukuba, Japan) and the Institute of High Pressure Physics (Warsaw, Poland) detected and mapped the electronic spins moving in a working transistor made of molybdenum disulfide. This research may lead to much faster computers that take advantage of the natural magnetism of electrons, as opposed to just their charge.


Spintronics is a new area of condensed matter physics that attempts to use the intrinsic magnetic moment of electrons, called “spins,” to perform calculations. This would be a major advance over all existing electronics that rely solely on the electron charge. However, it is difficult to detect these spins, and there are many unknowns regarding materials that can support the transport of spin-polarized electrons.


Now, an international research team led by the Division of Materials Science at the University of Tsukuba has successfully used electron spin resonance (ESR) to monitor the number and location of unpaired spins coursing through a molybdenum disulfide transistor. ESR uses the same physical principle as the MRI machines that create medical images. The spins are subject to a very strong magnetic field, which creates an energy difference between electrons with spins aligned and anti-aligned with the field. The absorbance of photons that match this energy gap can be measured to determine the presence of unpaired electron spins.


The experiment required the sample to be cooled to just four degrees above absolute zero, and the transistor to be in operation while the spins are being measured. The ESR signals were measured simultaneously with the drain and gate currents by the group of corresponding author Professor Kazuhiro Marumoto. The origins of the spins were further identified with the theoretical calculations by coauthor Professor Małgorzata Wierzbowska. Molybdenum disulfide was used because its atoms naturally form a nearly flat two-dimensional structure. The molybdenum atoms form a plane with a layer of sulfide ions above and below.


We found that charging the system with the additional electrons in a process called n-type doping was important for creating the spins. In contrast with previous work on other 2D materials, the n-type doping allowed us to achieve better control of the electronic spins. We believe that molybdenum disulfide will prove to be an important testbed for spintronic devices as the technology advances towards future consumer products. 

Figure: Schematic diagram of the MoS2 transistor in an ESR sample tube.

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