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The van der Waals magnet discovered in recent years is a low-dimensional spin-ordered system
.
This kind of system has received widespread attention because it may still have a magnetic sequence under the limit of two-dimensional ultrathin, and has high tunability and functional characteristics
The first threshold facing the application of magnons in the information field is to prepare the "on" and "off" states of magnons that are analogous to the switching effect of charge-based transistors
.
Due to the strong volatility of the magnon, it is relatively easy to inject and detect the magnon signal, but it is an unsolved international problem to completely turn off the magnon signal at the non-characteristic frequency through the gate electrode
Jianhao Chen’s research group has been studying low-dimensional quantum material device physics for a long time, and has completed a series of important research work with collaborators in the fields of low-dimensional high-mobility materials, low-dimensional topological materials and low-dimensional magnetic materials, such as the discovery of the potential of in-situ hydrogenated graphene Controlled spin-orbit coupling and ferromagnetic-antiferromagnetic coupling phase transition ( Physical Review B102, 045402 (2020); Physical Review B 104, 125422 (2021)), discovering the symmetry breaking of topological semimetals and nonlinear photoelectric effects ( Advanced Materials 30, 1,706,402 (2018); Nature Materials 18 is, 476 (2019)) and the like
.
Recently, Chen Jianhao’s research group discovered that the magnon transport process of low-dimensional magnets is highly adjustable, and it has cooperated with Academician Xie Xincheng of Peking University, researcher Ryuichi Shindo, Professor Xiao Jiang of Fudan University, and Associate Professor Liu Zheng of Nanyang Technological University.
In cooperation with Associate Professor Yu Peng of Sun Yat-Sen University, he established a two-dimensional magnon model and quantitatively analyzed the high nonlinearity in its transport process; using this nonlinearity, Chen Jianhao’s research group prepared a van der Waals antiferromagnetic The magnon valve of the insulator MnPS 3 (manganese phosphorous sulphur) realizes the completely reversible electric control of its second harmonic magnon signal, and demonstrates the diffusion type magnon logic NOT gate for the first time
.
Magnon logic is a new low-power digital circuit solution, which is expected to be a good supplement to the charge-based logic solution in the future
Figure 1.
MnPS 3 magnon valve structure diagram
A.
Atomic model of the crystal and spin structure of the antiferromagnetic insulator MnPS 3 ; B.
Atomic force micrograph of the MnPS3 magnon valve device, in which the injection end, the gate electrode and the detection end electrode are respectively dark green, red and blue Mark; C.
Schematic diagram of the generation, regulation and detection of magnons, the upper left part shows the device structure with external circuits and the direction of the in-plane magnetic field, and the lower right part shows the electrical regulation of the spin wave by the gate, I i n is the AC injection current, I gate is the DC gate control current, V 2ω is the second harmonic signal of the reverse spin Hall voltage, θ is the angle between the in-plane magnetic field and the x direction
Figure 2.
Electrical control of MnPS 3 magnon valve
A.
The relationship between V 2ω,0 and the DC gate current I gate at B = 9T and T = 2K; B.
The relationship between V 2ω and the external magnetic field angle θ under different I gates ; C.
Using I gate at 0 μA ( The MnPS 3 magnon valve can be repeatedly switched (magnon not gate) between "on" state) and 150μA ("off" state )
This work also predicted including but not limited CrI .
3 (chromium iodide), CrBr .
3 (chromic bromide), FePS .
3 (iron, phosphorus and sulfur), CRPS .
4 (chromium, phosphorus and sulfur) like a large class of van der Waals Both ferromagnetic and anti-ferromagnetic materials will exhibit a magnon valve control effect similar to that of MnPS 3
.
As a breakthrough in the field of low-dimensional spintronics, this result will have a significant impact on the fields of materials science, nanoelectronics and physics
On November 1, 2021, related research results were published online in Nature Communications with the title " Electrically switchable van der waals magnon valves" ( Electrically switchable van der waals magnon valves ); Peking University 2017 Grade-level doctoral students Chen Guangyi and Qi Shaomian are the co-first authors; Chen Jianhao is the corresponding author .
The above-mentioned research work has been supported by the National Key Research and Development Program "Quantum Control and Quantum Information" key special project, the National Natural Science Foundation of China, the Beijing Natural Science Foundation Outstanding Youth Science Fund, and the Chinese Academy of Sciences Strategic Leading Science and Technology Special Project
