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International Center for Materials Nanoarchitectonics (WPI-MANA)

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[[Research Highlights Vol.33] Innovative Transistors Based on Magnetically Induced Movement of Ions](https://mdr.nims.go.jp/datasets/519c0ddf-f98f-4e85-9b3c-571dbc19359a)

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2022/04/04 10:09 Innovative Transistors Based on Magnetically Induced Movement of Ions| MANAhttps://www.nims.go.jp/mana/research/highlights/vol33.html 1/2Previous  Index  NextResearch Highlights[Vol. 33]Innovative Transistors Based on Magnetically Induced Movement of Ions25 Dec, 2017Just as magnets attract iron particles in sandpits, permanent magnetics only attract onetype of ion in an electrochemical solution, constituting the basis of magneticallycontrolled electrochemical transistors.Electrochemical devices find application in many technologies, including batteries, capacitors,sensors, and transistors. For such electrochemical devices to operate, they need an electric fieldthat causes ionic transport and electrochemical processes. This simple but strict rule has longhindered innovation in electrochemistry and related technologies, however, WPI-MANA researchersrecently challenged the rule with their development of ‘magnetic control of electrochemicaldevices’.WPI-MANA researchers Takashi Tsuchiya and Kazuya Terabe and their co-workers used a smallmagnet, instead of electrical equipment, to drive ions. The transport of paramagnetic FeCl4 ions ina liquid electrolyte (including [Bmim]FeCl4) was magnetically controlled to operate a typicalelectrochemical device; an Electric Double Layer Transistor (EDLT), a type of transistor that usesan EDL at a semiconductor/electrolyte interface to tune the electronic carrier density of thesemiconductor. An electrical conductance of a two-dimensional hole gas (several nanometers thick)at a diamond (100) single crystal/electrolyte interface was successfully switched by a magneticfield, although the switching ratio was smaller than in conventional EDLTs that are controlled by anelectric field.https://www.nims.go.jp/mana/research/highlights/vol32.htmlhttps://www.nims.go.jp/mana/research/highlights/index.htmlhttps://www.nims.go.jp/mana/research/highlights/vol34.html2022/04/04 10:09 Innovative Transistors Based on Magnetically Induced Movement of Ions| MANAhttps://www.nims.go.jp/mana/research/highlights/vol33.html 2/2The magnetic control of ions adds a new dimension to the ‘nanoelectronics achieved by ions’paradigm, invented at WPI-MANA as the atomic switch*, and such control has a huge impact, evenon other electrochemical devices. It has the potential to realize innovative applications that havenot been possible using conventional approaches. Furthermore, this discovery stimulates thedevelopment of high performance magnetic electrolytes to support such innovation.In electrochemistry, a branch of chemistry that has already been studied intensively, theinterdisciplinary field with magnetism is one of the few great frontiers remaining. Researchers willbe undeniably attracted to it, like iron sand is to a magnet.* Reffers“Quantized Conductance Atomic Switch” K. Terabe, T. Hasegawa, T. Nakayama & M.Aono, Nature 433, 47-50 (2005)“Atomic Switch Reaching Outer Space” Research Highlights Vol. 31 (2017)Reference"Magnetic Control of Magneto-Electrochemical Cell and Electric Double Layer Transistor"Takashi Tsuchiya, Masataka Imura, Yasuo Koide and Kazuya TerabeJournal : Sci. Rep. 7, 10534 (2017).DOI : 10.1038/s41598-017-11114-2AffiliationsInternational Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for MaterialsScience (NIMS), Namiki 1-1, Tsukuba, Ibaraki 305-0044, JapanContact informationInternational Center for Materials Nanoarchitectonics(WPI-MANA)National Institute for Materials Science1-1 Namiki, Tsukuba, Ibaraki 305-0044 JapanPhone: +81-29-860-4710E-mail: mana-pr[AT]ml.nims.go.jphttps://samurai.nims.go.jp/profiles/tsuchiya_takashi?locale=enhttps://samurai.nims.go.jp/profiles/terabe_kazuya?locale=enhttps://www.nature.com/articles/s41598-017-11114-2