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Taichi Goto

Affiliation Department of Electrical and Electronic Information Engineering
Title Assistant Professor
Fields of Research Magnetics / Optics/ Photonics/ Nanotechnology/ Spintronics/ Magnonics
Degree Doctor of Eng. (Toyohashi University of Technology)
Academic Societies MSJ (Magnetics Society of Japan), IEEE (Institute of Electrical and Electronics Engineers), JSAP (The Japan Society of Applied Physics), IEEJ (The Institute of Electrical Engineers of Japan), APS (American Physical Society), MRS (Material Research Society
E-mail goto@ee
Please append ".tut.ac.jp" to the end of the address above.
Laboratory website URL http://taichigoto.boy.jp/wordpress/

Research

The magnetic devices by using nanotechnology, optics, rf engineering, electronics, biology, etc. have been developing. As the novel functional materials, the magneto-photonic crystal generating optical Tamm states and the composite films with nano iron wires etc have been fabricated. These materials can be used in applications like the magneto-optical modulators with the electro-optical effects controlled by voltage, the Q switch lasers, and the waveguide type optical isolators.

Theme1:Development of Magnonic Devices

Overview
Magnonic system using flow of spin wave

We are developing new processor based on “Magnonic” using spin wave (or magnon) which is similar to “Electronics” using electronic waves (or electron) for applications. Magnonics was proposed most recently, but the fundamental properties have not been revealed yet. Therefore we prepare our really high potential materials by ourselves, create a novel concept of the logic devices, and design the completely new processing system based on Magnonic. The spin wave do not transfer electron, do not flow current which means the propagating loss is zero in these magnonic devices. Such low loss processors should be applied to computer to show high ability like human brains.

Selected publications and works

■Shinsuke Shichi, Naoki Kanazawa, Kenji Matsuda, Shingo Okajima, Takashi Hasegawa, Takekazu Okada, Taichi Goto, Hiroyuki Takagi and Mitsuteru Inoue, "Spin wave isolator based on frequency displacement nonreciprocity in ferromagnetic bilayer", J. Appl. Phys., 117, 17, 17D125 (2015/03/20).
■Naoki Kanazawa, Taichi Goto, Jet Wei Hoong, Altansargai Buyandalai, Hiroyuki Takagi and Mitsuteru Inoue, "Metal thickness dependence on spin wave propagation in magnonic crystal using yttrium iron garnet", J. Appl. Phys., 117, 17, 17E510 (2015/04/06).
■Taichi Goto, Naoki Kanazawa, Altansargai Buyandalai, Hiroyuki Takagi, Yuichi Nakamura, Shingo Okajima, Takashi Hasegawa, Alexander B. Granovsky, Koji Sekiguchi, Caroline A. Ross and Mitsuteru Inoue, "Spin wave differential circuit for realization of thermally stable magnonic sensors", Appl. Phys. Lett., 106, 13, 132412 (2015/04/03).
■Naoki Kanazawa, Taichi Goto and Mitsuteru Inoue, "Spin wave localization in one-dimensional magnonic microcavity comprising yttrium iron garnet", J. Appl. Phys., 116, 8, 083903 (2014/08/25).

Keywords

Magnonics / Spin wave / Low loss / Brain

Theme2:Extremely sensitive magnetic filed sensors for detection of biomagnetic field

Overview
Sketch of biomagnetic sensor using magnonic crystal. Calculated and measured responses are also shown.

To investigate the functionalities of human’s body and brain directly or indirectly, the analysis of their activity is very important. We introduced the artificial structures into the magnetic materials to develop the extremely sensitive magnetic field sensors which can measure the small magnetic field excited by human’s heart/brain. The figure shows the high potential of our magnetic field sensors with soft magnetic oxides (yttrium iron garnet, YIG) which can be integrated with high density of sensors.

Selected publications and works

■Taichi Goto, Naoki Kanazawa, Altansargai Buyandalai, Hiroyuki Takagi, Yuichi Nakamura, Shingo Okajima, Takashi Hasegawa, Alexander B. Granovsky, Koji Sekiguchi, Caroline A. Ross and Mitsuteru Inoue, "Spin wave differential circuit for realization of thermally stable magnonic sensors", Appl. Phys. Lett., 106, 13, 132412 (2015/04/03).
■Naoki Kanazawa, Taichi Goto, Jet Wei Hoong, Altansargai Buyandalai, Hiroyuki Takagi and Mitsuteru Inoue, "Metal thickness dependence on spin wave propagation in magnonic crystal using yttrium iron garnet", J. Appl. Phys., 117, 17, 17E510 (2015/04/06).

Keywords

Magnonic crystal, Biomagnetic sensor, Spin wave device, Spin wave differential circuit

Theme3:Development of magnetooptical Q-switch laser using magnetic domain motion

Overview
A pulsed output with a power of dozens of watts and a pulse width of 40 ns was obtained through an MO Q-switched laser controlled by labyrinthshaped magnetic domains.

Taichi Goto and his colleagues have fabricated the first magneto-optical (MO) Q-switched laser. Unlike electro-optic (EO) and acousto-optic (AO) effects, MO effects had not previously been used in Q-switched lasers, although the effects themselves are very well-known. The fabricated MO Q-switched laser contributes to the development of compact high-power lasers.

Selected publications and works

Ryohei Morimoto, Taichi Goto, John Pritchard, Hiroyuki Takagi, Yuichi Nakamura, Pang Boey Lim, Hironaga Uchida, Mani Mina, Takunori Taira and Mitsuteru Inoue, “Magnetic domains driving a Q-switched laser”, Sci. Rep., 6, 38679 (2016/12/08).
Taichi Goto, Ryohei Morimoto, John W. Pritchard, Mani Mina, Hiroyuki Takagi, Yuichi Nakamura, Pang Boey Lim, Takunori Taira and Mitsuteru Inoue, “Magneto-optical Q-switching using magnetic garnet film with micromagnetic domains”, Opt. Express, 24, 17635-17643 (2016/08/08).

Keywords

Magnetooptics, Q-switch, laser, integrated Q-switch

Title of class

Experimental Practice for Electrical, Electronic and Information Engineering 2 (B12610120)
Basic Electromagnetism Exercise (B12510050)


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