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博士(工学)(慶應義塾大学)
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修士(工学)(慶應義塾大学)
研究者詳細
経歴 6
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2025年6月 ~ 継続中東北大学 国際集積エレクトロニクス研究開発センター 研究開発部門 教授
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2019年9月 ~ 2025年2月サムソン電子株式会社 半導体研究所 首席研究官
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2017年 ~ 2019年7月東芝メモリ株式会社 メモリ技術研究所 主幹
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2000年9月 ~ 2017年株式会社 東芝 研究開発センター 研究主幹
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1998年8月 ~ 2000年7月University of Alabama MINT Center Post Doctoral researcher
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1997年4月 ~ 1998年3月慶應義塾大学 理工学部 助手
学歴 2
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慶應義塾大学 理工学研究科 計測工学専攻
1992年4月 ~ 1997年3月
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慶應義塾大学 理工学部 計測工学科
1988年4月 ~ 1992年3月
委員歴 1
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日本磁気学会 編集委員、論文委員、広報委員
2001年 ~ 2010年
研究キーワード 1
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スピントロニクス
研究分野 1
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ナノテク・材料 / ナノ材料科学 / スピントロニクス、固体物性、電子状態、計算物理
論文 33
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World-most energy-efficient MRAM technology for non-volatile RAM applications 査読有り
T. Y. Lee, J. M. Lee, M. K. Kim, J. S. Oh, J. W. Lee, H. M. Jeong, P. H. Jang, M. K. Joo, K. Suh, S. H. Han, D. -E. Jeong, T. Kai, J. H. Jeong, J. -H. Park, J. H. Lee, Y. H. Park, E. B. Chang, Y. K. Park, H. J. Shin, Y. S. Ji, S. H. Hwang, K. T. Nam, B. S. Kwon, M. K. Cho, B. Y. seo, Y. J. Song, G. H. Koh, K. Lee, J. -H. Lee, G. T. Jeong
2022 International Electron Device Meeting (IEDM2022) 2022年
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28nm CIS-Compatible Embeded STT-MRAM for Frame Buffer Memory 査読有り
K. Lee, D. S. Kim, J. H. Bak, S. P. Ko, W. C. Lim, H. C. Shin, J. H. Lee, J. H. Park, J. H. Jeong, J. M. Lee, T. Kai, H. Sato, J. W. Lee, K. H. Ryu, Y. J. Kim, S. H. Han, B. Y. Seo, K. S. Suh, H. H. Kim, H. T. Jung, D. H. Jang, N. Y. Ji, M. J. Eom, I. H. Kim, K. Lee, K. H. Hwang, Y. J. Song, H. S. Kim
2021 International Electron Device Meeting (IEDM2021) 2021年
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Ab initio calculation of interlayer exchange coupling in Co-based synthetic antiferromagnetic with alloy spacer 査読有り
R. Takashima, T. Tsukagoshi, T. Ishihara, T. Kai
AIP Advance 10 015324 2020年
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Effect of reference layer magnetic properties on storage layer switching properties with STT-MRAM 査読有り
S. Itai, T. Kai, J. Ozeki, M. Nakayama, J. Ito, T. Ishihara
2019 Joint MMM- Intermag Conference 2019年
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High efficient spin transfer torque writing on perpendicular magnetic tunnel junctions for high density MRAMs 査読有り
H. Yoda, T. Kishi, T. Nagase, M. Yoshikawa, K. Nishiyama, E. Kitagawa, T. Daibou, M. Amano, N. Shimomura, S. Takahashi, T. Kai, M. Nakayama, H. Aikawa, S. Ikegawa, M. Nagamine, J., Ozeki, S. Mizukami, M. Oogane, Y. Ando, S. Yuasa, K. Yakushiji, H. Kubota, Y. Suzuki, Y., Nakatani, T. Miyazaki, K. Ando
Current Appl. Phys. 10 e87 2010年
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Reduction of switching current distribution in spin transfer magnetic random access memories 査読有り
M. Iwayama, T. Kai, M. Nakayama, H. Aikawa, Y. Asao, T. Kajiyama, S. Ikegawa, H. Yoda, A. Nitayama
Journal of Applied Physics 103 07A720 2008年
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Spin transfer switching in TbCoFe/CoFeB/MgO/CoFeB/TbCoFe magnetic tunnel junctions with perpendicular magnetic anisotropy 査読有り
M. Nakayama, T. Kai, N. Shimomura, M. Amano, E. Kitagawa, T. Nagase, M. Yoshikawa, T. Kishi, S. Ikegawa, H. Yoda
J. Appl. Phys. 103 07A710 2008年
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Estimation of spin transfer torque effect and thermal activation effect on magnetization reversal in CoFeB∕MgO∕CoFeB 査読有り
M. Yoshikawa, E. Kitagawa, S. Takahashi, T. Kai, M. Amano, N. Shimomura, T. Kishi, S., Ikegawa, Y. Asao, H. Yoda, K. Nagahara, H. Numata, N. Ishiwata, H. Hada, S. Tahara
Journal of Applied Physics 99 08R702 2007年
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Reduction of switching field distributions by edge oxidization of submicron magnetoresistive tunneling junction cells for high-density magnetoresistive random access memories 査読有り
M. Yoshikawa, E. Kitagawa, S. Takahashi, T. Kai, M. Amano, N. Shimomura, T. Kishi, S., Ikegawa, Y. Asao, H. Yoda, K. Nagahara, H. Numata, N. Ishiwata, H. Hada, S. Tahara
Journal of Applied Physics 99 08R702 2006年
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Ion-beam-etched profile control of MTJ cells for improving the switching characteristics of high-density MRAM 査読有り
S. Takahashi, T. Kai, N. Shimomura, T. Ueda, M. Amano, M. Yoshikawa, E. Kitagawa, Y. Asao, S. Ikegawa, T. Kishi, H. Yoda, K. Nagahara, T. Mukai, H. Hada
IEEE Transactions on Magnetics, 42 2745 2006年
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1.8 V power supply 16Mb-MRAMs with 42.3% array efficiency 査読有り
H. Yoda, T. Kai, T. Inaba, Y. Iwata, N. Shimomura, S. Ikegawa, K. Tsuchida, Y. Asao, T. Kishi, T. Ueda, S. Takahashi, M. Nagamine, T. Kajiyama, M. Yoshikawa, M. Amano, T. Nagase, K. Hosotani, M. Nakayama, Y. Shimizu, H. Aikawa, K. Nishiyama, E. Kitagawa, R. Takizawa, Y. Ueda, M. Iwayama, K. Itagaki
IEEE Transactions on Magnetics, 42 2724 2006年
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Disturb robust switching astroid curve od C-shape cell with weakly coupled synthetic antiferromagnetic layer 査読有り
M. Nakayama, T. Kai, S. Ikegawa, H. Yoda, T. Kishi, E. Kitagawa, T. Nagase, M. Yoshikawa, Y. Asao, K. Tsuchida
IEEE Transactions on Magnetics, 42 2733 2006年
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Switching current fluctuation and repeatability for MRAM with propeller-shape MTJ 査読有り
N. Shimomura, H. Yoda, S. Ikegawa, T. Kai, M. Amano, T. Ueda, M. Nakayama, Y. Asao, K. Hosotani, Y. Shimizu, K. Tsuchida
IEEE Transactions on Magnetics, 42 2757 2006年
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A concept of exchange-coupled recording medium for heat-assisted magnetic recording 査読有り
A. Kikitsu, T. Kai, T. Nagase, J. Akiyama
Journal of Applied Physics 97 10P701 2005年
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Bit yield improvement by precise control of stray fields from SAF pinned layers for high-density MRAMs 査読有り
M. Yoshikawa, T. Kai, M. Amano, E. Kitagawa, T. Nagase, M. Nakayama, S. Takahashi, T. Ueda, T. Kishi, K. Tsuchida, S. Ikegawa, Y. Asao, H. Yoda, Y. Fukuzumi, K. Nagahara, H. Numata, H. Hada, N. Ishiwata, S. Tahara
Journal of Applied Physics 97 10P508 2005年
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Magnetic and electronic structures of FePtCu ternary ordered alloy 査読有り
T. Kai, T. Maeda, A. Kikitsu, J. Akiyama, T. Nagase, T. Kishi
Journal of Applied Physics 95 609 2004年
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Reduction of ordering temperature of an FePt-ordered alloy by addition of Cu 査読有り
T. Maeda, T. Kai, A. Kikitsu, T. Nagase, J. Akiyama
Appl. Phys. Lett. 80 2147 2002年
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Effect of direct exchange coupling between antiferromagnetic grains on magnetic behavior of ferro/antiferromagnetic exchange coupled polycrystalline layer systems 査読有り
H. Fujiwara, K. Zhang, T. Kai, T. Zhao
Journal of Magnetism and Magnetic Materials 235 319 2001年
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Rotational hysteresis of torque curves in polycrystalline ferro/antiferromagnetic systems 査読有り
K. Zhang, T. Kai, T. Zhao, H. Fujiwara, C. Hou, M. T. Kief
Journal of Applied Physics 89 7546 2001年
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Biquadratic coupling effect on magnetoresistance response curves of spin valves with a synthetic antiferromagnet
K. Zhang, T. Kai, T. Zhao, H. Fujiwara, G. J. Mankey
Journal of Applied Physics 89 6814 2001年
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First principles study of direct exchange coupling between the grains in NiMn antiferromagnets 査読有り
T. Kai, H. Fujiwara, T. C. Schulthess, W. H. Butler
Journal of Applied Physics 89 7940 2001年
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First-principle band calculation of ruthenium for various phases 査読有り
S. Watanabe, T. Komine, T. Kai, K. Shiiki
Journal of Magnetism and Magnetic Materials 220 277 2000年
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Interlayer exchange coupling and electronic structure of Co/Mn multilayers 査読有り
T. Kai
Journal of Magnetism and Magnetic Materials 214 167 2000年
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Influence of spin-dependent scattering at rough interface on the giant magnetoresistance in magnetic multilayers 査読有り
T. Kai, K. Shiiki
Journal of Magnetism and Magnetic Materials 195 537 1999年
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Study of Giant MagnetoResistance in Co/X superlattices (X=Cu, Ru, Rh and Pd) by first principle band calculation 査読有り
T. Kai, Y. Ohashi, K. Shiiki
Journal of Magnetism and Magnetic Materials 183 292 1998年
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Effect of 4d-transition metal on the electronic structure and magnetic properties of a-Fe 査読有り
T. Kai, M. Nakamura, N. Takano, Y. Ohashi, K. Shiiki
J. Phys.: Condens. Mater. 10 371 1998年
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Electronic Structure and Giant MagnetoResistance of Co/X Superlattices 査読有り
T. Kai, K. Shiiki
J. Magn. Soc. Jpn. 22 529 1998年
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Effect of Nb addition to Ni and Fe on electronic structure and magnetic properties 査読有り
M. Kobayashi, T. Kai, N. Takano, Y. Ohashi, K. Shiiki
Journal of Magnetism and Magnetic Materials 166 329 1997年
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EFFECT OF COPICIOUS VACANCIES ON MAGNETISM OF Pd 査読有り
N. Takano, T. Kai, K. Shiiki, F. Terasaki
Solid State Communications 97 153 1996年
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Effect of Ru addition to Ni on electronic structure and magnetic property 査読有り
M. Kobayashi, T. Kai, N. Takano, Y. Ohashi, K. Shiiki
J. Phys. : Condens. Matter. 8 7863 1996年
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The possibility of ferromagnetic BCC ruthenium 査読有り
M. Kobayashi, T. Kai, N. Takano, K. Shiiki
J. Phys. : Condens. Matter. 7 1835 1995年
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The effect of addition of Ru to Fe on the electronic structure and magnetic properties 査読有り
M. Kobayashi, N. Ando, T. Kai, N. Takano, K. Shiiki
J. Phys. : Condens. Matter. 7 9607 1995年
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EFFECT OF CHARGE NEUTRALITY CONDITION IN KKR-CPA METHOD 査読有り
T. Kai, N. Takano, K. Shiiki, M. Fukuchi
Solid State Communications 96 971 1995年
講演・口頭発表等 25
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Spin Hall conductivity in 5d elemental metals and high-entropy alloys: Influence of lattice structures and atomic arrangements
Yuki Ohnishi, Yosephine Novita Apriati, Tadashi Kai, Kohji Nakamura
ISAMMA2026 2026年6月
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Effective switching for field-free sub-ns write speed SOT-MRAM cell with canted SOT structure
T. Kai, T. V. A. Nguyen, H. Honjo, Y. Sato, T. Tanigawa, S. Ikeda, T. Endoh
17th MRAM Global Innovation Forum 2025 2025年12月
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World-most energy-efficient MRAM technology for non-volatile RAM applications
T. Y. Lee, J. M. Lee, M. K. Kim, J. S. Oh, J. W. Lee, H. M. Jeong, P. H. Jang, M. K. Joo, K. Suh, S. H. Han, D. -E. Jeong, T. Kai, J. H. Jeong, J. -H. Park, J. H. Lee, Y. H. Park, E. B. Chang, Y. K. Park, H. J. Shin, Y. S. Ji, S. H. Hwang, K. T. Nam, B. S. Kwon, M. K. Cho, B. Y. seo, Y. J. Song, G. H. Koh, K. Lee, J. -H. Lee, G. T. Jeong
IEDM 2022 2022年12月
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28nm CIS-Compatible Embeded STT-MRAM for Frame Buffer Memory
K. Lee, D. S. Kim, J. H. Bak, S. P. Ko, W. C. Lim, H. C. Shin, J. H. Lee, J. H. Park, J. H. Jeong, J. M. Lee, T. Kai, H. Sato, J. W. Lee, K. H. Ryu, Y. J. Kim, S. H. Han, B. Y. Seo, K. S. Suh, H. H. Kim, H. T. Jung, D. H. Jang, N. Y. Ji, M. J. Eom, I. H. Kim, K. Lee, K. H. Hwang, Y. J. Song, H. S. Kim
IEDM 2021 2021年12月
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Investigation of Transport Property of MgO-based Magnetic Tunnel Junction with Vacancies and Grain Boundaries by First Principles Calculations
H. Kawai, Y. Nakasaki, T. Daibou, T. Ishihara, T. Kai, J. Ito
2019 Joint MMM- Intermag Conference 2019年
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Effect of reference layer magnetic properties on storage layer switching properties with STT-MRAM
S. Itai, T. Kai, J. Ozeki, M. Nakayama, J. Ito, T. Ishihara
2019 Joint MMM- Intermag Conference 2019年1月
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Effect of stray field from adjacent bits of high-density STT-MRAM on switching current
S. Itai, T. Kai, M. Nakayama, T. Daibou, J. Ito
in Intermag 2018 2018年5月
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Large tunnel magnetoresistance of over 200% in MgO-based magnetic tunnel junction with perpendicular magnetic anisotropy
K. Nishiyama, T. Nagase, M. Nakayama, M. Yoshikawa, E. Kitagawa, T. Daibou, M. Nagamine, T. Kai, H. Yoda
11th Joint MMM/Intermag Conference 2010年
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Spin Transfer torque switching in perpendicular magnetic tunnel junctions using L10-ordered FePd electrodes
T. Daibou, M. Yoshikawa, E. Kitagawa, T. Nagase, K. Nishiyama, M. Nagamine, M. Amano, M. Nakayama, T. Kai, T.Kishi, H. Yoda
11th Joint MMM/Intermag Conference 2010年
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Lower- current and fast switching of a perpendicular TMR for high speed and high density spin-transfer- torque MRAM
T. Kishi, H. Yoda, T. Kai, T. Nagase, E. Kitagawa, M. Yoshikawa, K. Nishiyama, T. Daibou, M. Nagamine, M. Amano, S. Takahashi, M. Nakayama, N. Shimomura, H. Aikawa, S. Ikegawa, S. Yuasa, K. Yakushiji, H. Kubota, A. Fukushima, M. Oogane, T. Miyazaki, K. Ando
IEDM2008 2008年12月
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Spin Torque Transfer Switching of Perpendicular Magnetoresistive elements for High Density MRAMs
H. Yoda, T. Kishi, T. Kai, T. Nagase, M. Yoshikawa, M. Nakayama, E. Kitagawa, M. Amano, H. Aikawa, N. Shimomura, K. Nishiyama, T. Daibou, S. Takahashi, S. Ikegawa, K. Yakushiji, T. Nagahama, H. Kubota, A. Fukushima, S. Yuasa, Y. Nakatani, M. Oogane, Y. Ando, Y. Suzuki, K. Ando, T. Miyazaki
Intermag 2008 2008年
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Stable Spin transfer switching in magnetic tunnel junctions with perpendicular magnetic anisotropy
M. Nakayama, T. Kai, H. Yoda, S. Ikegawa, T. Nagase, H. Aikawa, N. Shimomura
53rd MMM Conference 2008年
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Advantage of Perpendicular MRAM using Spin Transfer Torque Switching for a high density non-volatile memory
T. Kai, M. Nakayama, J. Ozeki, H. Aikawa, S. Ikegawa, H. Yoda
53rd MMM Conference 2008年
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Pulse duration dependence and effective energy barrier for current- induced magnetization switching in MgO-based tunnel junctions
S. Ikegawa, H. Aikawa, N. Shimomura, T. Ueda, T. Kai, M. Nakayama, M. Iwayama, H. Yoda, M. Yoshikawa, Y. Asao
6th International Symposium on Metallic Multilayers (IEEE MML 2007) 2007年
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Thermal stability of MRAM with propeller shape
T. Kai, T. Nagase, M. Yoshikawa, T. Kishi, S. Ikegawa, H. Yoda
MORIS2006 2006年
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Enlargement of Operating Window and Reduction of Switching Current in MRAM with Yoke Wire
H. Aikawa, T. Ueda, T. Kai, N. Shimomura, S. Ikegawa, Y. Asao, H. Yoda
Inetrmag 2006 2006年
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Effect of magnetic domain on thermal stability for MRAM cells with propeller shape
T. Kai, N. Shimomura, Y. Shimizu, S. Ikegawa, Y. Asao, K. Tsuchida, H. Yoda
Inetrmag 2006 2006年
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Improvement in Thermal Stability of MRAM with novel MTJ cell
T. Kai, Y. Shimizu, R. Takizawa, Y. Ueda, N. Shimomura, S. Ikegawa, Y. Asao, K. Tsuchida, H. Yoda, N. Ishiwata, H. Hada, S. Tahara
MMM 2005 2005年
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Improvement of robustness against write disturbance by novel cell design for high density MRAM
T. Kai, M. Yoshikawa, M. Nakayama, Y. Fukuzumi, T. Nagase, E. Kitagawa, T. Ueda, T. Kishi, S. Ikegawa, Y. Asao, K. Tsuchida, H. Yoda, N. Ishiwata, H. Hada, S. Tahara
IEDM2004 2004年
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Influence of oxygen content on the reduction of the ordering temperature of L10 FePtCu alloy
A. Kikitsu, T. Maeda, T. Kai, T. Nagase, J. Akiyama, N. Fujioka, T. Ishigami
2003Intermag 2003年
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Ordering of FePt alloy at low temperature by addition of Cu
T. Maeda, A. Kikitsu, T. Kai, T. Nagase, H. Aikawa, J. Akiyama
2002Intermag, 2002年
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Magnetic and electronic structures of FePtCu ternary ordered alloy 招待有り
T. Kai, T. Maeda, A. Kikitsu, J. Akiyama, T. Nagase, T. Kishi
MMM2001 2001年
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Magnetization process of polycrystalline NiFe/NiO bilayers with enhanced coercivity
T. Zhao, H. Fujiwara, K. Zhang, T. Kai, C. Hou
2000Intrermag 2000年
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Effect of direct interaction between antiferromagnet grains on rotational hysteresis of torque curves in F/AF system
T. Kai, C. Hou, T. Zhao, H. Fujiwara
2000Intermag 2000年
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Prediction of Giant MagnetoResistance in Co/X Superlattice from First Principle Calculation
T. Kai, Y. Ohashi, K. Shiiki
PMRC ’97 1997年