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  1. Article

    Open Access

    Strain-induced modulation of temperature characteristics in ferrimagnetic Tb–Fe films

    This study investigates the effect of strain on the compensation temperature of ferrimagnetic Tb–Fe films formed on a flexible substrate. The compensation temperature is determined by the anomalous Hall measur...

    Shinya Ota, Pham Van Thach, Hiroyuki Awano, Akira Ando in Scientific Reports (2021)

  2. No Access

    Chapter and Conference Paper

    Develo** a Flexible Segment Unit for Redundant-DOF Manipulator Using Bending Type Pneumatic Artificial Muscle

    Robots for human are required to have safety while working with them. Therefore, we focused to a pneumatic artificial muscle which has intrinsic flexibility. In this paper, we developed a bending-type pneumati...

    Hiroki Tomori, Tomohiro Koyama in ROMANSY 23 - Robot Design, Dynamics and Co… (2021)

  3. No Access

    Article

    Giant gate-controlled proximity magnetoresistance in semiconductor-based ferromagnetic–non-magnetic bilayers

    The evolution of information technology has been driven by the discovery of new forms of large magnetoresistance, such as giant magnetoresistance1,2 and tunnelling magnetoresistance3,4, in magnetic multilayers. R...

    Kosuke Takiguchi, Le Duc Anh, Takahiro Chiba, Tomohiro Koyama in Nature Physics (2019)

  4. Article

    Open Access

    Large current modulation and tunneling magnetoresistance change by a side-gate electric field in a GaMnAs-based vertical spin metal-oxide-semiconductor field-effect transistor

    A vertical spin metal-oxide-semiconductor field-effect transistor (spin MOSFET) is a promising low-power device for the post scaling era. Here, using a ferromagnetic-semiconductor GaMnAs-based vertical spin MO...

    Toshiki Kanaki, Hiroki Yamasaki, Tomohiro Koyama, Daichi Chiba in Scientific Reports (2018)

  5. Article

    Open Access

    Correlation of the Dzyaloshinskii–Moriya interaction with Heisenberg exchange and orbital asphericity

    Chiral spin textures of a ferromagnetic layer in contact to a heavy non-magnetic metal, such as Néel-type domain walls and skyrmions, have been studied intensively because of their potential for future nanomag...

    Sanghoon Kim, Kohei Ueda, Gyungchoon Go, Peong-Hwa Jang in Nature Communications (2018)

  6. Article

    Open Access

    Induced perpendicular magnetization in a Cu layer inserted between Co and Pt layers revealed by x-ray magnetic circular dichroism

    We used x-ray absorption spectroscopy and x-ray magnetic circular dichroism to investigate the effects of inserting Cu into Co/Pt interfaces, and found that a 0.4-nm-thick inserted Cu layer showed perpendicula...

    Jun Okabayashi, Tomohiro Koyama, Motohiro Suzuki, Masahito Tsujikawa in Scientific Reports (2017)

  7. Article

    Open Access

    Investigation of spin-orbit torque using current-induced magnetization curve

    Manipulation of magnetization using current-induced torque is crucial for magnetic recording devices. Recently, the spin-orbit torque (SOT) that emerges in a ferromagnetic thin film on a heavy metal is focused...

    Tomohiro Koyama, Yicheng Guan, Daichi Chiba in Scientific Reports (2017)

  8. No Access

    Article

    Anesthetic management of nonintubated video-assisted thoracoscopic surgery using epidural anesthesia and dexmedetomidine in three patients with severe respiratory dysfunction

    Nonintubated video-assisted thoracoscopic surgery (VATS) has been reported to be safe and feasible for patients with various thoracic diseases, including those who have respiratory dysfunction. In nonintubated...

    Yoshika Iwata, Yusuke Hamai, Tomohiro Koyama in Journal of Anesthesia (2016)

  9. Article

    Open Access

    Erratum: Electric-field control of magnetic moment in Pd

    Several magnetic properties have recently become tunable with an applied electric field. Particularly, electrically controlled magnetic phase transitions and/or magnetic moments have attracted attention becaus...

    Aya Obinata, Yuki Hibino, Daichi Hayakawa, Tomohiro Koyama in Scientific Reports (2015)

  10. Article

    Open Access

    Electric-field control of magnetic moment in Pd

    Several magnetic properties have recently become tunable with an applied electric field. Particularly, electrically controlled magnetic phase transitions and/or magnetic moments have attracted attention becaus...

    Aya Obinata, Yuki Hibino, Daichi Hayakawa, Tomohiro Koyama in Scientific Reports (2015)

  11. No Access

    Article

    Orthostatic intolerance during early mobilization following video-assisted thoracic surgery

    Early postoperative mobilization is crucial for early ambulation to reduce postoperative pulmonary complications after lung resection. However, orthostatic intolerance (OI) may delay patient recovery, leading ...

    Toshiyuki Mizota, Yoshika Iwata, Hiroki Daijo, Tomohiro Koyama in Journal of Anesthesia (2013)

  12. No Access

    Article

    Successful tracheal intubation with the GlideScope® in a patient with CHARGE syndrome

    Satoshi Shimizu, Tomohiro Koyama, Toshiyuki Mizota in Journal of Anesthesia (2013)

  13. No Access

    Article

    Two-barrier stability that allows low-power operation in current-induced domain-wall motion

    Energy barriers in magnetization reversal dynamics have long been of interest because the barrier height determines the thermal stability of devices as well as the threshold force triggering their dynamics. Es...

    Kab-** Kim, Ryo Hiramatsu, Tomohiro Koyama, Kohei Ueda in Nature Communications (2013)

  14. No Access

    Article

    Microglial activation involved in morphine tolerance is not mediated by toll-like receptor 4

    Morphine is a powerful analgesic but its effect is often diminished owing to the development of tolerance. It has been suggested that morphine activates microglia through its action on the toll-like receptor 4...

    Hiroshi Fukagawa, Tomohiro Koyama, Masahiro Kakuyama in Journal of Anesthesia (2013)

  15. No Access

    Article

    Postoperative continuous intravenous infusion of fentanyl is associated with the development of orthostatic intolerance and delayed ambulation in patients after gynecologic laparoscopic surgery

    Early ambulation is essential for rapid functional recovery after surgery; however, orthostatic intolerance may delay recovery and cause syncope, leading to potential serious complications such as falls. Opioi...

    Yoshika Iwata, Yoko Mizota, Toshiyuki Mizota, Tomohiro Koyama in Journal of Anesthesia (2012)

  16. No Access

    Article

    The Shigella flexneri effector OspI deamidates UBC13 to dampen the inflammatory response

    Shigella flexneri translocates several virulence factors into host cells during infection; one of these proteins, OspI, is a glutamine deamidase that specifically modifies UBC13, a protein involved in immune sign...

    Takahito Sanada, Minsoo Kim, Hitomi Mimuro, Masato Suzuki, Michinaga Ogawa in Nature (2012)

  17. No Access

    Article

    Involvement of the κ-opioid receptor in nitrous oxide-induced analgesia in mice

    Nitrous oxide (N2O)-induced analgesia is thought to be mediated by endogenous opioids. We previously showed that the μ-opioid receptor is not required for the analgesic action of N2O in mice using a gene knockout...

    Tomohiro Koyama, Kazuhiko Fukuda in Journal of Anesthesia (2010)

  18. No Access

    Article

    Bacteria hijack integrin-linked kinase to stabilize focal adhesions and block cell detachment

    The intestinal epithelium undergoes rapid self-renewal and exfoliation from the basement membrane upon bacterial infection, a process that acts as a defence system against the pathogen. Despite this, many ente...

    Minsoo Kim, Michinaga Ogawa, Yukihiro Fujita, Yuko Yoshikawa, Takeshi Nagai in Nature (2009)

  19. No Access

    Article

    Nociceptin receptor antagonist JTC-801 inhibits nitrous oxide-induced analgesia in mice

    The mechanism of the analgesic effect of nitrous oxide (N2O) has not been completely clarified. Although we have reported that the analgesic effect of N2O was significantly decreased in nociceptin-orphanin FQ (N/...

    Tomohiro Koyama, Kazuhiko Fukuda in Journal of Anesthesia (2009)