Juntendo Medical Journal Vol 67 Issue 3

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Voltage Control of Magnetic Properties in Ferromagnetic Thin Films

Low-power voltage control of magnetic properties of ferromagnetic thin films has long been of interest for many technical applications including magnetic random access memory (MRAM) devices, high-frequency tuneable magnetic devices and magnetic sensors. This research explores novel routes to further develop theses devices. This thesis presents a study of the variation of magnetic properties of permalloy (Ni80Fe20) and Ni thin films when part of an ionic liquid cell via a voltage induced oxidation thinning/thickening of the magnetic film. The cells consisted of a thin ferromagnetic film (<50 nm), the ionic liquid 1-Ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIMTSFI) and an indium-tin oxide (ITO) coated glass slide. Magneto-optical Kerr effect (MOKE) magnetometry and vibrating sample magnetometry (VSM) demonstrated drops in coercivity and magnetisation by more than 50%, upon application of low voltages (<4 V), which were partially recovered upon reversal of the voltage polarity. X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry studies showed a voltage dependent oxidation of the thin films and gave the electrochemical window of the cell to be approximately 4.2 V, with redox peaks at ± 2.5 V. Ferromagnetic resonance (FMR) spectroscopy demonstrated thickness dependent changes in magnetisation of 5 nm, 10 nm and 50 nm permalloy films, while changes in surface anisotropy and Gilbert damping constant were also observed. This work hopes to further the understanding of the mechanisms involved in the voltage control of magnetic properties in thin films and advance the technology for future applications

TaikOz – Performing Australian Taiko

TaikOz have for twenty years pioneered taiko and shakuhachi music in Australia to international acclaim. Taiko, the Japanese word for drum, is also the name of a multifaceted collection of Japanese-looking drumming cultures popular worldwide since the 1960s. As taiko players bolster the legitimacy of their activities with tangential histories of older, even imagined, Japanese art forms, Australian musicians TaikOz spend considerable effort trying to match their practice to this discourse while also challenging its validity. Stuck fitting in as outsiders, TaikOz head taiko proficiency globally and collaborate with the pioneers of the staged genre. By assessing several TaikOz compositions and collaborative projects, and through compilation of all print media mentions of TaikOz, this thesis demonstrates that the stories told about taiko and TaikOz are skewed. Through interviews and fieldwork, TaikOz revealed the ways they work, but how their processes are often unrecognised or misinterpreted. This thesis investigates where communicative errors are occurring and promotes that using a template of performativity might yield more honest renderings of this inter-cultural artistic exercise into text

日本医科大学研究業績年報 令和4(2022年度)

日本医科大学research repor

The HBP1 tumor suppressor is a negative epigenetic regulator of MYCN driven neuroblastoma through interaction with the PRC2 complex

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The greening of aid: the political ecology of Japans bilateral international cooperation with the Philippines

EThOS - Electronic Theses Online ServiceGBUnited Kingdo