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Journal Articles

Spontaneous topological Hall effect induced by non-coplanar antiferromagnetic order in intercalated van der Waals materials

Takagi, Hirotaka*; Takagi, Rina*; Minami, Susumu*; Nomoto, Takuya*; Oishi, Kazuki*; Suzuki, Michito*; Yanagi, Yuki*; Hirayama, Motoaki*; Khanh, N.*; Karube, Kosuke*; et al.

Nature Physics, 19(7), p.961 - 968, 2023/07

https://doi.org/10.1038/s41567-023-02017-3
 Times Cited Count：8 Percentile：96.88(Physics, Multidisciplinary)

Journal Articles

Flexible heat-flow sensing sheets based on the longitudinal spin Seebeck effect using one-dimensional spin-current conducting films

Kirihara, Akihiro*; Kondo, Koichi*; Ishida, Masahiko*; Ihara, Kazuki*; Iwasaki, Yuma*; Someya, Hiroko*; Matsuba, Asuka*; Uchida, Kenichi*; Saito, Eiji; Yamamoto, Naoharu*; et al.

Scientific Reports (Internet), 6, p.23114_1 - 23114_7, 2016/03

https://doi.org/10.1038/srep23114
 Times Cited Count：62 Percentile：90.56(Multidisciplinary Sciences)

Heat-flow sensing is expected to be an important technological component of smart thermal management in the future. Conventionally, the thermoelectric (TE) conversion technique, which is based on the Seebeck effect, has been used to measure a heat flow by converting the flow into electric voltage. However, for ubiquitous heat-flow visualization, thin and flexible sensors with extremely low thermal resistance are highly desired. Recently, another type of TE effect, the longitudinal spin Seebeck effect (LSSE), has aroused great interest because the LSSE potentially offers favourable features for TE applications such as simple thin-film device structures. Here we demonstrate an LSSE-based flexible TE sheet that is especially suitable for a heat-flow sensing application. This TE sheet contained a Ni$$_{0.2}$$Zn$$_{0.3}$$Fe$$_{2.5}$$O$$_4$$ film which was formed on a flexible plastic sheet using a spray-coating method known as ferrite plating. The experimental results suggest that the ferrite-plated film, which has a columnar crystal structure aligned perpendicular to the film plane, functions as a unique one-dimensional spin- current conductor suitable for bendable LSSE-based sensors. This newly developed thin TE sheet may be attached to differently shaped heat sources without obstructing an innate heat flux, paving the way to versatile heat-flow measurements and management.

Oral presentation

Stability of $$^{186}$$Re- and $$^{188}$$Re-DMSAs and removal of impurity in the product

Komoto, Kazuki*; Nogawa, Norio*; Sato, Jun*; Makide, Yoshihiro*; Morikawa, Naotake*; Hashimoto, Kazuyuki; Sorita, Takami

no journal, , 

Complex compound of $$^{186}$$Re and $$^{188}$$Re with meso-2,3-dimercaptosuccinic acid (DMSA) is expected to be effective against cancerous disease. This compound is synthesized with high radiochemical yield by use of SnCl$$_{2}$$ as reducing reagent. However, the product contains a large amount of SnCl$$_{2}$$ which is harmful to human body. The removal of tin impurity was tested with cation exchange resin. $$^{186}$$Re-DMSA complex was also obtained with high radiochemical yield by use of other harmless reducing agents (L-ascorbic acid, Na$$_{2}$$SO$$_{3}$$, H$$_{3}$$PO$$_{3}$$). Synthesized $$^{186}$$Re-DMSA by use of SnCl$$_{2}$$ was stable in sodium acetate buffer for 5 hours, while survival amount of $$^{186}$$Re-DMSA synthesized by other reducing agents decreased in a short time.

Oral presentation

Crystal structure, phase transition and thermal expansion of Li$$_{2}$$TiO$$_{3}$$; Analysis with high resolution by high-temperature synchrotron X-ray diffraction

Hashimoto, Takuya*; Omoto, Kazuki*; Sasaki, Kazuya*; Terai, Takayuki*; Hoshino, Tsuyoshi; Yashima, Masatomo*

no journal, , 

no abstracts in English

Oral presentation

Field-induced magnetic phase transitions in the triangular-lattice antiferromagnet CuFeO$$_{2}$$ investigated by time-of-flight neutron diffraction in long-pulse magnetic fields

Watanabe, Masao; Nakajima, Taro*; Inamura, Yasuhiro; Matsui, Kazuki*; Kanda, Tomoki*; Nomoto, Tetsuya*; Oishi, Kazuki*; Kawamura, Yukihiko*; Saito, Hiraku*; Tamatsukuri, Hiromu; et al.

no journal, , 

In recent years, due to advances in precision measurement technology in pulsed magnetic fields, a novel magnetic state was discovered in a strong magnetic field. We constructed a measurement environment that can comprehensively explore the reciprocal lattice space under magnetic fields up to 14 Tesla by combining the long-pulse magnetic field generated by the supercapacitor and pulsed neutrons at J-PARC. This equipment can generate a magnetic field that is sufficiently longer than the time width (about 10 milliseconds) of the multi-wavelength neutron pulse passing through the sample. This method was used to investigate the magnetic phase transition in the frustrated magnet CuFeO$$_{2}$$.

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