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論文

Study on ferromagnetic ordering of FeRh thin films induced by energetic heavy ion irradiation by means of X-ray magnetic circular dichroism

愛甲 一馬*; 唐木 淳志*; 奥田 修一*; 齋藤 勇一; 神谷 富裕; 中村 哲也*; 木下 豊彦*; 岩瀬 彰宏*; 松井 利之*

Nuclear Instruments and Methods in Physics Research B, 314, p.99 - 102, 2013/11

 被引用回数:3 パーセンタイル:67.8(Instruments & Instrumentation)

The ion irradiation induced magnetic state of the FeRh thin films with 10 MeV Iodine ion beam has been investigated by the measurements of a superconducting quantum interference device (SQUID) magnetometer and soft X-ray magnetic circular dichroism (XMCD). It was clearly shown in the magnetization loops by SQUID measurements that the ion irradiation induced ferromagnetic state in the FeRh thin films even below room temperature. This was also confirmed by the XMCD measurements. However ion irradiation fluence dependence on magnetic state at the sample surface measured by XMCD was totally different from that by use of SQUID. Moreover, it was revealed by XMCD sum rule analysis that the ion irradiation induced ferromagnetism of FeRh thin films was mainly dominated by the spin moment.

論文

MFM observation of micrometer-sized magnetic patterns produced by heavy ion microbeam irradiation in FeRh films

愛甲 一馬*; 唐木 淳志*; 松井 利之*; 岩瀬 彰宏*; 佐藤 隆博; 高野 勝昌*; 江夏 昌志; 齋藤 勇一; 神谷 富裕

JAEA-Review 2012-046, JAEA Takasaki Annual Report 2011, P. 133, 2013/01

As the irradiation effect appears only within irradiated regions, we have used ion micro-beam irradiation to produce micrometer-sized and two-dimensional magnetic patterns on the surface of FeRh thin films. The thin films nearly show the anti-ferromagnetic state at room temperature. To realize the lateral magnetic modification on the sample surface, the micro-beam irradiation was performed by using 3-MeV tandem accelerator at the TIARA. The focused 10 MeV iodine ion micro-beam, which had a rectangular shape of 2$$mu$$m $$times$$ 4$$mu$$m, was scanned on the FeRh thin film surface. After irradiation, the surface roughness and the magnetic state were observed by means of atomic force microscopy (AFM) and magnetic force microscopy (MFM), respectively. The AFM images show that the ion micro-beam does not create any topographic modification at the FeRh surface, while an array with 2$$mu$$m $$times$$ 4$$mu$$m bright rectangles at designated regular intervals is seen in the MFM image. The ion micro-beam is a useful tool for the fabrication of two-dimensional and micrometer-sized magnetic patterns on FeRh samples.

論文

MFM and PEEM observation of micrometre-sized magnetic dot arrays fabricated by ion-microbeam irradiation in FeRh thin films

愛甲 一馬*; 唐木 淳志*; 松井 利之*; 岩瀬 彰宏*; 佐藤 隆博; 高野 勝昌*; 江夏 昌志; 齋藤 勇一; 神谷 富裕; 大河内 拓雄*; et al.

Journal of Synchrotron Radiation, 19(2), p.223 - 226, 2012/03

 被引用回数:6 パーセンタイル:62.38(Instruments & Instrumentation)

FeRh thin films were irradiated with 10 MeV iodine ion microbeam to produce the lateral magnetic modification in micron-meter scale. Two-dimensional magnetic dot arrays with the dimension of approximately 2$$times$$4 $$mu$$m$$^2$$ as well as 10$$times$$10 $$mu$$m$$^2$$ were successfully produced on the FeRh surface, which was observed by magnetic force microscopy. The results of the photoelectron emission microscopy combined with X-ray magnetic circular dichroism reveal that the easy axis of the magnetization of the ion beam irradiated ferromagnetism in the FeRh thin films lies in the film planes along the $$<$$001$$>$$ direction of the MgO substrates.

論文

Establishment and optimization of angle dispersive neutron diffraction bulk texture measurement environments

徐 平光; 秋田 貢一; 鈴木 裕士; 目時 直人; 盛合 敦

Materials Transactions, 53(11), p.1831 - 1836, 2011/11

 被引用回数:4 パーセンタイル:64.31(Materials Science, Multidisciplinary)

Different from electron back-scattering diffraction and X-ray diffraction, neutron diffraction enables to directly measure the bulk texture because of high penetration and large spot size of neutron beam and also provides the possibility to investigate the preferred orientation distributions of multiphase materials, coarse-grained materials and low symmetry materials including hexagonal metals, ceramics and rocks. In this paper, the texture measurement technical environments of two angle dispersive neutron diffractometers were established and optimized respectively, and their reliabilities were quantitatively examined through evaluating the bulk textures of warm-pressed magnesium alloy and rapid annealed multilayered multiphase steel composite. It is found that the MUSASI-L neutron diffractometer with a single tube detector through selecting the proper collimation angle may achieve the similar texture evaluation reliability to the RESA-2 neutron diffractometer with one-dimensional position-sensitive detector, so that both of them are available to directly measure the bulk textures of various materials.

口頭

イオンビーム誘発UVB耐性及び感受性変異体イネの単離と変異原因遺伝子の解析

高野 成央*; 山本 充*; 高橋 祐子*; 寺西 美佳*; 坂本 綾子; 長谷 純宏; 田中 淳; Wu, J.*; 松本 隆*; 土岐 精一*; et al.

no journal, , 

成層圏オゾン層の破壊に伴うUVB量の増加は、穀物の生産量に影響を及ぼすことが危惧されている。われわれは、植物におけるUVB耐性機構の全容を明らかにするため、UVB抵抗性品種ササニシキに炭素イオンビームを照射し、UVB耐性もしくは感受性を示す変異体の作出を試みた。約6000系統の照射当代から得られた自殖後代に対してRoot bending assay法による選抜とUVB付加条件下での生育検定を行った結果、UVB耐性変異体を2系統、UVB感受性系統を3系統得ることに成功した。このなかでUVB耐性を示すUVTSa-319、UVB感受性を示すUVSSa-1のゲノムDNAを用いてComparative Genomic Hybridization(CGH)解析を行い、各変異体で欠失している染色体部位を同定した。その結果、UVTSa-319ではイネ第7染色体の約45kbが、またUVSSa-1でも同じく第7染色体の52kbがそれぞれ欠失していることが明らかとなった。現在、これら欠失した遺伝子の機能とUVB耐性、もしくは感受性との関連について解析を進めている。

口頭

Current status of bulk texture measurement technique by neutron diffraction

徐 平光; 鈴木 裕士; 秋田 貢一; 盛合 敦; 目時 直人

no journal, , 

The precise measurement of textures of materials is essential for optimizing anisotropic properties of polycrystalline materials. Neutron diffraction, different with the X-ray diffraction and the electron diffraction, enables to measure large samples with large beam spot and to get bulk average information including texture with high statistics and to evaluate the microstructure evolution under various environments, especially for multiphase materials and coarse-grained materials. Here, the instrument status of MUSASI-L and RESA-2 neutron diffractometers at JRR-3 were reported and the high reliability of neutron diffraction bulk texture measurement technique was demonstrated. Finally, several application cases of texture evaluation of metallic materials including ARBed IF steels, multilayered steel composite and magnesium alloy were simply introduced.

口頭

重イオンマイクロビーム照射による鉄ロジウム薄膜中の微小磁性アレイの作製

岩瀬 彰宏*; 松井 利之*; 唐木 淳志*; 愛甲 一馬*; 佐藤 隆博; 高野 勝昌*; 江夏 昌志; 齋藤 勇一; 神谷 富裕

no journal, , 

Fe-Rhは、室温、あるいはそれ以下の低温で元来反強磁性を示す金属間化合物であるが、高エネルギーイオン照射により、低温での磁性が反強磁性から強磁性に変化することが、最近のわれわれの研究により明らかになってきた。本実験は、その結果を利用して、TIARAイオンマイクロビーム照射により、Fe-Rh表面に微小磁性アレイを作製することを目的として実施した。実験では、TIARAタンデム加速器からの2$$mu$$m$$times$$4$$mu$$m、及び10$$mu$$m$$times$$10$$mu$$mの形状のヨウ素イオンのマイクロビームを用い、Fe-Rh試料に幾つかの描画パターンで照射した。照射による試料表面での構造変化を原子間力顕微鏡(AFM)、磁性変化を磁気力顕微鏡(MFM)で観測した結果、AFM像では、照射領域の構造変化は観測されないが、MFM像では、描画パターンに即した強磁性微小領域が観測された。本実験結果から、イオンマイクロビーム照射を用いることにより、Fe-Rh薄膜中に、マイクロメートルスケールの微小磁気アレイの作製が可能であることがわかった。また、マイクロビーム照射量を制御することにより、磁化値の異なった微小磁化領域をマイクロビームで作製することが可能であることがわかった。

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