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Total-reflection high-energy positron diffraction (TRHEPD) for structure determination of the topmost and immediate sub-surface atomic layers

深谷 有喜; 河裾 厚男*; 一宮 彪彦*; 兵頭 俊夫*

Journal of Physics D; Applied Physics, 52(1), p.013002_1 - 013002_19, 2019/01

 パーセンタイル:100(Physics, Applied)



Spin caloric effects in antiferromagnets assisted by an external spin current

Gomonay, O.*; 山本 慧; Sinova, J.*

Journal of Physics D; Applied Physics, 51(26), p.264004_1 - 264004_9, 2018/07

 被引用回数:2 パーセンタイル:37.49(Physics, Applied)



Mn$$_{2}$$VAl Heusler alloy thin films; Appearance of antiferromagnetism and exchange bias in a layered structure with Fe

土屋 朋生*; 小林 亮太*; 窪田 崇秀*; 斉藤 耕太郎*; 小野 寛太*; 大原 高志; 中尾 朗子*; 高梨 弘毅*

Journal of Physics D; Applied Physics, 51(6), p.065001_1 - 065001_7, 2018/02

 被引用回数:1 パーセンタイル:100(Physics, Applied)

Mn$$_{2}$$VAl Heusler alloy films were epitaxially grown on MgO(100) single-crystal substrates by ultra-high-vacuum magnetron sputtering. A2- and L21-type Mn$$_{2}$$VAl order was controlled by the deposition temperature. A2-type Mn$$_{2}$$VAl films showed no spontaneous magnetization, while L21-type Mn$$_{2}$$VAl films showed ferrimagnetic behaviour with a maximum saturation magnetization of 220 emu/cm$$^{3}$$ at room temperature (RT). An antiferromagnetic reflection was observed with neutron diffraction at RT for an A2-type Mn$$_{2}$$VAl film deposited at 400$$^{circ}$$C. A bilayer sample of the antiferromagnetic A2-type Mn$$_{2}$$VAl and Fe showed an exchange bias of 120 Oe at 10 K.


Laser micro-processing as a tool for constructing insulator-based magnonic crystal

大門 俊介*; 井口 亮*; 内田 健一*; 齊藤 英治

Journal of Physics D; Applied Physics, 48(16), p.164014_1 - 164014_4, 2015/04

 被引用回数:3 パーセンタイル:74.64(Physics, Applied)

Y$$_{3}$$Fe$$_{5}$$O$$_{12}$$ (YIG) films with a periodic-antidot-array structure fabricated by laser microprocessing is shown to exhibit clear characteristics of two-dimensional (2D) magnonic crystals. The experimental results demonstrate that the spin-wave-resonance spectra in the YIG films are modulated by the periodic antidot structure. The frequency and lattice constant dependences of the spectra are well reproduced by a numerical calculation based on magnonic band structures of the 2D magnonic crystals. Since the laser micro-processing is compatible with various thin-film fabrication methods, it can be a powerful tool for constructing magnonic crystals.


Influence of interface condition on spin-Seebeck effects

Qiu, Z.*; Hou, D.*; 内田 健一*; 齊藤 英治

Journal of Physics D; Applied Physics, 48(16), p.164013_1 - 164013_5, 2015/04

 被引用回数:26 パーセンタイル:12.17(Physics, Applied)

The longitudinal spin-Seebeck effect (LSSE) has been investigated for Pt/yttrium iron garnet (YIG) bilayer systems. The magnitude of the voltage induced by the LSSE is found to be sensitive to the Pt/YIG interface condition. We observed large LSSE voltage in a Pt/YIG system with a better crystalline interface, while the voltage decays steeply when an amorphous layer is introduced at the interface artificially.


Sign of inverse spin Hall voltages generated by ferromagnetic resonance and temperature gradients in yttrium iron garnet platinum bilayers

Schreier, M.*; Bauer, G. E. W.*; Vasyuchka, V.*; Flipse, J.*; 内田 健一*; Lotze, J.*; Lauer, V.*; Chumak, A.*; Serga, A.*; 大門 俊介*; et al.

Journal of Physics D; Applied Physics, 48(2), p.025001_1 - 025001_5, 2015/01

 被引用回数:38 パーセンタイル:7.07(Physics, Applied)

We carried out a concerted effort to determine the absolute sign of the inverse spin Hall effect voltage generated by spin currents injected into a normal metal. We focus on yttrium iron garnet (YIG)|platinum bilayers at room temperature, generating spin currents by microwaves and temperature gradients. We find consistent results for different samples and measurement setups that agree with theory. We suggest a right-hand-rule to define a positive spin Hall angle corresponding to the voltage expected for the simple case of scattering of free electrons from repulsive Coulomb charges.


Capacitance transient study of a bistable deep level in e$$^{-}$$-Irradiated n-type 4H-SiC

Beyer, F. C.*; Hemmingsson, C. G.*; Pedersen, H.*; Henry, A.*; 磯谷 順一*; 森下 憲雄*; 大島 武; Janz$'e$n, E.*

Journal of Physics D; Applied Physics, 45(45), p.455301_1 - 455301_7, 2012/11

 被引用回数:7 パーセンタイル:59.31(Physics, Applied)

A bistable center, named FB center, in electron irradiated 4H-SiC was observed using capacitance transient techniques. In configuration called "$$A$$", the deep level known as EH5 ($$E$$$$_{a}$$ = $$E$$$$_{C}$$ - 1.07 eV) is detected in the deep level transient spectroscopy spectrum, whereas for configuration called "$$B$$", no obvious deep level is observed in the accessible part of the band gap. Isochronal annealing revealed that the transition temperatures to be from $$A$$ to $$B$$ is more than 730K, and for the opposite process from $$B$$ to $$A$$ is about 710 K. The energy needed to conduct the transformations were determined to be $$E$$$$_{A}$$($$A$$ to $$B$$) = (2.1 $$pm$$ 0.1) eV and $$E$$$$_{A}$$($$B$$ to $$A$$) = (2.3 $$pm$$ 0.1) eV, respectively. Since the bistable FB centre is already present after low-energy electron irradiation (200 keV), it is likely related to carbon.


Single-shot observation of growing streamers using an ultrafast camera

高橋 栄一*; 加藤 進*; 古谷 博秀*; 佐々木 明; 岸本 泰明*; 高田 健司*; 松村 哲*; 佐々木 裕康*

Journal of Physics D; Applied Physics, 44(30), p.302001_1 - 302001_4, 2011/08

 被引用回数:4 パーセンタイル:75.1(Physics, Applied)



Controlling branching in streamer discharge by laser background ionization

高橋 栄一*; 加藤 進*; 佐々木 明; 岸本 泰明*; 古谷 博秀*

Journal of Physics D; Applied Physics, 44(7), p.075204_1 - 075204_6, 2011/02

 被引用回数:15 パーセンタイル:35.96(Physics, Applied)



Simulation and experiments of the laser induced breakdown of air for femtosecond to nanosecond order pulses

Koga, J. K.; 森林 健悟; 福田 祐仁; Bulanov, S. V.; 匂坂 明人; 小倉 浩一; 大道 博行; 山極 満; 木村 豊秋*; 藤川 武敏*; et al.

Journal of Physics D; Applied Physics, 43(2), p.025204_1 - 025204_15, 2010/01

 被引用回数:10 パーセンタイル:51.51(Physics, Applied)

Three dimensional simulations and experimental results for the laser induced breakdown of air are presented. The simulations include the laser propagation, multi-photon and impact ionization, and heating of the electrons using accurate atomic and molecular data. For laser pulses of duration from 100 femto-seconds to 1 nano-second mechanisms for the breakdown of air based on the pulse duration and intensity ranging from optical field ionization to electron impact ionization are found. The laser energies at which the breakdown occurs are found to be in good agreement with experimental results.


Oxidation of xylene and its irradiation byproducts using an electron-beam irradiating a $$gamma$$-Al$$_{2}$$O$$_{3}$$ bed

箱田 照幸; 松本 加奈江*; 水野 彰*; 広田 耕一

Journal of Physics D; Applied Physics, 41(15), p.155202_1 - 155202_7, 2008/08

 被引用回数:2 パーセンタイル:87.89(Physics, Applied)



Existence and origin of compensation layer thickness in Tb$$_{20}$$Co$$_{80}$$/Pd multilayered films

田中 真人*; 朝日 透*; 安居院 あかね; 水牧 仁一朗*; 佐山 淳一*; 逢坂 哲彌*

Journal of Physics D; Applied Physics, 41(5), p.055003_1 - 055003_4, 2008/03

 被引用回数:4 パーセンタイル:77.45(Physics, Applied)



Study on N$$_{2}$$-added and B-doped effect in Co/Pd multilayered films using soft X-ray absorption and magnetic circular dichroism

安居院 あかね; 朝日 透*; 佐山 淳一*; 川治 純*; 水牧 仁一朗*; 田中 真人*; 逢坂 哲彌*

Journal of Physics D; Applied Physics, 39(14), p.2881 - 2885, 2006/07

 被引用回数:1 パーセンタイル:94.57(Physics, Applied)



A Model for striation formation in ac PDP discharges

村岡 克紀*; 安積 正史; 鈴木 敬三*; 山形 幸彦*; 矢木 雅敏*

Journal of Physics D; Applied Physics, 39(10), p.2135 - 2139, 2006/05

 被引用回数:5 パーセンタイル:75.61(Physics, Applied)



Decomposition of gas-phase diphenylether at 473 K by electron beam generated plasma

Kim, H.*; 箱田 照幸; 小嶋 拓治

Journal of Physics D; Applied Physics, 36(5), p.473 - 481, 2003/03

 被引用回数:6 パーセンタイル:68.92(Physics, Applied)



Morphology evolution of thin Ni film on MgO(100) substrate

Lin, C.; Xu, Y. H.; 楢本 洋; Wei, P.; 北澤 真一; 鳴海 一雅

Journal of Physics D; Applied Physics, 35(15), p.1864 - 1866, 2002/08

 被引用回数:8 パーセンタイル:61.69(Physics, Applied)



X-ray and fourier transformed infrared investigation of $$beta$$-SiC growth by ion Implantation

Zhang, Z.; 鳴海 一雅; 楢本 洋; 山本 春也; 宮下 敦巳

Journal of Physics D; Applied Physics, 32(17), p.2236 - 2240, 1999/09

 被引用回数:14 パーセンタイル:41.79(Physics, Applied)

Si(100)基板に150keV $$^{12}$$C$$^{+}$$イオンを、低温で9.0$$times$$10$$^{17}$$/cm$$^{2}$$まで注入して非晶質なSi+C層を形成後、熱処理による固相結晶成長過程を、X線回折法、フーリエ赤外分光法によって調べた。その結果、以下の結論を得た。(1)化学量論比を考慮してイオン注入を行うことにより、Si中で、結晶性の$$beta$$-SiCを形成できる。(2)固相結晶成長させる場合、大量イオン注入の条件下でも、基板を非晶質状態に保つことが重要で、その後の熱処理過程に影響を与える。


MeV ion generation by an ultra-intense short-pulse laser; Application to positron emitting radionuclide production

山極 満; Koga, J. K.

Journal of Physics D; Applied Physics, 32(19), p.2526 - 2528, 1999/00

 被引用回数:17 パーセンタイル:36.29(Physics, Applied)


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