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Journal Articles

Electric field effect on the magnetic domain wall creep velocity in Pt/Co/Pd structures with different Co thicknesses

Koyama, Tomohiro*; Ieda, Junichi; Chiba, Daichi*

Applied Physics Letters, 116(9), p.092405_1 - 092405_5, 2020/03

 Times Cited Count:0 Percentile:100(Physics, Applied)

Journal Articles

Polaronic nature of a muonium-related paramagnetic center in SrTiO$$_3$$

Ito, Takashi; Higemoto, Wataru; Koda, Akihiro*; Shimomura, Koichiro*

Applied Physics Letters, 115(19), p.192103_1 - 192103_4, 2019/11

 Times Cited Count:2 Percentile:47.12(Physics, Applied)

Journal Articles

Angular momentum compensation manipulation to room temperature of the ferrimagnet Ho$$_{3-x}$$Dy$$_{x}$$Fe$$_5$$O$$_{12}$$ detected by the Barnett effect

Imai, Masaki; Chudo, Hiroyuki; Ono, Masao; Harii, Kazuya; Matsuo, Mamoru; Onuma, Yuichi*; Maekawa, Sadamichi; Saito, Eiji

Applied Physics Letters, 114(16), p.162402_1 - 162402_4, 2019/04

 Times Cited Count:6 Percentile:15.28(Physics, Applied)

Journal Articles

Magnetomechanical sensing based on delta-E effect in Y$$_3$$Fe$$_5$$O$$_{12}$$ micro bridge

Arisawa, Hiroki*; Daimon, Shunsuke*; Oikawa, Yasuyuki*; Seo, Y.-J.*; Harii, Kazuya; Oyanagi, Koichi*; Saito, Eiji

Applied Physics Letters, 114(12), p.122402_1 - 122402_5, 2019/03

 Times Cited Count:2 Percentile:47.12(Physics, Applied)

Journal Articles

Observation of gyromagnetic reversal

Imai, Masaki; Ogata, Yudai*; Chudo, Hiroyuki; Ono, Masao; Harii, Kazuya; Matsuo, Mamoru*; Onuma, Yuichi*; Maekawa, Sadamichi; Saito, Eiji

Applied Physics Letters, 113(5), p.052402_1 - 052402_3, 2018/07

 Times Cited Count:7 Percentile:31.97(Physics, Applied)

Journal Articles

Nanoscale spatial analysis of clay minerals containing cesium by synchrotron radiation photoemission electron microscopy

Yoshigoe, Akitaka; Shiwaku, Hideaki; Kobayashi, Toru; Shimoyama, Iwao; Matsumura, Daiju; Tsuji, Takuya; Nishihata, Yasuo; Kogure, Toshihiro*; Okochi, Takuo*; Yasui, Akira*; et al.

Applied Physics Letters, 112(2), p.021603_1 - 021603_5, 2018/01

 Times Cited Count:2 Percentile:72.27(Physics, Applied)

A synchrotron radiation photoemission electron microscope (SR-PEEM) was applied to demonstrate pinpoint analysis of micrometer-sized weathered biotite clay particles with artificially adsorbed cesium (Cs) atoms. Despite the insulating properties of the clay, we observed the spatial distributions of constituent elements (Si, Al, Cs, Mg, Fe) without charging issues. We found that Cs atoms were likely to be adsorbed evenly over the entire particle. Spatially-resolved X-ray absorption spectra (XAS) of the Cs M$$_{4,5}$$-edge region showed Cs to be present in a monocation state (Cs$$^{+}$$). Further pinpoint XAS measurements were also performed at the Fe L$$_{2,3}$$-edge to determine the chemical valence of the Fe atoms. Our results demonstrate the utility of SR-PEEM as a tool for spatially-resolved chemical analyses of various environmental substances, which is not limited by the poor conductivity of samples.

Journal Articles

Effect of rattling motion without cage structure on lattice thermal conductivity in LaOBiS$$_{2-x}$$Se$$_x$$

Lee, C. H.*; Nishida, Atsuhiro*; Hasegawa, Takumi*; Nishiate, Hirotaka*; Kunioka, Haruno*; Kawamura, Seiko; Nakamura, Mitsutaka; Nakajima, Kenji; Mizuguchi, Yoshikazu*

Applied Physics Letters, 112(2), p.023903_1 - 023903_4, 2018/01

 Times Cited Count:18 Percentile:11.21(Physics, Applied)

Low energy phonons in LaOBiS$$_{2-x}$$Se$$_x$$ are studied using inelastic neutron scattering. Dispersionless flat phonon branches that are mainly associated with a large vibration of Bi atoms are observed at a relatively low energy of $$E$$ = 6 - 6.7 meV. The phonon energy softens upon Se doping owing to its heavier atomic mass than S atom and the expansion of lattice constant. Simultaneously, the lattice thermal conductivity lowered upon Se doping as the same manner of the phonon softening. These suggest that despite the lack of an oversized cage in LaOBiS$$_{2-x}$$Se$$_x$$, rattling motions of Bi atoms can scatter phonon like rattling in cage compounds, contributing to enhance the thermoelectric property.

Journal Articles

Photo-oxidative doping in $$pi$$-conjugated zig-zag chain of carbon atoms with sulfur-functional group

Ikeura, Hiromi*; Sekiguchi, Tetsuhiro

Applied Physics Letters, 111(23), p.231605_1 - 231605_4, 2017/12

 Times Cited Count:0 Percentile:100(Physics, Applied)

Photo-oxidative doping processes were studied for the trans-polyacetylene (PA) backbone with the -SCH$$_{3}$$ side group as a chemically representative of the S-functionalized zig-zag graphene nanoribbon edge. Sulfur K-edge X-ray absorption near edge structure (XANES) spectroscopy indicates that photochemical reaction of S-CH$$_{3}$$ with atmospheric O$$_{2}$$ forms selectively oxidized products such as -S(O)CH$$_{3}$$ and -SO$$_{3}$$$$^{-}$$ bound to the (PA) backbone. Using the correlation between the oxidation states of sulfur and the XANES peak positions, the partial charge distribution of CH$$_{3}$$S$$^{delta+}$$ -PA$$^{delta-}$$ has been estimated. The results can provide some strategy for area-selective and controllable doping processes of atomic-scale molecular systems with the assistance of UV light.

Journal Articles

Design and control of interface reaction between Al-based dielectrics and AlGaN Layer in AlGaN/GaN metal-oxide-semiconductor structures

Watanabe, Kenta*; Nozaki, Mikito*; Yamada, Takahiro*; Nakazawa, Satoshi*; Anda, Yoshiharu*; Ishida, Masahiro*; Ueda, Tetsuzo*; Yoshigoe, Akitaka; Hosoi, Takuji*; Shimura, Takayoshi*; et al.

Applied Physics Letters, 111(4), p.042102_1 - 042102_5, 2017/07

 Times Cited Count:14 Percentile:21.59(Physics, Applied)

AlGaN/GaN HFET (hetero-junction field-effect transitor) has gained much attention as next-generation high frequency and high power devices. In this study, we systematically investigated the interface reaction between Al-based dielectrics (Al$$_{2}$$O$$_{3}$$ and AlON) and AlGaN layer during deposition and post-deposition annealing (PDA), and revealed high thermal stability of AlON/AlGaN interface.

Journal Articles

Fabrication and magnetic control of Y$$_3$$Fe$$_5$$O$$_{12}$$ cantilevers

Seo, Y.-J.*; Harii, Kazuya; Takahashi, Ryo*; Chudo, Hiroyuki; Oyanagi, Koichi*; Qiu, Z.*; Ono, Takahito*; Shiomi, Yuki*; Saito, Eiji

Applied Physics Letters, 110(13), p.132409_1 - 132409_4, 2017/03

 Times Cited Count:11 Percentile:28.25(Physics, Applied)

We have fabricated ferrite cantilevers in which their vibrational properties can be controlled by external magnetic fields. Submicron-scale cantilever structures were made from Y$$_3$$Fe$$_5$$O$$_{12}$$ films by physical etching combined with the use of a focused ion beam milling technique. We found that the cantilevers exhibit two resonance modes which correspond to horizontal and vertical vibrations. Under external magnetic fields, the resonance frequency of the horizontal mode increases, while that of the vertical mode decreases, quantitatively consistent with our numerical simulation for magnetic forces. The changes in resonance frequencies with magnetic fields reach a few percent, showing that an efficient magnetic control of resonance frequencies was achieved.

Journal Articles

Gyroscopic $$g$$ factor of rare earth metals

Ogata, Yudai; Chudo, Hiroyuki; Ono, Masao; Harii, Kazuya; Matsuo, Mamoru; Maekawa, Sadamichi; Saito, Eiji

Applied Physics Letters, 110(7), p.072409_1 - 072409_4, 2017/02

 Times Cited Count:9 Percentile:42.99(Physics, Applied)

Journal Articles

Gamma radiation resistance of spin Seebeck devices

Yagmur, A.*; Uchida, Kenichi*; Ihara, Kazuki*; Ioka, Ikuo; Kikkawa, Takashi*; Ono, Madoka*; Endo, Junichi*; Kashiwagi, Kimiaki*; Nakashima, Tetsuya*; Kirihara, Akihiro*; et al.

Applied Physics Letters, 109(24), p.243902_1 - 243902_4, 2016/12

 Times Cited Count:0 Percentile:100(Physics, Applied)

Thermoelectric devices based on the spin Seebeck effect (SSE) were irradiated with gamma ($$gamma$$) rays with the total dose of around 3$$times$$10$$^{5}$$ Gy in order to investigate the $$gamma$$-radiation resistance of the devices. To demonstrate this, Pt/Ni$$_{0.2}$$Zn$$_{0.3}$$Fe$$_{2.5}$$O$$_{4}$$/Glass and Pt/Bi$$_{0.1}$$Y$$_{2.9}$$Fe$$_{5}$$O$$_{12}$$/Gd$$_{3}$$Ga$$_{5}$$O$$_{12}$$ SSE devices were used. We confirmed that the thermoelectric, magnetic, and structural properties of the SSE devices are not affected by the $$gamma$$-ray irradiation. This result demonstrates that SSE devices are applicable to thermoelectric generation even in high radiation environments.

Journal Articles

Spin-current-driven thermoelectric generation based on interfacial spin-orbit coupling

Yagmur, A.*; Karube, Shutaro*; Uchida, Kenichi*; Kondo, Kota*; Iguchi, Ryo*; Kikkawa, Takashi*; Otani, Yoshichika*; Saito, Eiji

Applied Physics Letters, 108(24), p.242409_1 - 242409_4, 2016/06

 Times Cited Count:1 Percentile:91.67(Physics, Applied)

Journal Articles

Dynamics of spallation during femtosecond laser ablation studied by time-resolved reflectivity with double pump pulses

Kumada, Takayuki; Otobe, Tomohito; Nishikino, Masaharu; Hasegawa, Noboru; Hayashi, Terutake*

Applied Physics Letters, 108(1), p.011102_1 - 011102_4, 2016/01

AA2015-0725.pdf:1.07MB

 Times Cited Count:7 Percentile:50.1(Physics, Applied)

The dynamics of photomechanical spallation during femtosecond laser ablation of fused silica was studied by time-resolved reflectivity with double pump pulses. Oscillation of reflectivity was caused by interference between the probe pulses reflected at the sample surface and the spallation layer, and was enhanced when the surface is irradiated with the second pump pulse within a time interval of several picoseconds after the first pump pulse. However, as the time-interval was increased, the oscillation amplitude decreased with an exponential decay time of 10 ps. The oscillation disappeared when the interval exceeded 20 ps. This result suggests that the formation time of the spallation layer is approximately 10 ps.

Journal Articles

Anomalous lattice deformation in GaN/SiC(0001) measured by high-speed ${{it in situ}}$ synchrotron X-ray diffraction

Sasaki, Takuo; Ishikawa, Fumitaro*; Takahashi, Masamitsu

Applied Physics Letters, 108(1), p.012102_1 - 012102_5, 2016/01

AA2015-0769.pdf:2.43MB

 Times Cited Count:1 Percentile:91.67(Physics, Applied)

Journal Articles

Activation and control of visible single defects in 4H-, 6H-, and 3C-SiC by oxidation

Lohrmann, A.*; Castelletto, S.*; Klein, J. R.*; Oshima, Takeshi; Bosi, M.*; Negri, M.*; Lau, D. W. M.*; Gibson, B. C.*; Prawer, S.*; McCallum, J. C.*; et al.

Applied Physics Letters, 108(2), p.021107_1 - 021107_4, 2016/01

 Times Cited Count:22 Percentile:16.51(Physics, Applied)

Journal Articles

Enhanced inverse spin Hall contribution at high microwave power levels in La$$_{0.67}$$Sr$$_{0.33}$$MnO$$_3$$/SrRuO$$_3$$ epitaxial bilayers

Haidar, S. M.*; Shiomi, Yuki*; Lustikova, J.*; Saito, Eiji

Applied Physics Letters, 107(15), p.152408_1 - 152408_5, 2015/10

 Times Cited Count:5 Percentile:67.53(Physics, Applied)

Journal Articles

Temporal behavior of unresolved transition array emission in water window soft X-ray spectral region from multiply charged ions

Dinh, T.-H.*; Suzuki, Yuhei*; Arai, Goki*; Li, B.*; Dunne, P.*; O'Sullivan, G.*; Fujioka, Shinsuke*; Hasegawa, Noboru; Kawachi, Tetsuya; Nishikino, Masaharu; et al.

Applied Physics Letters, 107(12), p.121101_1 - 121101_5, 2015/09

 Times Cited Count:4 Percentile:73.21(Physics, Applied)

Journal Articles

Observation of inverse spin Hall effect in ferromagnetic FePt alloys using spin Seebeck effect

Seki, Takeshi*; Uchida, Kenichi*; Kikkawa, Takashi*; Qiu, Z.*; Saito, Eiji; Takanashi, Koki*

Applied Physics Letters, 107(9), p.092401_1 - 092401_4, 2015/08

 Times Cited Count:22 Percentile:20.9(Physics, Applied)

Journal Articles

Non-thermal effects on femtosecond laser ablation of polymers extracted from the oscillation of time-resolved reflectivity

Kumada, Takayuki; Akagi, Hiroshi; Itakura, Ryuji; Otobe, Tomohito; Nishikino, Masaharu; Yokoyama, Atsushi

Applied Physics Letters, 106(22), p.221605_1 - 221605_5, 2015/06

 Times Cited Count:3 Percentile:79.6(Physics, Applied)

The dynamics of femtosecond laser ablation of transparent polymers were examined using time-resolved reflectivity. When these polymers were irradiated by a pump pulse with fluence above the ablation threshold of 0.8-2.0 J/cm$$^{2}$$, we observed the oscillation of the reflectivity caused by the interference between the reflected probe pulses from the sample surface and the thin layer due to the non-thermal photomechanical effects of spallation. As the fluence of the pump pulse increased, the separation velocity of the thin layer increased from 6 km/s to an asymptotic value of 11 km/s. It is suggested that the velocities are determined by shock-wave velocities of the photo-excited layer.

153 (Records 1-20 displayed on this page)