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Taichi Goto - One of the best experts on this subject based on the ideXlab platform.
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three port logic gate using forward volume spin wave interference in a thin yttrium iron Garnet film
Scientific Reports, 2019Co-Authors: C A Ross, Taichi Goto, Kei Shimada, Takuya Yoshimoto, Bungo Iwamoto, Koji Sekiguchi, A B Granovsky, Yuichi NakamuraAbstract:We demonstrate a logic gate based on interference of forward volume spin waves (FVSWs) propagating in a 54 nm thick, 100 μm wide yttrium iron Garnet waveguide grown epitaxially on a Garnet substrate. Two FVSWs injected by coplanar waveguides were made to interfere constructively and destructively by varying their phase difference, showing an XNOR logic function. The reflected and resonant waves generated at the edges of the waveguide were suppressed using spin wave absorbers. The observed isolation ratio was 19 dB for a magnetic field of ~2.80 kOe ( = 223 kA m−1) applied perpendicular to the film. The wavelength and device length were ~8.9 μm and ~53 μm, respectively. Further, the interference state of the SWs was analyzed using three-dimensional radio frequency simulations.
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extremely flat transmission band of forward volume spin wave using gold and yttrium iron Garnet
Journal of Physics D, 2017Co-Authors: Kei Shimada, Taichi Goto, Naoki Kanazawa, Hiroyuki Takagi, Yuichi Nakamura, H Uchida, M InoueAbstract:An extremely flat transmission band for a forward volume spin wave (SW) propagating in an SW waveguide composed of yttrium iron Garnet film and SW absorbers was obtained, using the finite integration technique. Three-dimensional analysis of the calculated results showed that the transmission ripples of the SWs propagating in the waveguide were caused by SW interference, especially that due to two standing waves originating from the waveguide edge–edge and the waveguide–antenna edge. To suppress these waves, SW absorbers composed of gold film were introduced and the resultant positions and shapes were investigated precisely. Hence, an extremely flat transmission band was obtained. The results of this study have potential application in the development of one- and two-dimensional magnonic crystals for integrated SW devices.
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integration of bulk quality thin film magneto optical cerium doped yttrium iron Garnet on silicon nitride photonic substrates
Optics Express, 2014Co-Authors: Mehmet C Onbasli, Taichi Goto, Xueyin Sun, Nathalie Huynh, C A RossAbstract:Cerium substituted yttrium iron Garnet (Ce:YIG) films were grown on yttrium iron Garnet (YIG) seed layers on silicon nitride films using pulsed laser deposition. Optimal process conditions for forming Garnet films on silicon nitride are presented. Bulk or near-bulk magnetic and magneto-optical properties were observed for 160 nm thick Ce:YIG films grown at 640 °C on rapid thermal annealed 40 nm thick YIG grown at 640 °C and 2 Hz pulse rate. The effect of growth temperature and deposition rate on structural, magnetic and magneto-optical properties has been investigated.
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magneto optical properties of cerium substituted yttrium iron Garnet films with reduced thermal budget for monolithic photonic integrated circuits
Optics Express, 2012Co-Authors: Taichi Goto, Mehmet C Onbasli, C A RossAbstract:Thin films of polycrystalline cerium substituted yttrium iron Garnet (CeYIG) were grown on an yttrium iron Garnet (YIG) seed layer on Si and Si-on-insulator substrates by pulsed laser deposition, and their optical and magneto-optical properties in the near-IR region were measured. A YIG seed layer of ~30 nm thick processed by rapid thermal anneal at 800°C provided a virtual substrate to promote crystallization of the CeYIG. The effect of the thermal budget of the YIG/CeYIG growth process on the film structure, magnetic and magnetooptical properties was determined.
C A Ross - One of the best experts on this subject based on the ideXlab platform.
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three port logic gate using forward volume spin wave interference in a thin yttrium iron Garnet film
Scientific Reports, 2019Co-Authors: C A Ross, Taichi Goto, Kei Shimada, Takuya Yoshimoto, Bungo Iwamoto, Koji Sekiguchi, A B Granovsky, Yuichi NakamuraAbstract:We demonstrate a logic gate based on interference of forward volume spin waves (FVSWs) propagating in a 54 nm thick, 100 μm wide yttrium iron Garnet waveguide grown epitaxially on a Garnet substrate. Two FVSWs injected by coplanar waveguides were made to interfere constructively and destructively by varying their phase difference, showing an XNOR logic function. The reflected and resonant waves generated at the edges of the waveguide were suppressed using spin wave absorbers. The observed isolation ratio was 19 dB for a magnetic field of ~2.80 kOe ( = 223 kA m−1) applied perpendicular to the film. The wavelength and device length were ~8.9 μm and ~53 μm, respectively. Further, the interference state of the SWs was analyzed using three-dimensional radio frequency simulations.
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integration of bulk quality thin film magneto optical cerium doped yttrium iron Garnet on silicon nitride photonic substrates
Optics Express, 2014Co-Authors: Mehmet C Onbasli, Taichi Goto, Xueyin Sun, Nathalie Huynh, C A RossAbstract:Cerium substituted yttrium iron Garnet (Ce:YIG) films were grown on yttrium iron Garnet (YIG) seed layers on silicon nitride films using pulsed laser deposition. Optimal process conditions for forming Garnet films on silicon nitride are presented. Bulk or near-bulk magnetic and magneto-optical properties were observed for 160 nm thick Ce:YIG films grown at 640 °C on rapid thermal annealed 40 nm thick YIG grown at 640 °C and 2 Hz pulse rate. The effect of growth temperature and deposition rate on structural, magnetic and magneto-optical properties has been investigated.
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pulsed laser deposition of epitaxial yttrium iron Garnet films with low gilbert damping and bulk like magnetization
APL Materials, 2014Co-Authors: Mehmet C Onbasli, A V Chumak, B Hillebrands, Andreas Kehlberger, Dong Hun Kim, G Jakob, Mathias Klaui, C A RossAbstract:Yttrium iron Garnet (YIG, Y 3Fe5O12) films have been epitaxially grown on Gadolinium Gallium Garnet (GGG, Gd3Ga5O12) substrates with (100) orientation using pulsed laser deposition. The films were single-phase, epitaxial with the GGG substrate, and the root-mean-square surface roughness varied between 0.14 nm and 0.2 nm. Films with thicknesses ranging from 17 to 200 nm exhibited low coercivity (<2 Oe), near-bulk room temperature saturation moments (∼135 emu cm−3), in-plane easy axis, and damping parameters as low as 2.2 × 10−4. These high quality YIG thin films are useful in the investigation of the origins of novel magnetic phenomena and magnetization dynamics.
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magneto optical properties of cerium substituted yttrium iron Garnet films with reduced thermal budget for monolithic photonic integrated circuits
Optics Express, 2012Co-Authors: Taichi Goto, Mehmet C Onbasli, C A RossAbstract:Thin films of polycrystalline cerium substituted yttrium iron Garnet (CeYIG) were grown on an yttrium iron Garnet (YIG) seed layer on Si and Si-on-insulator substrates by pulsed laser deposition, and their optical and magneto-optical properties in the near-IR region were measured. A YIG seed layer of ~30 nm thick processed by rapid thermal anneal at 800°C provided a virtual substrate to promote crystallization of the CeYIG. The effect of the thermal budget of the YIG/CeYIG growth process on the film structure, magnetic and magnetooptical properties was determined.
A Hoffmann - One of the best experts on this subject based on the ideXlab platform.
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magnetostatic spin waves in an yttrium iron Garnet thin film comparison between theory and experiment for arbitrary field directions
Journal of Applied Physics, 2019Co-Authors: Jinho Lim, Wonbae Bang, Jonathan Trossman, Dovran Amanov, C C Tsai, Matthias Benjamin Jungfleisch, A HoffmannAbstract:Using a multielement antenna, we have performed measurements of the angular dependence of propagating magnetostatic spin waves in a thin yttrium iron Garnet film, both in-plane and out-of-plane, and compared the measurements with existing theoretical models. For most magnetic field directions, theory and experiments agree reasonably well. However, there is a range of magnetic field directions where differences between theory and experiment become large.
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magnetostatic spin waves in an yttrium iron Garnet thin film comparison between theory and experiment for arbitrary field directions
Journal of Applied Physics, 2019Co-Authors: Wonbae Bang, Jonathan Trossman, Dovran Amanov, A Hoffmann, C C Tsai, Matthias Benjamin Jungfleisch, John B KettersonAbstract:Using a multielement antenna, we have performed measurements of the angular dependence of propagating magnetostatic spin waves in a thin yttrium iron Garnet film, both in-plane and out-of-plane, and compared the measurements with existing theoretical models. For most magnetic field directions, theory and experiments agree reasonably well. However, there is a range of magnetic field directions where differences between theory and experiment become large.Using a multielement antenna, we have performed measurements of the angular dependence of propagating magnetostatic spin waves in a thin yttrium iron Garnet film, both in-plane and out-of-plane, and compared the measurements with existing theoretical models. For most magnetic field directions, theory and experiments agree reasonably well. However, there is a range of magnetic field directions where differences between theory and experiment become large.
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spin waves in micro structured yttrium iron Garnet nanometer thick films
Journal of Applied Physics, 2015Co-Authors: Matthias B Jungfleisch, J Pearson, Houchen Chang, Wei Zhang, Wanjun Jiang, Joseph Sklenar, Anand Bhattacharya, J B Ketterson, A HoffmannAbstract:We investigated the spin-wave propagation in a micro-structured yttrium iron Garnet waveguide of 40 nm thickness. Utilizing spatially-resolved Brillouin light scattering microscopy, an exponential decay of the spin-wave amplitude of (10.06 ± 0.83) μm was observed. This leads to an estimated Gilbert damping constant of α=(8.79±0.73)×10−4, which is larger than damping values obtained through ferromagnetic resonance measurements in unstructured films. The theoretically calculated spatial interference of waveguide modes was compared to the spin-wave pattern observed experimentally by means of Brillouin light scattering spectroscopy.
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spin waves in micro structured yttrium iron Garnet nanometer thick films
arXiv: Mesoscale and Nanoscale Physics, 2014Co-Authors: Matthias B Jungfleisch, J Pearson, Houchen Chang, Wei Zhang, Wanjun Jiang, Joseph Sklenar, Anand Bhattacharya, J B Ketterson, A HoffmannAbstract:We investigated the spin-wave propagation in a micro-structured yttrium iron Garnet waveguide of $40$ nm thickness. Utilizing spatially-resolved Brillouin light scattering microscopy, an exponential decay of the spin-wave amplitude of $(10.06 \pm 0.83)$ $\mu$m was observed. This leads to an estimated Gilbert damping constant of $\alpha=(8.79\pm 0.73)\times 10^{-4}$, which is larger than damping values obtained through ferromagnetic resonance measurements in unstructured films. The theoretically calculated spatial interference of waveguide modes was compared to the spin-wave pattern observed experimentally by means of Brillouin light scattering spectroscopy.
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nanometer thick yttrium iron Garnet films with extremely low damping
IEEE Magnetics Letters, 2014Co-Authors: Houchen Chang, Tao Liu, A Hoffmann, Wei Zhang, L J DengAbstract:Yttrium iron Garnet (YIG) films that are in the nanometer thickness range and show extremely low damping are reported. The films were deposited via sputtering at room temperature and were then annealed in O 2 at high temperature. A 22-nm-thick YIG film showed a Gilbert damping constant α = (8.58 ± 0.21) × 10 -5 , which represents the lowest damping ever reported for nanometer-thick magnetic films. The film had a gyromagnetic ratio of |γ| = 2.83 MHz/Oe and a saturation induction of 4π M s = 1766 G, which are both very close to those of single-crystal YIG bulk materials. The film had a very smooth surface, with an rms surface roughness of about 0.13 nm.
G Schmidt - One of the best experts on this subject based on the ideXlab platform.
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investigation of the unidirectional spin heat conveyer effect in a 200 nm thin yttrium iron Garnet film
Scientific Reports, 2016Co-Authors: O Wid, Jan Bauer, Alexander Muller, O Breitenstein, Stuart S P Parkin, G SchmidtAbstract:We have investigated the unidirectional spin wave heat conveyer effect in sub-micron thick yttrium iron Garnet (YIG) films using lock-in thermography (LIT). Although the effect is small in thin layers this technique allows us to observe asymmetric heat transport by magnons which leads to asymmetric temperature profiles differing by several mK on both sides of the exciting antenna, respectively. Comparison of Damon-Eshbach and backward volume modes shows that the unidirectional heat flow is indeed due to non-reciprocal spin-waves. Because of the finite linewidth, small asymmetries can still be observed when only the uniform mode of ferromagnetic resonance is excited. The latter is of extreme importance for example when measuring the inverse spin-Hall effect because the temperature differences can result in thermovoltages at the contacts. Because of the non-reciprocity these thermovoltages reverse their sign with a reversal of the magnetic field which is typically deemed the signature of the inverse spin-Hall voltage.
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yttrium iron Garnet thin films with very low damping obtained by recrystallization of amorphous material
Scientific Reports, 2016Co-Authors: Christoph Häuser, Tim Richter, N Homonnay, Christian Eisenschmidt, Mohammad M Qaid, Hakan Deniz, D Hesse, M Sawicki, Stefan G Ebbinghaus, G SchmidtAbstract:We have investigated recrystallization of amorphous Yttrium Iron Garnet (YIG) by annealing in oxygen atmosphere. Our findings show that well below the melting temperature the material transforms into a fully epitaxial layer with exceptional quality, both structural and magnetic. In ferromagnetic resonance (FMR) ultra low damping and extremely narrow linewidth can be observed. For a 56 nm thick layer a damping constant of α = (6.15 ± 1.50) · 10−5 is found and the linewidth at 9.6 GHz is as small as 1.30 ± 0.05 Oe which are the lowest values for PLD grown thin films reported so far. Even for a 20 nm thick layer a damping constant of α = (7.35 ± 1.40) · 10−5 is found which is the lowest value for ultrathin films published so far. The FMR linewidth in this case is 3.49 ± 0.10 Oe at 9.6 GHz. Our results not only present a method of depositing thin film YIG of unprecedented quality but also open up new options for the fabrication of thin film complex oxides or even other crystalline materials.
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investigation of the unidirectional spin heat conveyer effect in a 200nm thin yttrium iron Garnet film
arXiv: Materials Science, 2016Co-Authors: O Wid, Jan Bauer, Alexander Muller, O Breitenstein, Stuart S P Parkin, G SchmidtAbstract:We have investigated the unidirectional spin wave heat conveyer effect in sub-micron thick yttrium iron Garnet (YIG) films using lock-in thermography (LIT). Although the effect is small in thin layers this technique allows us to observe asymmetric heat transport by magnons which leads to asymmetric temperature profiles differing by several mK on both sides of the exciting antenna, respectively. Comparison of Damon-Eshbach and backward volume modes shows that the unidirectional heat flow is indeed due to non-reciprocal spin-waves. Because of the finite linewidth, small asymmetries can still be observed when only the uniform mode of ferromagnetic resonance is excited. The latter is of extreme importance for example when measuring the inverse spin-Hall effect because the temperature differences can result in thermovoltages at the contacts. Because of the non-reciprocity these thermovoltages reverse their sign with a reversal of the magnetic field which is typically deemed the signature of the inverse spin-Hall voltage.
Mehmet C Onbasli - One of the best experts on this subject based on the ideXlab platform.
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integration of bulk quality thin film magneto optical cerium doped yttrium iron Garnet on silicon nitride photonic substrates
Optics Express, 2014Co-Authors: Mehmet C Onbasli, Taichi Goto, Xueyin Sun, Nathalie Huynh, C A RossAbstract:Cerium substituted yttrium iron Garnet (Ce:YIG) films were grown on yttrium iron Garnet (YIG) seed layers on silicon nitride films using pulsed laser deposition. Optimal process conditions for forming Garnet films on silicon nitride are presented. Bulk or near-bulk magnetic and magneto-optical properties were observed for 160 nm thick Ce:YIG films grown at 640 °C on rapid thermal annealed 40 nm thick YIG grown at 640 °C and 2 Hz pulse rate. The effect of growth temperature and deposition rate on structural, magnetic and magneto-optical properties has been investigated.
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pulsed laser deposition of epitaxial yttrium iron Garnet films with low gilbert damping and bulk like magnetization
APL Materials, 2014Co-Authors: Mehmet C Onbasli, A V Chumak, B Hillebrands, Andreas Kehlberger, Dong Hun Kim, G Jakob, Mathias Klaui, C A RossAbstract:Yttrium iron Garnet (YIG, Y 3Fe5O12) films have been epitaxially grown on Gadolinium Gallium Garnet (GGG, Gd3Ga5O12) substrates with (100) orientation using pulsed laser deposition. The films were single-phase, epitaxial with the GGG substrate, and the root-mean-square surface roughness varied between 0.14 nm and 0.2 nm. Films with thicknesses ranging from 17 to 200 nm exhibited low coercivity (<2 Oe), near-bulk room temperature saturation moments (∼135 emu cm−3), in-plane easy axis, and damping parameters as low as 2.2 × 10−4. These high quality YIG thin films are useful in the investigation of the origins of novel magnetic phenomena and magnetization dynamics.
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magneto optical properties of cerium substituted yttrium iron Garnet films with reduced thermal budget for monolithic photonic integrated circuits
Optics Express, 2012Co-Authors: Taichi Goto, Mehmet C Onbasli, C A RossAbstract:Thin films of polycrystalline cerium substituted yttrium iron Garnet (CeYIG) were grown on an yttrium iron Garnet (YIG) seed layer on Si and Si-on-insulator substrates by pulsed laser deposition, and their optical and magneto-optical properties in the near-IR region were measured. A YIG seed layer of ~30 nm thick processed by rapid thermal anneal at 800°C provided a virtual substrate to promote crystallization of the CeYIG. The effect of the thermal budget of the YIG/CeYIG growth process on the film structure, magnetic and magnetooptical properties was determined.
