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Teruya Shinjo - One of the best experts on this subject based on the ideXlab platform.
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effect of joule heating in current driven domain wall motion
Applied Physics Letters, 2005Co-Authors: Akinobu Yamaguchi, S Nasu, H Tanigawa, Teruo Ono, K Miyake, Ko Mibu, Teruya ShinjoAbstract:It was found that high current density needed for the current-driven domain wall motion results in the Joule heating of the Sample. The Sample Temperature, when the current-driven domain wall motion occurred, was estimated by measuring the Sample resistance during the application of a pulsed current. The Sample Temperature was 750 K for the threshold current density of 6.7×1011A∕m2 in a 10-nm-thick Ni81Fe19 wire with a width of 240 nm on thermally oxidized silicon substrate. The Temperature was raised to 830 K for the current density of 7.5×1011A∕m2, which is very close to the Curie Temperature of bulk Ni81Fe19. When the current density exceeded 7.5×1011A∕m2, an appearance of a multidomain structure in the wire was observed by magnetic force microscopy, suggesting that the Sample Temperature exceeded the Curie Temperature.
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effect of joule heating in current driven domain wall motion
arXiv: Materials Science, 2004Co-Authors: Akinobu Yamaguchi, S Nasu, H Tanigawa, Teruo Ono, K Miyake, Ko Mibu, Teruya ShinjoAbstract:It was found that high current density needed for the current-driven domain wall motion results in the Joule heating of the Sample. The Sample Temperature, when the current-driven domain wall motion occurred, was estimated by measuring the Sample resistance during the application of a pulsed-current. The Sample Temperature was 750 K for the threshold current density of 6.7 x 10^11 A/m2 in a 10 nm-thick Ni81Fe19 wire with a width of 240 nm. The Temperature was raised to 830 K for the current density of 7.5 x 10^11 A/m2, which is very close to the Curie Temperature of bulk Ni81Fe19. When the current density exceeded 7.5 x 10^11 A/m2, an appearance of a multi-domain structure in the wire was observed by magnetic force microscopy, suggesting that the Sample Temperature exceeded the Curie Temperature.
Akinobu Yamaguchi - One of the best experts on this subject based on the ideXlab platform.
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effect of joule heating in current driven domain wall motion
Applied Physics Letters, 2005Co-Authors: Akinobu Yamaguchi, S Nasu, H Tanigawa, Teruo Ono, K Miyake, Ko Mibu, Teruya ShinjoAbstract:It was found that high current density needed for the current-driven domain wall motion results in the Joule heating of the Sample. The Sample Temperature, when the current-driven domain wall motion occurred, was estimated by measuring the Sample resistance during the application of a pulsed current. The Sample Temperature was 750 K for the threshold current density of 6.7×1011A∕m2 in a 10-nm-thick Ni81Fe19 wire with a width of 240 nm on thermally oxidized silicon substrate. The Temperature was raised to 830 K for the current density of 7.5×1011A∕m2, which is very close to the Curie Temperature of bulk Ni81Fe19. When the current density exceeded 7.5×1011A∕m2, an appearance of a multidomain structure in the wire was observed by magnetic force microscopy, suggesting that the Sample Temperature exceeded the Curie Temperature.
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effect of joule heating in current driven domain wall motion
arXiv: Materials Science, 2004Co-Authors: Akinobu Yamaguchi, S Nasu, H Tanigawa, Teruo Ono, K Miyake, Ko Mibu, Teruya ShinjoAbstract:It was found that high current density needed for the current-driven domain wall motion results in the Joule heating of the Sample. The Sample Temperature, when the current-driven domain wall motion occurred, was estimated by measuring the Sample resistance during the application of a pulsed-current. The Sample Temperature was 750 K for the threshold current density of 6.7 x 10^11 A/m2 in a 10 nm-thick Ni81Fe19 wire with a width of 240 nm. The Temperature was raised to 830 K for the current density of 7.5 x 10^11 A/m2, which is very close to the Curie Temperature of bulk Ni81Fe19. When the current density exceeded 7.5 x 10^11 A/m2, an appearance of a multi-domain structure in the wire was observed by magnetic force microscopy, suggesting that the Sample Temperature exceeded the Curie Temperature.
Toshimichi Fujiwara - One of the best experts on this subject based on the ideXlab platform.
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helium cooling and spinning dynamic nuclear polarization for sensitivity enhanced solid state nmr at 14 t and 30 k
Journal of Magnetic Resonance, 2012Co-Authors: Yoh Matsuki, Keisuke Ueda, T Idehara, R Ikeda, I Ogawa, Shinji Nakamura, Mitsuru Toda, Takahiro Anai, Toshimichi FujiwaraAbstract:Abstract We describe a 1 H polarization enhancement via dynamic nuclear polarization (DNP) at very low Sample Temperature T ≈ 30 K under magic-angle spinning (MAS) conditions for sensitivity-enhanced solid-state NMR measurement. Experiments were conducted at a high external field strength of 14.1 T. For MAS DNP experiments at T ≪ 90 K, a new probe system using cold helium gas for both Sample-cooling and -spinning was developed. The novel system can sustain a low Sample Temperature between 30 and 90 K for a period of time >10 h under MAS at ν R ≈ 3 kHz with liquid He consumption of ≈6 L/h. As a microwave source, we employed a high-power, continuously frequency-tunable gyrotron. At T ≈ 34 K, 1 H DNP enhancement factors of 47 and 23 were observed with and without MAS, respectively. On the basis of these observations, a discussion on the total NMR sensitivity that takes into account the effect of Sample Temperature and external field strength used in DNP experiments is presented. It was determined that the use of low Sample Temperature and high external field is generally rewarding for the total sensitivity, in spite of the slower polarization buildup at lower Temperature and lower DNP efficiency at higher field. These findings highlight the potential of the current continuous-wave DNP technique also at very high field conditions suitable to analyze large and complex systems, such as biological macromolecules.
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helium cooling and spinning dynamic nuclear polarization for sensitivity enhanced solid state nmr at 14 t and 30 k
Journal of Magnetic Resonance, 2012Co-Authors: Yoh Matsuki, Keisuke Ueda, T Idehara, R Ikeda, I Ogawa, Shinji Nakamura, Mitsuru Toda, Takahiro Anai, Toshimichi FujiwaraAbstract:We describe a (1)H polarization enhancement via dynamic nuclear polarization (DNP) at very low Sample Temperature T≈30 K under magic-angle spinning (MAS) conditions for sensitivity-enhanced solid-state NMR measurement. Experiments were conducted at a high external field strength of 14.1 T. For MAS DNP experiments at T 10 h under MAS at ν(R)≈3 kHz with liquid He consumption of ≈6 L/h. As a microwave source, we employed a high-power, continuously frequency-tunable gyrotron. At T≈34 K, (1)H DNP enhancement factors of 47 and 23 were observed with and without MAS, respectively. On the basis of these observations, a discussion on the total NMR sensitivity that takes into account the effect of Sample Temperature and external field strength used in DNP experiments is presented. It was determined that the use of low Sample Temperature and high external field is generally rewarding for the total sensitivity, in spite of the slower polarization buildup at lower Temperature and lower DNP efficiency at higher field. These findings highlight the potential of the current continuous-wave DNP technique also at very high field conditions suitable to analyze large and complex systems, such as biological macromolecules.
H Tanigawa - One of the best experts on this subject based on the ideXlab platform.
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effect of joule heating in current driven domain wall motion
Applied Physics Letters, 2005Co-Authors: Akinobu Yamaguchi, S Nasu, H Tanigawa, Teruo Ono, K Miyake, Ko Mibu, Teruya ShinjoAbstract:It was found that high current density needed for the current-driven domain wall motion results in the Joule heating of the Sample. The Sample Temperature, when the current-driven domain wall motion occurred, was estimated by measuring the Sample resistance during the application of a pulsed current. The Sample Temperature was 750 K for the threshold current density of 6.7×1011A∕m2 in a 10-nm-thick Ni81Fe19 wire with a width of 240 nm on thermally oxidized silicon substrate. The Temperature was raised to 830 K for the current density of 7.5×1011A∕m2, which is very close to the Curie Temperature of bulk Ni81Fe19. When the current density exceeded 7.5×1011A∕m2, an appearance of a multidomain structure in the wire was observed by magnetic force microscopy, suggesting that the Sample Temperature exceeded the Curie Temperature.
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effect of joule heating in current driven domain wall motion
arXiv: Materials Science, 2004Co-Authors: Akinobu Yamaguchi, S Nasu, H Tanigawa, Teruo Ono, K Miyake, Ko Mibu, Teruya ShinjoAbstract:It was found that high current density needed for the current-driven domain wall motion results in the Joule heating of the Sample. The Sample Temperature, when the current-driven domain wall motion occurred, was estimated by measuring the Sample resistance during the application of a pulsed-current. The Sample Temperature was 750 K for the threshold current density of 6.7 x 10^11 A/m2 in a 10 nm-thick Ni81Fe19 wire with a width of 240 nm. The Temperature was raised to 830 K for the current density of 7.5 x 10^11 A/m2, which is very close to the Curie Temperature of bulk Ni81Fe19. When the current density exceeded 7.5 x 10^11 A/m2, an appearance of a multi-domain structure in the wire was observed by magnetic force microscopy, suggesting that the Sample Temperature exceeded the Curie Temperature.
Ko Mibu - One of the best experts on this subject based on the ideXlab platform.
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effect of joule heating in current driven domain wall motion
Applied Physics Letters, 2005Co-Authors: Akinobu Yamaguchi, S Nasu, H Tanigawa, Teruo Ono, K Miyake, Ko Mibu, Teruya ShinjoAbstract:It was found that high current density needed for the current-driven domain wall motion results in the Joule heating of the Sample. The Sample Temperature, when the current-driven domain wall motion occurred, was estimated by measuring the Sample resistance during the application of a pulsed current. The Sample Temperature was 750 K for the threshold current density of 6.7×1011A∕m2 in a 10-nm-thick Ni81Fe19 wire with a width of 240 nm on thermally oxidized silicon substrate. The Temperature was raised to 830 K for the current density of 7.5×1011A∕m2, which is very close to the Curie Temperature of bulk Ni81Fe19. When the current density exceeded 7.5×1011A∕m2, an appearance of a multidomain structure in the wire was observed by magnetic force microscopy, suggesting that the Sample Temperature exceeded the Curie Temperature.
-
effect of joule heating in current driven domain wall motion
arXiv: Materials Science, 2004Co-Authors: Akinobu Yamaguchi, S Nasu, H Tanigawa, Teruo Ono, K Miyake, Ko Mibu, Teruya ShinjoAbstract:It was found that high current density needed for the current-driven domain wall motion results in the Joule heating of the Sample. The Sample Temperature, when the current-driven domain wall motion occurred, was estimated by measuring the Sample resistance during the application of a pulsed-current. The Sample Temperature was 750 K for the threshold current density of 6.7 x 10^11 A/m2 in a 10 nm-thick Ni81Fe19 wire with a width of 240 nm. The Temperature was raised to 830 K for the current density of 7.5 x 10^11 A/m2, which is very close to the Curie Temperature of bulk Ni81Fe19. When the current density exceeded 7.5 x 10^11 A/m2, an appearance of a multi-domain structure in the wire was observed by magnetic force microscopy, suggesting that the Sample Temperature exceeded the Curie Temperature.
