ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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39.37
Displaying 1-14 of 14 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: October 15, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.37.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: October 15, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.37.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Micromagnetic analysis of dynamic magnetization process in an amorphous wire for MI sensor
    Yuji UEHARA, Atsushi FURUYA, Koichi SHIMIZU, Jun FUJISAKI, Tadashi ATA ...
    Article type: Article
    Session ID: MR2015-15
    Published: October 15, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.37.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Magnetoimpedance (MI) sensors with ultrahigh sensitivity have been studied for application to wearable computers and medical devices . To realize these applications, it is of prime importance to analyze dynamic magnetization process in amorphous wires. In this paper, we introduce micromagnetic analysis of dynamic magnetization process in an amorphous wire by using the Landau-Lifshitz-Gilbert (LLG) equation taking into account the eddy current field derived from Maxwell's equations. The simulation results are in good agreement with the experimental results.
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  • Detection of the spin current assisted effect using the giant magneto-resistance effect
    Mao TAKAHASHI, Yukio NOZAKI
    Article type: Article
    Session ID: MR2015-16
    Published: October 15, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.37.0_7
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We demonstrate a reduction of coercive field in Ni_<81>Fe_<19> films using a spin transfer torque generated by a spin pumping effect. When a microwave field resonates one of the ferromagnetic layer of a pseudo spin valve consisting of Ni_<81>Fe_<19> 100 nm/Cu 10 nm/Ni_<81>Fe_<19> 10 nm trilayer, a spin current is generated by the spin pumping effect. The spin current is injected to another ferromagnetic layer and the subsequent spin transfer torque can modulate the coercive field of the ferromagnetic layer. The coercive fields of two ferromagnetic layers are measured using the giant magneto-resistance (GMR) effect as a function of microwave frequency. From the frequency dependence of the coercive field, it is confirmed that the coercive field of Ni_<81>Fe_<19> 10 nm layer becomes minimum at the frequency where a ferromagnetic resonance is excited in another Ni_<81>Fe_<19> 100 nm layer. This is the clear evidence that the spin transfer torque generated by the spin pumping effect can assist the magnetization reversal of ferromagnetic thin film in the spin valve structure.
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  • Anisotropic Magnetoresistance and Anomalous Hall Effects of pseudo single crystal Fe_4N thin films
    Masakiyo TSUNODA, Kazuki KABARA, Satoshi KOKADO
    Article type: Article
    Session ID: MR2015-17
    Published: October 15, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.37.0_11
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Fe_4N, a ferromagnetic inverse-perovskite-type transition-metal nitride with Curie temperature of 761 K, has attracted many attentions for its novel magneto-transport properties, originated from electron orbital hybridization between Fe and N atoms, and for its potential applications for spintronics as a highly spin-polarized material. In this talk, anomalous behaviors are reported for anisotropic magnetoresistance and anomalous Hall effects of pseudo single crystal Fe_4N thin films. We discuss the origin of these anomalous behaviors observed below 50 K through the analysis based on the electronic scattering theory.
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  • State-of-the-art of Holographic Data Storage
    Osamu MATOBA
    Article type: Article
    Session ID: MMS2015-41
    Published: October 15, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.37.0_15
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Holographic data storage is expected to be a next-generation optical disc memory. State-of-the-art holographic data storage is reviewed. We also present a method to increase the number of multiplexed holograms in reflection-type holographic memory using a speckle shift multiplexing.
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  • Data input and output method for three dimensional array of magnetic bit with magnetic force microscopy
    Keisuke IWAKI, Ryouki WAKASA, Hikaru NOMURA, Ryoichi Nakatani
    Article type: Article
    Session ID: MR2015-18
    Published: October 15, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.37.0_19
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A magnetic quantum cellular automata (MQCA) is one of a promised candidate for future ultra-low power devices. Recently, the research for MQCA is shifted from two dimensional MQCA to three dimensional MQCA. To accelerate basic researches of 3D-MQCA, it is necessary to develop a digital information input method. Here, we propose and demonstrate magnetization manipulation method for 3D-MQCA with magnetic force microscopy. With this method, we can manipulate an individual magnetic layer of nano-dots. This method will accelerate basic researches of magnetic devices with magnetic multilayer such as 3D-MQCA.
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  • Numerical simulation on spin wave dynamics in exchange coupled magnetic layers
    Xiaorui YA, Kenta IMAMURA, Terumitsu TANAKA, Kimihide MATSUYAMA
    Article type: Article
    Session ID: MR2015-19
    Published: October 15, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.37.0_23
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Geometrically confined two dimensional standing spin waves excited in exchange-coupled hard/soft bilayer strips have been systematically investigated by micromagnetic simulation. Resonance frequency of the standing spin wave was found to be tunable in a wide frequency range by adjusting the thickness ratio of the hard and soft layers. The dependence of the resonance frequency on various structural and material parameters has been systematically investigated.
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  • Calculation of microwave-assisted magnetization reversals and magnetization thermal stability
    Terumitsu TANAKA, Yukio NOZAKI, Kimihide MATSUYAMA
    Article type: Article
    Session ID: MR2015-20
    Published: October 15, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.37.0_27
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Microwave-assisted magnetization reversal characteristics estimated by experiments and micromagnetic simulations are compared through the Sharrock's theory taking a mono-layered CoPt type granular medium. Energy barrier height reduction evaluated by the switching fields under the microwave assistance which is estimated by the micromagnetic simulation were taken account for the magnetization after effects expressed by the Sharrock's equation. In the experiment, switching field reduction due to microwave-assistance is not observed in a lower frequency region. The reason is clarified that the switching fields are mainly affected by magnetization after effects in the frequency region although microwave slightly assists magnetization reversals. Discrepancy in the switching fields estimated by the experiment and micromagnetic simulation combined with Sharrock's equation comes from that the optimum microwave frequency in the experiment corresponds to the unstable switching frequency region for the micromagnetic simulation and assisting energy is excessively estimated in the calculation. In order to account for the switching fields for the experiment by calculation, nonlinear relation between assisting energy and reverse DC fields should be involved in the calculation.
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  • Optical disc discrimination method
    Hironori NAKAHARA, Nobuo TAKESHITA
    Article type: Article
    Session ID: MMS2015-42
    Published: October 15, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.37.0_33
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We propose a method for identifying the type of a disc inserted into an optical drive. The disc is irradiated with light from an LED light source and the diffracted light from the information recording layer of the disc is detected by using the movement of the disc during disc loading. Results of the optical simulation agree well with the experimental results. A total of 61 discs were measured, and it was confirmed that these discs can be distinguished accurately.
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  • Magnetic Device Analysis by Spin-Polarized Scanning Electron Microscopy : Microscopic Magnetization Measurements using Spin Polarization of Electrons
    Teruo Kohashi
    Article type: Article
    Session ID: MR2015-21
    Published: October 15, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.37.0_37
    CONFERENCE PROCEEDINGS FREE ACCESS
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    Spin-Polarized Scanning Electron Microscopy (Spin SEM) is one way for observing magnetic domain structures taking advantage of the spin polarization of the secondary electrons emitted from a ferromagnetic sample. This principle brings us several excellent capabilities such as high-spatial resolution better than 10 nm, and analysis of magnetization direction in three dimensions. In this paper, the principle and the structure of the spin SEM is briefly introduced, and some examples of the spin SEM measurements are shown.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: October 15, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.37.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Appendix
    Pages App2-
    Published: October 15, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.37.0_App2
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Appendix
    Pages App3-
    Published: October 15, 2015
    Released on J-STAGE: September 22, 2017
    DOIhttps://doi.org/10.11485/itetr.39.37.0_App3
    CONFERENCE PROCEEDINGS FREE ACCESS
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