研究等業績 - 原著論文 - 吉村　哲

High magnetization Co-GdOx superparamagnetic granular films as magnetic coating materials for high-sensitivity alternating magnetic force microscopy tip

Yongze Cao, Pawan Kumar, Yue Zhao, Yudai Suzuki, Satoru Yoshimura, Hitoshi Saito

Journal of Magnetism and Magnetic Materials ( Journal of Magnetism and Magnetic Materials )  462   119 - 126   2018年09月  [査読有り]

研究論文（学術雑誌）   国内共著

DOI

Fabrication of high-qualified (Bi1-xBax)FeO3 multiferroic thin films by using a pulsed DC reactive sputtering method and demonstration of magnetization reversal by electric field

Satoru Yoshimura, Munusamy Kuppan

Japanese Journal of Applied Physics ( Japanese Journal of Applied Physics )  57 ( 9 )   2018年09月  [査読有り]

研究論文（学術雑誌）   国内共著

DOI

Magnetic energy flow imaging of magnetic recording head with enhanced resolution and sensitivity by A-MFM using high magnetic moment superparamagnetic tip

Pawan Kumar, Yongze Cao, Yudai Suzuki, Satoru Yoshimura, and Hitoshi Saito

Journal of Applied Physics ( Journal of Applied Physics )  123 ( 21 ) 214503   2018年06月  [査読有り]

研究論文（学術雑誌）   国内共著

DOI

Magnetic domain imaging of a very rough fractured surface of Sr ferrite magnet without topographic crosstalk by alternating magnetic force microscopy with a sensitive FeCo-GdOx superparamagnetic tip

Yongze Cao, Yue Zhao, Pawan Kumar, Satoru Yoshimura, and Hitoshi Saito

Journal of Applied Physics ( Journal of Applied Physics )  123 ( 22 ) 224503   2018年06月  [査読有り]

研究論文（学術雑誌）   国内共著

DOI

Active magnetic force microscopy of Sr-ferrite magnet by stimulating magnetization under an AC magnetic field: Direct observation of reversible and irreversible magnetization processes

Yongze Cao, Pawan Kumar, Yue Zhao, Satoru Yoshimura, and Hitoshi Saito

Applied Physics Letters ( Applied Physics Letters )  112 ( 22 ) 223103   2018年05月  [査読有り]

研究論文（学術雑誌）   国内共著

DOI

Magnetic domain structure imaging near sample surface with alternating magnetic force microscopy by using AC magnetic field modulated superparamagnetic tip

Yongze Cao, Shota Nakayama, Pawan Kumar, Yue Zhao, Yukinori Kinoshita, Satoru Yoshimura, Hitoshi Saito

Nanotechnology ( Nanotechnology )  29 ( 30 ) 305502   2018年05月  [査読有り]

研究論文（学術雑誌）   国内共著

DOI

Basic Study of Electric Field Induced Magnetization Reversal of Multiferroic (Bi1-xBax)FeO₃ Thin Films at Room Temperature for Magnetic Recording Technology

Satoru Yoshimura, Yusuke Sugawara, Genta Egawa, and Hitoshi Saito

Journal of the Magnetic Society of Japan ( 公益社団法人 日本磁気学会 )  42 ( 2 ) 11 - 14   2018年02月  [査読有り]

研究論文（学術雑誌）   国内共著

<p>  (Bi_1-xBa_x)FeO₃ multiferroic thin films with ferromagnetism and ferroelectricity were fabricated and applied to create magnetic recordings using an electric field. The (001)-oriented (Bi_1-xBa_x)FeO₃ thin films of which electric polarization direction is perpendicular to the film plane were fabricated onto a non-single-crystalline substrate with a Ta seedlayer / (111)-oriented Pt underlayer at a low substrate temperature of 500 ℃. A very high frequency plasma irradiation was applied during sputtering deposition of (Bi_1-xBa_x)FeO₃ to accelerate the crystallization at the low substrate temperature. The fabricated (Bi_0.6Ba_0.4)FeO₃ film exhibited hysteresis curves indicating ferromagnetic and ferroelectric behavior. The saturation magnetization of the film was approximately 60 emu/cm³ and the coercivity was approximately 2.5 kOe, respectively. Magnetic Force Microscopy analysis of the (Bi_0.6Ba_0.4)FeO₃ film confirmed that the magnetization was reversed by applying only a local electric field. The multiferroic film described here is expected to be useful for electric field-driven magnetic devices.</p>

DOI CiNii Research

AC Magnetic Field Imaging of Perpendicular Magnetic Write Head without Image Distortion on Alternating Magnetic Force Microscopy using a Cone-Shape FePt-coated Tip

Satoru Yoshimura, Fu Zheng, Shinya Yasui, Genta Egawa, and Hitoshi Saito

Journal of the Magnetic Society of Japan ( 公益社団法人 日本磁気学会 )  42 ( 1 ) 5 - 10   2018年01月  [査読有り]

研究論文（学術雑誌）   国内共著

<p>  The AC magnetic field of a perpendicular magnetic write head having three surrounding shields was successfully imaged without image distortion on our alternating magnetic force microscope (A-MFM) using a newly developed cone-shape Si tip coated with an <i>L</i>1₀-FePt film. In contrast, a conventional quadrangular pyramidal Si tip coated with the <i>L</i>1₀-FePt film showed a distortion of the AC magnetic field image for the same magnetic write head. The image distortion depended on the spatial configuration between the tip and the write head. It is concluded that a round magnetic symmetry of the cone-shape FePt-coated tip is most effective for taking a clear AC magnetic field image of the perpendicular magnetic write head having three surrounding shields without distortion.</p>

DOI CiNii Research

Magnetic resonance force microscopy using ferromagnetic resonance of a magnetic tip excited by microwave transmission via a coaxial resonator

Yukinori Kinoshita, Yan Jun Li, Satoru Yoshimura, Hitoshi Saito, and Yasuhiro Sugawara

Nanotechnology ( Nanotechnology )  28 ( 48 ) 485709   2017年11月  [査読有り]

研究論文（学術雑誌）   国内共著

DOI

High resolution magnetic field energy imaging of the magnetic recording head by A-MFM with Co-GdOx super-paramagnetic tip

Pawan Kumar, Yudai Suzuki, Yongze Cao, Satoru Yoshimura, Hitoshi Saito

Applied Physics Letters ( Applied Physics Letters )  111 ( 18 ) 183105   2017年10月  [査読有り]

研究論文（学術雑誌）   国内共著

DOI

Low-energy mechanically milled τ-phase MnAl alloys with high coercivity and magnetization

Wei Lu, Junchao Niu, Taolei Wang, Kada Xia, Zhen Xiang, Yiming Song, Hong Zhang, Satoru Yoshimura, Hitoshi Saito

Journal of Alloys and Compounds   675 ( 5 ) 163 - 167   2016年12月  [査読有り]

研究論文（学術雑誌）   国際共著

Quantitatively probing the magnetic behavior of individual nanoparticles by an AC field-modulated magnetic force microscopy

Xiang Li, Wei Lu, Yiming Song, Yuxin Wang, Aiying Chen, Biao Yan, Satoru Yoshimura, Hitoshi Saito

Scientific Reports   6   22467   2016年11月  [査読有り]

研究論文（学術雑誌）   国内共著

High temperature exchange bias effect in melt-spun Mn55Bi45 alloys

Yiming Song, Zhen Xiang, Taolei Wang, Junchao Niu, Kada Xia, Wei Lu, Hong Zhang, Yongze Cao, Satoru Yoshimura and Hitoshi Saito

Applied Physics Letters   109   112402-1 - 112402-5   2016年10月  [査読有り]

研究論文（学術雑誌）   国内共著

Exchange Springs in L10-FePt(110)/A1-FePt Bilayer Films

Y. H. Li, D. F. Zheng, H. J. Zhao, B. Du, J. Wei, S. Yoshimura, and H. Saito

IEEE TRANSACTIONS ON MAGNETICS   51 ( 11 ) 4800503   2015年10月  [査読有り]

研究論文（学術雑誌）   国内共著

Pulsed magnetic field magnetic force microscope and evaluation of magnetic properties of soft magnetic tips

Y. Zheng, S. Yoshimura, G. Egawa, F. Zheng, Y. Kinoshita and H. Saito

Journal of Physics D: Applied Physics   48   335006   2015年08月  [査読有り]

研究論文（学術雑誌）   国内共著

Magnetic force microscopy using tip magnetization modulated by ferromagnetic resonance

E. Arima, Y. Naitoh, Y. J. Li, S. Yoshimura, H. Saito, H. Nomura, R. Nakatani, and Y. Sugawara

Nanotechnology   26   125701   2015年04月  [査読有り]

研究論文（学術雑誌）   国内共著

Magnetization behaviors of Fe3O4 nanoparticles studied by frequency-modulated magnetic force microscopy

X. Li, Z. Li, D. Pan, Z. Xiang, S. Yoshimura, and H. Saito

Materials Letters   125   36 - 39   2014年12月  [査読有り]

研究論文（学術雑誌）   国内共著

Dynamic nanomagnetism characterization of individual magnetic nanoparticles by frequency-modulated magnetic force microscopy

X. Li, Z. Li, D. Pan, S. Yoshimura, and H. Saito

Applied Physics Letters   104   213106   2014年07月  [査読有り]

研究論文（学術雑誌）   国内共著

A new method: study on individual magnetic nanoparticles by frequency-modulated magnetic force microscopy

X. Li, Z. Li, D. Pan, S. Yoshimura, and H. Saito

IEEE Transactions on Magnetics   58 ( 8 ) 6500404   2014年01月  [査読有り]

研究論文（学術雑誌）   国内共著

Quantitative analysis of the magnetic domain structure in polycrystalline LaSrMnO thin films by magnetic force microscopy

Z. Li, F. Wei, S. Yoshimura, G. Li, H. Asano, H. Saito

Physical Chemistry Chemical Physics   52 ( 2 ) 628 - 633   2013年04月  [査読有り]

研究論文（学術雑誌）   国内共著