Journal of the Magnetics Society of Japan
Online ISSN : 1880-4004
Print ISSN : 0285-0192
ISSN-L : 0285-0192
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Volume 23, Issue 1_2
Displaying 201-218 of 218 articles from this issue
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Chapter 9. Novel Magnetic Phenomena
Chapter 10. Novel Scientific Instrumentation & Processing
  • Magnetic Domain Imaging with Scanning Near-field Optical Microscopy
    Valentin Kottler, Noureddine Essaidi, Yong Chen, Claude Chappert
    1999 Volume 23 Issue 1_2 Pages 706-711
    Published: January 20, 1999
    Released on J-STAGE: January 25, 2008
    DOIhttps://doi.org/10.3379/jmsjmag.23.706
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    An apparatus combining various scanning probe microscopy techniques is presented. It is dedicated to near-field magneto-optical (MO) and optical transmission imaging, and simultaneously gives topographical information. This MO scanning near-field optical microscope (SNOM), working in transmission-collection mode, measures the magneto-optical circular dichroism (MOCD) effect of the samples, using a tapered and metal-coated optical fiber probe. The performance of the apparatus is mainly determined by this fiber probe. Resolution of about 200 nm was obtained on 200 Å thick Co/Pt and CoNi/Pt multilayer samples. MOCD-SNOM imaging artifacts are presented and discussed.
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  • Magneto-optical Imaging by Scanning Near-field Optical Microscope Using Polarization Modulation Technique
    T. Ishibashi, T. Yoshida, J. Yamamoto, K. Sato, Y. Mitsuoka, K. Nakaji ...
    1999 Volume 23 Issue 1_2 Pages 712-714
    Published: January 20, 1999
    Released on J-STAGE: January 25, 2008
    DOIhttps://doi.org/10.3379/jmsjmag.23.712
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    A polarization modulation technique has been applied to a scanning near-field optical microscope (SNOM), in order to improve sensitivity and resolution of a magneto-optical (MO) imaging. Polarized light modulated by a photoelastic modulator (PEM) was introduced into a bent-type optical fiber probe operated as an AFM cantilever, and transmitted MO signals were detected using a lock-in amplifier. Ar ion laser (488 nm) was used as a light source. By using this technique. images of recorded marks on a Pt/Co disk were successfully obtained. which were written by a magnetic field modulation method with a length of 1μm and a track pitch of 1.6 μm on a multilayer of Pt (0.8 nm) / Co (0.3 nm) with thickness of 15 nm. A resolution of approximately 90 nm was obtained in the MO imaging.
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  • Nonlinear Magneto-Optical Microscopy
    V. Kirilyuk, A. Kirilyuk, Th. Rasing
    1999 Volume 23 Issue 1_2 Pages 715-717
    Published: January 20, 1999
    Released on J-STAGE: January 25, 2008
    DOIhttps://doi.org/10.3379/jmsjmag.23.715
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    We report the development of a new magnetic imaging technique: nonlinear magneto-optical microscopy. Magnetization induced second harmonic generation (MSHG) is used to image the domain structure in ultrathin CoNi/Pt films. Due to both very high magneto-optical contrast and enhanced interface sensitivity, fine details of magne-tization reversal on CoNi/Pt interfaces become visible with the MSHG imaging that are not detectable by usual magneto-optics. The problem of separating the images from different multilayer interfaces is discussed.
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  • Nondestructive Cross Evaluations of Iron-based Material by Magnetic Sensors and by Laser Speckle Interferometry
    Koji Yamada, Sinnichi Shoji, Yosinori Tanaka, Yosihito Uno, Hiroyuki T ...
    1999 Volume 23 Issue 1_2 Pages 718-720
    Published: January 20, 1999
    Released on J-STAGE: January 25, 2008
    DOIhttps://doi.org/10.3379/jmsjmag.23.718
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    Nondestructive evaluations of iron-based material (A533B) have been investigated on the leakage flux from the surface by using Hall elements, on magnetic noises, on sub-micron deformations by Ar-laser speckle interferometry and on residual stresses by X-ray diffraction. A high resolution and high sensitivity for spatial inhomogeneity observation were attained as small as 200μm for residual strains less than 0.5 %.
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  • Theoretical Study on Spin Polarization of III-V Compound Tips
    Makoto Sawamura, Tomohide Maruyama, Koichi Mukasa
    1999 Volume 23 Issue 1_2 Pages 721-723
    Published: January 20, 1999
    Released on J-STAGE: January 25, 2008
    DOIhttps://doi.org/10.3379/jmsjmag.23.721
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    We investigate spin electronic structures of GaN probes, using first principles molecular orbital calculations. It is found that at the pyramidal heads of the probes with the axes parallel to the crystallographic axes [100] and [111] in the zincblende GaN, electron spins are polarized at the lowest energy states. Nearly 8%∼16% of electrons in the valence band are spin-polarized at the proximity of the head depending upon the sort of the atom on the apex and the crystallographic axis of the probe. It is observed that spin polarizability depends on the difference of electronegativities of the elements in a compound and on a highly symmetric nanostructure of the probe. It is due to Jahn-Teller effect of the tip configuration.
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  • Theoretical study of exchange force between magnetic films
    K. Nakamura, T. Oguchi, H. Hasegawa, K. Sueoka, K. Hayakawa, K. Mukasa
    1999 Volume 23 Issue 1_2 Pages 724-726
    Published: January 20, 1999
    Released on J-STAGE: January 25, 2008
    DOIhttps://doi.org/10.3379/jmsjmag.23.724
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    We calculated the exchange force between two magnetic Fe films by first-principles calculations. It is shown that the exchange force is sensitive to the film-film separation and relative atomic site on the surface for d/a<1, where d is the distance between surfaces of the two films and a the lattice constant of bulk Fe. Based on their results, the feasibility of exchange force microscopy (EFM), which probes the exchange force between the tip and the sample, was discussed.
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  • Application of a Retarding-type Mott Analyzer to Observation of Magnetic Domains
    Y. Kuraoka, K. Sueoka, T. Iwata, K. Mukasa, R. Aihara, K. Hayakawa
    1999 Volume 23 Issue 1_2 Pages 727-729
    Published: January 20, 1999
    Released on J-STAGE: January 25, 2008
    DOIhttps://doi.org/10.3379/jmsjmag.23.727
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    We developed a retarding-type Mott analyzer, of which the figure of merit and the size were improved as compared with our previously designed analyzers. The figure of merit of the new analyzer is sufficient to be used in a spin-polarized secondary electron microscope (SP-SEM) system. Equipping a UHV-SEM system with the analyzer and a secondary electron collector, we constructed an SP-SEM system. The proper operation of the system was confirmed by observing a single Fe crystal and we got clear images of domain structures on the Fe (001) surface. We also got a magnetic domain image of a patterned permalloy thin film.
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  • Spin Resolved SXAPS for Ni
    J. Fujii, Y. Suzuki, T. Mizoguchi
    1999 Volume 23 Issue 1_2 Pages 730-732
    Published: January 20, 1999
    Released on J-STAGE: January 25, 2008
    DOIhttps://doi.org/10.3379/jmsjmag.23.730
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    The soft x-ray emission intensity from Ni(110) surface was measured by appearance potential spectroscopy with spin polarized electrons near 2p electron threshold energy. The pulse count measurements of x-ray intensity instead of ordinary SXAPS measurements with lock-in technique made it possible to obtain knowledge of effects not only the characteristic x-ray but bremsstrahlung x-ray on spectra. The spectra reveal the invalidty of ordinary APS theory based on one electron approximation for Ni.
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  • Exact Parameter Estimation of Impulse Magnetizer considering Contact Resistance
    Pill-Soo Kim
    1999 Volume 23 Issue 1_2 Pages 733-735
    Published: January 20, 1999
    Released on J-STAGE: January 25, 2008
    DOIhttps://doi.org/10.3379/jmsjmag.23.733
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    This paper describes the method for exact parameter estimation of impulse magnetizer system. As the detailed contact resistance of impulse magnetizer can be obtained, the efficient design of magnetizer which produce desired magnet will be possible using our estimation procedure. As the parameter estimation method of impulse magnetizer, two different estimation methods (a method considering contact resistance and a method using air-core test coil) are presented. The application example has been achieved using a high-voltage, middle-energy capacitor discharge impulse magnetizer and 2-pole iron-core fixture.
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  • Fabrication of Oriented Fe Nanocrystals
    B. Bian, K. Sato, T. Ohkubo, Y. Hirotsu, A. Makino
    1999 Volume 23 Issue 1_2 Pages 736-738
    Published: January 20, 1999
    Released on J-STAGE: January 25, 2008
    DOIhttps://doi.org/10.3379/jmsjmag.23.736
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    Granular thin films of oriented α-Fe nanoparticles were prepared by taking advantage of the epitaxial growth of α-Fe on <100> oriented Au "seed" nanoparticles, which were epitaxially grown on a (100) NaCl substrate. The crystallographic orientation between α-Fe and Au nanocrystals is <100>Au//<100>Fe with {010}Au//{011 }Fe. It is shown that this method can be applied to control the size and inter-particle distance of oriented Fe nanocrystals in granular films. Effects of the α-Fe particle size and inter-particle distance on the coercivity of the films have been studied.
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  • Effect of Film Thickness on Magnetic properties and Microsructure for CoCrTa Media Fabricated under the Ultra Clean Sputtering Process
    M. Takahashi, A. Kikuchi, N. Iwata, S. Yoshimura, K. K. Tham, H. Shoji
    1999 Volume 23 Issue 1_2 Pages 739-741
    Published: January 20, 1999
    Released on J-STAGE: January 25, 2008
    DOIhttps://doi.org/10.3379/jmsjmag.23.739
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    The effect of film thickness of magnetic layer on Hc for Co based thin film media prepared under ultra clean process (UC-CoCrTa) and normal process (n-CoCrTa) was discussed in connection with their microstructure. In the case of UC-CoCrTa media, the main factor for decrement in Hc for the media with the film thickness of 10∼16 nm is the thermal agitation. On the other hand, for n-CoCrTa, decrement in Hc is mainly caused by the insufficiencies in microstructure such as Cr segregated grain boundary structure and homogeneity in grains diameter.
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