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  • 1
    Electronic Resource
    Electronic Resource
    Vertical bistable switching of spin vortex in a circular magnetic dot (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 6548-6549 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated switching behaviors of a spin-vortex core in circular magnetic dots to evaluate them as a new candidate for magnetic memory elements. The spin-vortex core with the lateral dimension of exchange length can take two possible states with spins around the dot center directing either up- or downward. These two spin configurations are very stable and their polarities can be switched by a large vertical field. The mean switching field reaches about 2.5 kOe for Ni80Fe20 dots with 1 μm in diameter and 80 nm in height. This result could open the way for developing a new bistable magnetic memory element utilizing the spin vortex. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1416132
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of surface free energy of underlayer materials on crystal growth of Co polycrystalline films (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6880-6883 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Crystallographic texture of polycrystalline Co films prepared by sputtering on a variety of underlayers has been investigated. The texture of polycrystalline Co films greatly depends on underlayer material, and this dependence is well explained by taking into account the surface free energy difference between the underlayer material (γu) and Co (γCo). When γu is larger than γCo, Co films can be grown with a well-defined crystallographic texture of hcp-Co(001), which is the lowest surface energy crystal plane in order to minimize the total surface energy. In contrast, if γu is much smaller than γCo, no remarkable underlayer effects can be observed in the crystallographic structure of Co films. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361510
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  • 3
    Electronic Resource
    Electronic Resource
    Magnetic-field-induced shape recovery by reverse phase transformation (2006)
    [s.l.] : Nature Publishing Group
    Nature 439 (2006), S. 957-960 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Large magnetic-field-induced strains have been observed in Heusler alloys with a body-centred cubic ordered structure and have been explained by the rearrangement of martensite structural variants due to an external magnetic field. These materials have attracted considerable attention as ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature04493
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  • 4
    Electronic Resource
    Electronic Resource
    High density recorded patterns observed by high-resolution Bitter scanning electron microscope method : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 6074-6076 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have developed a new and versatile method for observation of fine domain structures in ferromagnetic specimens. In this method, which we call here the high-resolution Bitter scanning electron microscope (HRBS) method, ferromagnetic fine particles as small as 20 nm are fabricated by sputtering, and are subsequently deposited on the surface of ferromagnetic samples to be investigated. The particles form very faithful domain patterns reflecting the leakage field distribution from the samples. We have applied this method to several magnetic and magneto-optic high density recording media, and have successfully observed the bit patterns at a recording density of 300 kFCI (bit length ∼80 nm). Moreover, we have confirmed that the HRBS method is also effective in investigating the magnetized states within each recording bit. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.362097
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  • 5
    Electronic Resource
    Electronic Resource
    Crystal structure and magnetic properties of Fe (111) singe crystal films (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 344-349 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Fe (111) single crystal films have been grown on GaAs (111) by the sputter-beam method. Reflection high energy electron diffraction and x-ray diffraction measurements have revealed excellent aligned epitaxial growth of the Fe (111) film on GaAs. No evidence of preferential diffusion of As atoms into the deposited Fe layers has been found in the depth profile of Auger electron spectra. Magnetic measurements clearly show that the Fe (111) film has nearly ideal threefold symmetric anisotropy and exhibits isotropic initial permeability in the film plane, as predicted by theory.© 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.364117
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  • 6
    Electronic Resource
    Electronic Resource
    Interlayer coupling of Fe/Si/Fe trilayers with very thin boundary layers (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5741-5743 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The interlayer magnetic coupling of a Fe/Si/Fe trilayer shows an analogous feature to that of Fe/Si superlattices. With an increase in Si layer thickness, it oscillates as ferromagnetic (first F), antiferromagnetic (AF), ferromagnetic (second F), and finally reaches a noncoupling (N) state. We have investigated interlayer coupling of Fe/Si/Fe trilayers inserting very thin (1 or 2 ML thick) boundary layers X (X=Ag, Ge, Fe–Si, Ta, etc.). They are expected to suppress interatomic diffusion between Fe and Si layers. Interlayer coupling of Fe/X/Si/X/Fe with negligible interdiffusion is simply F and changes to N as the Si layer thickness increases. Furthermore, Fe/Fe–Si/Fe trilayers which show coupling of first F, AF but not second F, reproduce second F when a Si layer is inserted in the Fe–Si spacer. These results imply that an amorphous Si spacer mediates ferromagnetic coupling between neighboring Fe layers while the first F and the strong AF coupling usually observed in Fe/Si superlattices are caused by diffused crystalline Fe–Si. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370111
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of oxygen on recording characteristics in vacuum-evaporated Co-Cr thin films (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 2908-2910 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The influence of oxygen contamination of Co-Cr thin films during evaporation was investigated by measuring their magnetic properties and recording characteristics. By increasing the amount of added oxygen, perpendicular anisotropy of Co-Cr thin films was degraded, causing an increase of the coercive force Hc and squareness ratio Mr/Ms in the longitudinal direction. In recorded signal characteristics, the addition of oxygen results in a decrease of the dipulse ratio and a degradation of the recording density response through the enhancement of recording demagnetization. In noise characteristics, it results in reverse dc erase noise response with a peak at some reverse current which is characteristic of longitudinal thin-film recording media, while the noise in the presence of signal does not show an increase with increasing recording density, which is quite different from the longitudinal thin films. Another distinctive result was that even a sample with a small amount of oxygen, where magnetic properties and recording density response were roughly the same as the samples without intentional addition of oxygen, showed a very huge dc erase noise.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340953
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  • 8
    Electronic Resource
    Electronic Resource
    Noise from underlayer of perpendicular magnetic recording medium (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3925-3927 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Noise from the underlayer is observed with a Mn-Zn ferrite head and a Co-Mo-Zr low coercivity amorphous underlayer. Three kinds of noise are observed, spike noise (s), medium noise (m), and low noise (l). s noise is generated through the domain walls of an underlayer. m noise originates from the interaction between an underlayer and the reproducing head's residual magnetization. Three effective methods are tested for reducing the noise: (1) increase of coercivity of an underlayer, (2) use of an ac-erased head, and (3) use of a thin-film head.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334918
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  • 9
    Electronic Resource
    Electronic Resource
    Effects of B and C on the ordering of L10-CoPt thin films (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 79 (2001), S. 2001-2003 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the effects of B and C on the ordering of L10-CoPt films and confirmed the following quite different role between B and C in CoPt. A small amount of B considerably decreases the temperature for ordering and is interstitially incorporated into L10-CoPt along its c axis due to the large negative heat of solutions with Co and Pt. X-ray photoelectron spectroscopy analyses have revealed that B atoms combine with Co and Pt. In contrast, C is not incorporated into the CoPt lattice due to its positive heat of solution, resulting in no decrease in the ordering temperature. The present results reveal that CoPt films containing a small amount of B are promising for high density recording media. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1408605
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  • 10
    Electronic Resource
    Electronic Resource
    Low-temperature ordering of L10–CoPt thin films promoted by Sn, Pb, Sb, and Bi additives (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 1104-1106 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied the effect of additional elements of Sn, Pb, Sb, and Bi on the ordering of L10–CoPt films. All of these additives are demonstrated to be very effective to promote the ordering and developing of a very large coercivity of the samples annealed at 400 °C. It is worth noting that this annealing temperature for ordering is 200 °C lower than that of pure CoPt. The crystallographic and chemical analyses have revealed that these additives easily diffuse and segregate onto the film surfaces by postannealing because of their very low surface free energy and extremely low solubility in Co. Therefore, it seems reasonable to conclude that the ordering in the CoPt film is significantly promoted at much lower temperature by the aid of a lot of defects produced by the additives excreted by postannealing. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1346628
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