GLORIA

GEOMAR Library Ocean Research Information Access

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
Document type
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of MnBiDy(Sm) permanent magnetic films (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 1178-1183 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have studied crystal texturing and magnetic properties of MnBiDy(Sm) permanent magnetic films, with thicknesses varying from 60 to 1200 nm, fabricated by the thermal coevaporation method and subsequently annealed in a vacuum oven at temperatures ranging from 350–425 °C. X-ray diffraction analysis has shown that the samples exhibit low-temperature phase MnBi with a NiAs-type structure when the thicknesses of the samples are less than 250 nm. When the thicknesses are larger than 250 nm, however, the Bi3Mn2 phase also appears. Magnetic measurements have revealed that saturation magnetization σs=46–78 emu/g, residual magnetic induction Br=3.2–7.3 kGs, remnant magnetization ratio r=0.64–0.98, intrinsic coercive force Hc=2.2–7.3 kOe, and magnetic energy product (BH)m=3.33–14.3 MGOe. We have also found that Hc depends on the thickness of the sample, and reaches a maximum when the thickness d=400 nm. The origin of the coercive force may be understood by the nucleation and growth of reverse magnetic domains when d〈150 nm but by domain rotation when d(approximately-greater-than)600 nm. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358982
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Temperature dependence of structure and magnetic properties in MnBi-based alloy films (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 3878-3880 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: MnBi alloy films, which have large magnetocrystalline anisotropy and high remanence, are synthesized with small dopants of rare-earth elements (RE=Dy, Sm, or Tb) by vacuum evaporation method. In contrast with most ferromagnetic materials, the low temperature phase (LTP) of MnBi film shows a large coercivity, Hc, over an extended temperature range. The hexagonal crystal structure of MnBi LTP thus has good thermal stability. The experiments found that doping further extends the temperature range through which the LTP is stable. Moreover, MnBi-doped films still exhibit square hysteresis loops at high temperatures. We attribute the unusual temperature dependence of the coercivity to an increased perpendicular anisotropy field, Ha, with temperature. For this reason, MnBi-based alloy films have great potential as permanent magnets at high temperatures. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.371302
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    New modified Sr-ferrite particles for high density magnetic recording (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 1667-1669 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Platelike particles of SrFe12O19 with epitaxially grown Fe3O4 overlayer were prepared by a wet method. The experimental results have shown that modified sample has an exchange coupling between epitaxial layer and Sr-ferrite core. As Fe2+ quantity added, coercive force decreased and saturation magnetization increased, and these values can be controlled by changing ferrous ions ratio with respect to core material, simultaneously, reflection intensity of magnetoplumbite phase has been weaker and that of spinel phase stronger. Moreover, the variations of particle morphology changing from the hexagonal platelet of Sr-ferrite to the square platelet of Fe3O4 were observed by transmission electron microscope. The origin of coercive force decrease quickly may be understood by the nucleation and growth of reverse magnetic domains when Fe2+ content x〈0.4 wt %. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369303
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...