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
  • 1
    Electronic Resource
    Electronic Resource
    Magnetotransport and magnetocaloric properties of La0.55Er0.05Ca0.4MnO3 (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 3798-3801 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: La0.55Er0.05Ca0.4MnO3 in bulk form was prepared both by solid-state reaction and by a sol–gel method. Samples prepared by both methods showed a moderate magnetic entropy change near its Curie temperature, this spread to a large temperature span upon the application of a magnetic field of 1.8 T. The material prepared by the sol–gel method exhibits a large magnetoresistance below its Curie temperature, which is considered to result from the interfacial spin-dependent tunneling. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368558
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Exchange-coupling interaction in nanocomposite SrFe12O19/γ-Fe2O3 permanent ferrites (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 92 (2002), S. 1028-1032 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanocomposite SrFe12O19/γ-Fe2O3 permanent ferrites have been prepared by the sol-gel method and their structure and magnetic properties have been analyzed by x-ray diffraction, transmission electron microscopy, and vibrating sample magnetometer. When thermal treatment temperature is below 800 °C, the samples pressed into a flake exhibit exchange-coupling interaction between the two nanostructured phases of γ-Fe2O3 and SrFe12O19. The flake sample treated at 800 °C produces an isotropic nanocomposite with a intrinsic coercivity of 6015 Oe, a maximum magnetization of 75.6 emu/g and a maximum energy product of 1.87 MGOe as compared with the powder sample of 6400 Oe, 75.9 emu/g, and 1.52 MGOe, respectively. The exchange-coupling interaction and the enhancement of isotropic (BH)max in nanocomposite SrFe12O19/γ-Fe2O3 permanent ferrites have been discussed. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1487908
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    C60 induced photoluminescence of a silica molecular sieve (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 2619-2621 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The optical properties of the regular, 3-nm-wide hexagonal channels of the mesoporous silica molecular sieve (MCM–41) containing C60 are reported. Besides an intensive photoluminescence response at 642 nm from confined C60, a more intensive photoluminescence at 484 nm has been observed, which is considered to result from the passivation of silica zeolite with C60. Our studies indicate that both the properties of guest and host can be modified due to the interaction at the interface of them. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118936
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Electrical properties of La0.7−xPrxSr0.3MnO3 perovskite (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 70 (1997), S. 1897-1899 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present the electrical properties of polycrystalline La0.7−xPrxSr0.3MnO3 in which the average ionic radius of the A site 〈rA〉 is systematically varied while keeping the carrier concentration fixed. Below the Curie temperature Tc, the spin-disorder scattering process has been regarded to play an important role in the resistivity. With decreasing 〈rA〉, the structure transition from rhombohedral to orthorhombic phase accompanied with the sharp increase in resistivity at Tc and the increase of the activation energies has been observed. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.118724
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Very intensive red light emission from C60 trapped in 13X molecular sieve (1995)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 67 (1995), S. 326-328 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Very intensive red light emission from C60 trapped in 13X molecular sieve has been observed, and it is attributed to the active forbidden transition of C60 anion due to the interaction of C60 with the sketch structure of 13X molecular sieve. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.115433
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Preparation and Magnetic Properties of Barium Hexaferrite Nanoparticles Produced by the Citrate Process (1997)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 80 (1997), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The sol-gel synthesis technique has been used to produce barium ferrite particles. Several methods such as X-ray diffractometry, transmission electron microscopy, and magnetism measurement (VSM) have been used to obtain detailed information on the crystallography and magnetic properties of the precursor and the calcined particles. The correlation of BaFe12O19 formation with the precursor properties and thermal treatment has been studied. The optimum conditions for preparing BaFe12O19 nanoparticles at a low calcining temperature are reported, and homogeneous ultrafine BaFe12O19 with almost-ideal single-domain behavior and coercive force (5950 Oe) and specific magnetization (70 emu/g) values that are similar to the theoretically predicted values is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1997.tb03264.x
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    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
  • 8
    Electronic Resource
    Electronic Resource
    Magnetization and configurational anisotropy in magnetic clusters: Monte Carlo simulation (2003)
    Springer
    The European physical journal 37 (2003), S. 177-185 
    Details
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract. Based on the Monte Carlo simulation, the magnetic properties of the clusters, e.g. magnetization, Curie temperature, hysteresis, coercivity, natural angle and energy distribution etc., have been calculated. It has been found that, for the pure ferromagnetic cluster, the T 3/2 Bloch law is well satisfied at low temperature (T 〈 0.5 T C ) and B sur is equal to 3 B bulk . Meanwhile, there are clear indications that B increases drastically with the reducing atomic number Nwhich is consistent with the experimental facts. The results have been evalucted using the Bloch exponent law in the approximate crystalline approximation. It has also been demonstrated that the size dependence of the Curie temperature can be described by finite-size scaling theory. The investigation of the hysteresis and the spin configurations in different magnetization processes reveals the existence of an easy magnetization direction and anisotropy. The thermal coercivity for the clusters with zero and finite uniaxial anisotropy matches the experimental results well. The simulated results for the natural angle and energy distribution in the clusters prove further the existence of the configurational anisotropy in the clusters. It has been discussed that the natural angle and energy distribution influence the hysteresis of a cluster.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1140/epjb/e2004-00044-x
    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...