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  • 1
    Electronic Resource
    Electronic Resource
    Magneto-transport and exchange biasing in La–Ca–Mn–O compositionally modulated ferromagnetic/antiferromagnetic multilayers (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 3926-3930 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Compositionally modulated structures consisting of La2/3Ca1/3MnO3 ferromagnetic (FM) layers and La1/3Ca2/3MnO3 antiferromagnetic (AF) layers, with layer thickness 1.5 nm ≤tFM,tAF≤6 nm, were grown on (100)LaAlO3 by pulsed laser deposition. Thermomagnetic and isothermal magnetic measurements reveal an exchange-biasing mechanism with the same blocking temperature TB(approximate)70 K for all the examined combinations of tFM and tAF. The ratio of colossal magnetoresistance increases in multilayers with larger tFM, whereas the exchange-biasing field increases in samples with larger tAF. The independence of TB on tFM and tAF shows that the artificially induced La1−xCaxMnO3 (x(approximate)0.5) compositional modulation at the interfaces is of critical importance for exchange biasing in La–Ca–Mn–O based multilayers. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372436
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  • 2
    Electronic Resource
    Electronic Resource
    Granular CoPt/C films for high-density recording media (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 4358-4361 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Granular CoPt/C films, consisting of nanoparticles of the face-centered-tetragonal (fct) CoPt phase embedded in a carbon matrix, have been made by cosputtering from CoPt and C targets using a tandem deposition mode. The as-made films have a disordered face-centered-cubic structure and low coercivity (below 100 Oe). The granular structure is obtained after an aging heat treatment, which is followed by a drastic increase in coercivity to values up to 9 kOe due to the formation of the highly anisotropic fct phase. Transmission electron microscope studies showed the size of the CoPt particles to increase from 5 nm in the as-made state to 7–12 nm in the optimally annealed state. The measured coercivities are much lower than the value expected for noninteracting, randomly distributed single-domain particles. The large discrepancy is attributed to interparticle interactions, particle-size effects, and mainly to a lower anisotropy of the fct phase because of incomplete ordering. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.373078
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  • 3
    Electronic Resource
    Electronic Resource
    New CoPt/Ag films for high density recording media (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4304-4306 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: CoPt/Ag nanocomposite films have been prepared with magnetic properties promising for potential application in high density magnetic recording media. The films were initially deposited by sputtering, in a multilayer form and found to crystallize in the magnetically soft face centered cubic phase. Annealing leads to a microstructure consisting of the magnetically hard face centered tetragonal CoPt nanoparticles embedded in a Ag matrix. Microstructure and coercivity can be tailored by adjusting the annealing conditions and the relative CoPt/Ag composition. Values of coercivity in the range of 1–17 kOe with grain sizes in the range of 7–100 nm, respectively, have been obtained. Henkel plots of optimally annealed samples show only weak interactions of dipolar nature, characteristic of magnetically isolated single domain particles. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370350
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  • 4
    Electronic Resource
    Electronic Resource
    Exchange biasing in La2/3Ca1/3MnO3/La1/3Ca2/3MnO3 multilayers (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 4913-4915 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A series of [La2/3Ca1/3MnO3/La1/3Ca2/3MnO3]15 multilayers, with bilayer thicknesses between 2 and 32 nm, has been prepared by pulsed laser deposition. The study of their magnetic and magnetotransport properties reveals, for the first time in this category of materials, the presence of an exchange biasing mechanism at low temperatures. Zero-field-cooling and field-cooling magnetic measurements reveal a blocking temperature around 70 K that is independent of the bilayer thickness, whereas the average film magnetization becomes zero at 250 K. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369140
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  • 5
    Electronic Resource
    Electronic Resource
    Magnetic and phase transformation studies in Nd15DyFe75(C,B)9 cast alloys : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4616-4618 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Previous studies have shown that high coercivities can be achieved in cast Nd–Fe–C alloys through an annealing heat treatment at 900 °C, which causes a peritectoidal transformation from Nd2Fe17Cx to Nd2Fe14Cx. We have studied the characteristics of this transformation in cast Nd15DyFe75(C,B)9 alloys. Optimum coercivities were obtained by annealing for 6 h at 900 °C. A highly faulted carbide phase was identified in samples annealed for 5 min at 900 °C. From electron diffraction investigations, this phase was identified to be hexagonal with lattice parameters, a=0.48 nm and c=0.81 nm. The development of coercivity in the various stages of transformation is related to the crystal structure and microstructure developed in the transformation. The presence of α-Fe in samples with increased Fe content leads to reduced coercivities. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361681
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic hardening of melt-spun nanocomposite Nd2Fe14B/Fe magnets : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4827-4829 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Coercivity optimization studies were done on melt-spun nanocomposite Nd4R2Fe87−xNbTxB6 (R=Nd,Y,Dy; T=Ag,Cu) isotropic ribbon samples. The maximum attainable coercivities, after adjusting the annealing time, were found to be very sensitive to the annealing temperatures. The optimum magnetic properties [HC=3.9 kOe, (BH)max=10 MGOe] were obtained by annealing at 750–775 °C for a few minutes. Optimization by flash annealing gave similar results. Microstructural studies show that the grain size is greater than the theoretically predicted grain size for optimum coupling between the hard and the soft phase. With the annealing conditions used, Nd4Dy2Fe87NbB6 samples gave moderate coercivities and in Nd4Y2Fe87NbB6 samples the coercivity was reduced more than the expected reduction in the anisotropy field due to the presence of Y. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361621
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  • 7
    Electronic Resource
    Electronic Resource
    Melt-spun Pr2Co14B/Co nanocomposite magnets : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 4837-4839 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have successfully prepared a new nanocomposite magnet consisting of a mixture of a magnetically hard Pr2Co14B phase and a soft Co phase using the technique of melt spinning. The final microstructure with the above phases is formed after annealing the melt-spun ribbons through an intermediate transformation to the metastable TbCu7-type structure. Optimum coercivity of 4.3 kOe was observed in a sample with the composition Pr8Co83Nb1B8 after heating above 775 °C. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361625
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  • 8
    Electronic Resource
    Electronic Resource
    Magnetization reversal in SmFeTi (002) textured films with the ThMn12 structure (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 1689-1692 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: SmFeTi films with the ThMn12 structure were prepared with a rf magnetron technique. The magnetization reversal mechanisms are studied by magnetization measurements. The results indicate a domain wall pinning mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.356355
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  • 9
    Electronic Resource
    Electronic Resource
    Magnetic properties of Nd(Fe,Ti)12 and Nd(Fe,Ti)12Nx films of perpendicular texture : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6232-6234 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nd(Fe,Ti)12 and Nd(Fe,Ti)12Nx films textured with c axis perpendicular to the film plane were synthesized by sputtering. For the Nd(Fe,Ti)12 films a spin reorientation took place at about 170 K. For the Nd(Fe,Ti)12Nx films, the anisotropy field is about 85 kOe at room temperature and 130 kOe at 5 K, corresponding to a coercivity of 2.7 and 12 kOe, respectively. Initial magnetization curves show a behavior characteristic of nucleation type of magnetization reversal mechanism. Attempts were made to fit the experimental data with Kronmüller's magnetization reversal model. The results suggest that nucleation with extended sites is responsible for the reversal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355408
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  • 10
    Electronic Resource
    Electronic Resource
    Optimization of CoPt/B nanocomposite films for ultrahigh-density recording media (2001)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 90 (2001), S. 3112-3114 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The microstructure and magnetic properties of nanocomposite CoPt/B films are investigated in view of their suitability as ultrahigh-density recording media. The as-made films have a disordered face-centered cubic structure and low coercivity (below 100 Oe). The granular structure is obtained after an aging heat treatment, which also leads to an increase of the coercivity due to the formation of the highly anisotropic face-centered tetragonal phase. The dynamics of the fct phase formation are found to depend on the boron content. For the sample with 50% vol boron concentration, annealing temperatures as low as 550 °C are sufficient to obtain useful coercivities. Transmission electron microscopy studies and x-ray diffraction show that minimum grain size is obtained for the 20% vol boron concentration for all temperatures. The "magnetic" grain size is found to coincide with the structural only for this particular sample. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1391412
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