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  • 1
    Electronic Resource
    Electronic Resource
    Effects of rapid recurrent annealing on structure and magneto-optical properties of garnet films : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6832-6834 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A new method to improve the morphology and the microstructure of sputtered bismuth-substituted garnet films for optical storage is discussed. The method employs a high ramp up rate and recurrent annealing as well as quenching in an air environment, which results in smaller grain size, smoother surface, and less void volume in the garnet films than that from a conventional oven annealing. We have discovered that samples prepared with a more recurrent annealing only appeared as a single garnet phase, and the samples with a less recurrent annealing appeared as a garnet phase as well as DyFeO3 phase. We observed the microstructure of the annealed films with scanning electron microscopy (SEM). By applying the new method, the as-deposited films had been successfully crystallized to the (BiDy)3(FeGa)5O12 garnet phase with the grain size of about 300–400 A(ring). They exhibited excellent magneto-optical properties with a high coercive force about 1300 Oe and an effective Kerr angle of 1.5°. The crystallization process of as-deposited amorphous films as well as the structure, composition, and magnetic and magneto-optical properties of the crystallized garnet films were examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352451
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  • 2
    Electronic Resource
    Electronic Resource
    Increase in perpendicular coercivity of Co–Ni ferrite-plated films by Zn ferrite underlayers (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6878-6880 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The present article explains that Co–Ni ferrite-plated films with perpendicular coercivity Hc⊥ of 3.8 kOe were obtained using Zn ferrite underlayers at the substrate temperature of 90 °C without postannealing. Though a thinner recording layer is required for low noise media, perpendicular anisotropy of Co–Ni ferrite single-layer films of 50 nm in thickness is weak due to worse crystallinity in the initial growth region. Their reproduced waveforms were single pulses, as observed in the longitudinal recording media. Thus, the underlayers of a spinel type of Zn ferrite were used to improve the crystallinity in the Co–Ni ferrite layers, in particular, in the initial growth region. The thickness of the Co–Ni ferrite layer tCoNi was 50 nm, and that of the Zn ferrite underlayers tZn was in the range of 25–110 nm. While Hc⊥ of the Co–Ni ferrite single layers with tCoNi of 50 nm was 2.5 kOe, Hc⊥ of the double-layer films increased with increasing tZn, reaching 3.8 kOe at tZn of 110 nm. The reproduced waveforms exhibited dipulses that are typical in the perpendicular recording media. These results will open the way to develop the perpendicular recording disks with high Hc⊥ using plastic substrates at low temperature. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372872
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  • 3
    Electronic Resource
    Electronic Resource
    Effect of Ni addition into Co ferrite thin films for perpendicular recording media (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6881-6883 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The present article describes effects of doping Ni2+ ions into Co ferrite plated films on film structure, magnetic properties, and read/write characteristics. While thinner films are required for low noise level even in perpendicular recording media, average surface roughness Ra of the Co ferrite films increased from 4 to 6 nm with decreasing the film thickness from 100 to 50 nm. Adding Ni2+ ions had an effect on controlling the grain growth, resulting in a reduction in Ra to 3–4 nm for the 50-nm-thick films by adding a small amount of Ni2+ ions {rm[=CNi/(CCo+CNi)]=0.1}. Perpendicular coercivity Hc⊥ of the Co–Ni ferrite film at rm=0.1 was 2500 Oe, which is almost the same as that of the Co ferrite films, and Hc⊥ decreased with increasing rm. Atomic force microscope images showed that the Co–Ni ferrite films were composed of uniform and isolated grains without coagulation. As a result, a Co–Ni ferrite medium fabricated at rm=0.1 exhibited lower noise level than a Co ferrite medium without Ni addition. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372873
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  • 4
    Electronic Resource
    Electronic Resource
    New rare-earth permanent magnets with an intrinsic coercivity of 10 kOe at 500 °C (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 85 (1999), S. 5660-5662 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Sm(CobalFe0.1CuxZr0.033)z magnets with higher Cu content were found to have higher intrinsic coercivity Hci at both room temperature and higher temperatures up to 500 °C. For the magnets with a ratio z=8.5, the intrinsic coercivity reaches a maximum of about 40 kOe at room temperature when the Cu content x reaches 0.088. But for the magnets with a ratio z=7.0, the intrinsic coercivity continues to increase with increasing Cu content x up to 0.128. Microstructure analysis showed that the cell size decreases while the density of lamella phase increases with increasing Cu content. A record high intrinsic coercivity of 10.8 kOe at 500 °C was obtained on a Sm(CobalFe0.1Cu0.128Zr0.033)z magnet. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.369832
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  • 5
    Electronic Resource
    Electronic Resource
    The role of S passivation on magnetic properties of Fe overlayers grown on GaAs(100) (1999)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 86 (1999), S. 1621-1624 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have produced epitaxial Fe overlayers on sulfur-passivated GaAs(100) surfaces by CH3CSNH2 treatment, and investigated the correlation between magnetic properties of the overlayers and surface chemical structure of GaAs(100) surfaces by ferromagnetic resonance and synchrotron radiation photoemission. The surface chemical properties were modified by changing the annealing temperature of the surfaces prior to the growth. The results show that the magnetization of Fe overlayers is crucially determined by the presence of Ga–S chemical bonds and excess As after the anneals. A comparative investigation of the magnetization has been made on both S passivated and clean GaAs(100). It is confirmed that S passivation on the GaAs surface can effectively eliminate the magnetization deficiency previously attributed to interdiffusion of As into the Fe overlayer. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.370936
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  • 6
    Electronic Resource
    Electronic Resource
    Magnetic properties and microstructure of LaCo5-based powders produced by mechanical milling and subsequent annealing (2002)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 91 (2002), S. 6147-6153 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic and structural properties of LaCo5-based LaxCo100−x (x=17–22) alloys have been studied in powders synthesized by mechanical milling and subsequent annealing. A record high coercivity (over 1.7 T) with a Mr/Ms ratio about 0.7 (measured at room temperature) has been obtained in La22Co78 powders. Their microstructure consists of major LaCo5 phase grains with the grain size of about 150–350 nm, coexisting with LaCo13 phase particles (30–70 nm) and La/La oxide grains (100–200 nm). The observed magnetic properties originate from the high anisotropy field and uniform grain size and shape of the LaCo5 phase. The demagnetization curve, however, often exhibits a shoulder, which was correlated with the appearance of the magnetically soft 1:13 phase and with the inhomogeneity in the microstructure. All the analyses are consistent with a nucleation-type LaCo5 magnet, where the coercivity is attributed to the difficulty in the formation of reversed magnetic domains. The observed phases and microstructure are briefly discussed based on a possible nonequilibrium phase transition resulting in chemical inhomogeneity and oxidation. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1467628
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  • 7
    Electronic Resource
    Electronic Resource
    Nucleation of Al-Cu-Fe alloy in a drop tube (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 7559-7561 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The undercooling and nucleation of an Al65Cu20Fe15 alloy have been investigated with a 1.2-m-long drop tube. Melted droplets solidified either in vacuum or in helium. Various size samples in the forms of a globule, a fine fiber, and an irregular splat were collected at the bottom of the tube. X-ray phase identification results indicated that the CsCl-type cubic phase with a lattice parameter of 2.94 A(ring) and Al-Cu-Fe icosahedral quasicrystalline phase coexist in most specimens. However, the amount of each phase differs in various size samples due to the different cooling rates and undercoolings. It can be concluded that deep undercooling is beneficial to the formation of the Al-Cu-Fe icosahedral phase. In addition, in some rapidly solidified fine fibers (〈105 K/S), the Al-Cu-Fe ternary amorphous phase was also observed by high resolution transmission electron microscopy. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.357989
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  • 8
    Electronic Resource
    Electronic Resource
    A Monte Carlo study of the temperature dependence of magnetic order on ferromagnetic and antiferromagnetic surfaces: Implications for spin-polarized photoelectron diffraction (abstract) : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6452-6452 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have used Ising-model Monte Carlo calculations to study the magnetic order near cubic ferromagnetic and antiferromagnetic surfaces. The antiferromagnets were studied with and without frustrated next-nearest-neighbor interactions. Intralayer and interlayer spin-spin correlation functions have been calculated as a function of the relative coupling strength in the surface layer. If this coupling strength is more than a few times the bulk value, a distinct surface phase transition is observed at temperatures TC,surf or TN,surf that can be significantly above the corresponding bulk values, TC,bulk or TN,bulk. These calculations suggest that previous spin-polarized photoelectron diffraction measurements on antiferromagnetic KMnF3(110) and MnO(001) could in fact have been observing such surface transitions at TN,surf values of 2.7 and 4.5 times TN,bulk, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.358222
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  • 9
    Electronic Resource
    Electronic Resource
    Nucleation of the Al4Mn alloy during containerless solidification in a drop tube (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 4334-4338 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The undercooling and nucleation of Al4Mn alloy have been investigated by containerless solidification in a 1.2 m long drop tube, where molten droplets of the alloy solidified in the vacuum. Droplets in various sizes were collected at the bottom of the tube. It is found by x-ray and electron diffractions that besides the orthorhombic Al6Mn and β-Mn phases, two approximants of the decagonal quasicrystal, one approximant of the icosahedral quasicrystal and decagonal domains can be observed in the as-solidified droplets. However, due to the different cooling rate or undercooling in the samples of different sizes, the phases mentioned above will appear in different amounts. The relationship between the phase composition and the sample size is discussed on the basis of the classical nucleation and growth theories. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359457
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  • 10
    Electronic Resource
    Electronic Resource
    Molecular beam epitaxy of a low strain II-VI heterostructure: ZnTe/CdSe (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 58 (1991), S. 1783-1785 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report the growth of a new closely lattice-matched II-VI heterostructure: ZnTe/CdSe (Δa/a∼0.3%). Epilayers of zinc blende CdSe grown on ZnTe buffer layers are shown to have much better quality than those grown earlier (with a 7% mismatch) on GaAs substrates. This permitted the first successful growth of high quality superlattices of ZnTe/CdSe. The superlattices were studied by x-ray diffraction, transmission electron microscopy, and optical techniques. Results of photoluminescence and optical transmission measurements show that ZnTe/CdSe superlattices have a very small valence-band offset.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.105090
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