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  • 1
    Electronic Resource
    Electronic Resource
    Magnetic and structural properties of Ba–ferrite films prepared by sol-gel processing (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 7080-7083 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties and microstructure of barium ferrite films (BaFe12O19) coated by a sol-gel technique involving a spin coating of metal-organic compounds are investigated. The in-plane magnetic properties and the grain size are controlled by a Fe/Ba atomic ratio in the coating solution and annealing conditions. The in-plane coercivity increases as the decrease of the Fe/Ba ratio and the increase of the annealing temperature. Maximum value of 4–6 kOe is obtained at the Fe/Ba ratio of 2–8 with the annealing at 900 °C for 10 min. At these preparation conditions, the c axis of the hexagonal barium ferrite is slightly oriented parallel to the film plane. The grain size decreases as the decrease of the Fe/Ba ratio. The films with the Fe/Ba ratio of 4–6 show a grain size of almost one-tenth of that of the sputtered films without additives such as Cr2O3 or CoTi. The smaller grain size of the sol-gel-coated films is probably due to the high nucleation density at the annealing process. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361475
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  • 2
    Electronic Resource
    Electronic Resource
    Magnetic and crystallographic properties of CoCrPt thin films formed on Cr–Ti single crystalline underlayers : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5354-5356 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: By using an epitaxial growth technique, Co73Cr15Pt12(112¯0) bi-crystalline thin films formed on Cr–Tix(001)[x=0–15 at. %] single crystalline underlayers were prepared to investigate the relationship between the magnetic properties and the lattice distortion in the magnetic layer. X-ray diffraction measurement shows that the best lattice matching between the c axis of the CoCrPt and the [110] direction of the Cr–Ti underlayer is realized and the CoCrPt layer shows an ideal symmetrical hcp. structure when the Ti concentration is 10 at. %, where the maximum magneto-crystalline anisotropy energy and coercivity values are observed. Distortion in the hcp. CoCrPt magnetic crystal grains decreases the uniaxial magneto-crystalline anisotropy energy, thus lowering the attainable medium coercivity. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361323
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  • 3
    Electronic Resource
    Electronic Resource
    Improvement of Co71Cr19Pt10/Ti90Cr10 perpendicular recording media by independent optimization of film nucleation and growth processes : The 40th annual conference on magnetism and magnetic materials (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 5359-5361 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: CoCrPt/TiCr perpendicular recording media having independently optimized nucleation and growth conditions have been prepared by changing the argon pressure during sputter deposition of each film. A low argon pressure CoCrPt nucleation layer produces strong c-axis perpendicular orientation that can be maintained during continued CoCrPt deposition at high argon pressure. The two-layer media combines increased particle separation from high pressure growth and strong orientation to produce higher signal to noise ratio than either high pressure or low pressure single layer CoCrPt media. TiCr underlayers, despite poor orientation and a noncolumnar structure, improve CoCrPt c- axis perpendicular orientation. Low argon pressure during TiCr deposition maximizes CoCrPt orientation. A TiCr bilayer having a low pressure nucleation layer followed by a high pressure growth layer improves performance of the subsequent CoCrPt layer. A TiCr bilayer having a high pressure growth layer followed by a thin low pressure template produces even greater recording performance enhancement. This media has Hc=2560 Oe, D50=90 kfci and S0/Nd at 240 kfci=4.0. An identical CoCrPt layer deposited on the low pressure TiCr underlayer has Hc=1850 Oe, D50=80 kfci and S0/Nd at 240 kfci=2.4. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361855
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  • 4
    Electronic Resource
    Electronic Resource
    Magnetic and microstructural properties of CoCrPt/CoCrPtSi dual-layered magnetic recording media : 38th Annual Conference on Magnetism and Magnetic Materials (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 6126-6128 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The magnetic properties of CoCrPt/CoCrPtSi dual-magnetic-layered thin films are investigated in terms of the crystalline microstructures using a vibrating-sample magnometer, transmission electron microscope, and scanning electron microscope. The magnetic crystal grains of the films are aligned with forming chainlike clusters. Each stacked magnetic crystal grain is epitaxially grown on individually isolated columnar Cr crystals with a relationship of hcp (101¯1)Co-based alloy //bcc (110)Cr. The direction of magnetic easy axes of two stacked magnetic crystals are aligned in a same direction. Single-crystalline dual-magnetic-layered thin films, which are epitaxially grown on MgO(110) single-crystal substrates, are prepared to estimate the Ku of the dual-layered magnetic grains. The Ku is determined to be 4×106 erg/cm3, whose value is about 2 times as large as that of single-layered CoCrPtSi. This large anisotropy energy is presumed to lead the increase of Hc in the dual-layered magnetic films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.355430
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  • 5
    Electronic Resource
    Electronic Resource
    Ferromagnetic Mn/C/Si films (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 2132-2134 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ferromagnetism at room temperature has been found in Mn/C/Si films prepared by sequential deposition of these elements at a substrate temperature about 360 °C by vacuum evaporation. The saturation magnetization increases rapidly with the carbon quantity, and it is about 250 emu/cc for a film with a nominal structure of Mn(6 nm)/C(0.5 nm)/Si(6 nm). The magnetization measurements at low temperatures show that the magnetic moment per ferromagnetic Mn atom corresponds to more than 1.2 Bohr magnetons. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360195
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  • 6
    Electronic Resource
    Electronic Resource
    Annealing effects on recording characteristics of CoCr-alloy perpendicular magnetic recording media (2000)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 87 (2000), S. 6890-6892 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Annealing effects of CoCrTa and CoCrPt perpendicular magnetic recording media have been investigated. The coercivity and the squareness increase by postannealing when the annealing temperature is higher than 450 °C and CoCr35/TiCr10 dual underlayer is employed. The CoCr35 underlayer suppresses Ti diffusion to the magnetic layer and provides Cr up to the magnetic layer. The signal-to-noise ratio is improved and the magnetization irregularity diameter observed by magnetic force microscopy (MFM) decreases by the postannealing treatment. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.372876
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  • 7
    Electronic Resource
    Electronic Resource
    Structure and magnetic properties of Mn-Al multilayered films (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 4465-4467 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Correlation between the structure and the magnetic properties of Mn-Al multilayered films prepared by vacuum evaporation have been investigated. Films on MgO(100) substrates with layer thicknesses of 100 A(ring) or more were found to have structures with flat layers and (100) orientation of α-Mn, while a film on a glass substrate and a film with a layer thickness of 50 A(ring) on a MgO(100) substrate were seen to have variations in layer thicknesses and no crystal orientation of α-Mn. Saturation magnetizations for the former two films are more than several times greater than those for the latter two films. From these properties, it is judged that stacking of α-Mn layers with (100) surfaces and Al layers is an important factor for the evolution of ferromagnetic properties in Mn-Al multilayered films.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346074
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of grain size, cluster size, and crystallographic orientation upon simulation of longitudinal recording media : The 41st annual conference on magnetism and magnetic materials (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 3922-3924 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Simulations of hexagonal magnetic particles with uniform exchange energy and random c-axis in-plane orientation do not reproduce real media magnetic properties. Simulation software was thus modified to model four experimentally observed Co-alloy microstructures, to distinguish the effects of grain size, cluster size, exchange decoupling, and cluster substructure; and to more accurately model real media behavior. Results include: (1) Clusters of isolated uniaxial particles act like single grains having the cluster size. Exchange decoupling on a size scale smaller than the crystallographic grain size has little effect upon hysteresis loops or media noise. (2) The magnetic properties of clustered bicrystal and randomly oriented media depend on the exchange interactions within and between clusters of grains. Media hysteresis loops and recorded tracks are well simulated using exchange energies within randomly oriented or bicrystal grain clusters up to ten times larger than those used in the standard model. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.365073
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  • 9
    Electronic Resource
    Electronic Resource
    Layer thickness dependence of magnetic properties in Mn/Al multilayers : 37th Annual conference on magnetism and magnetic materials (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6441-6443 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Relationships between the magnetic properties and the film structure of Mn/Al multilayers are examined by changing the thicknesses of Mn and Al layers. X-ray diffractions show that the Mn lattice spacing measured vertical to the substrate becomes smaller by increasing the Mn layer thickness or by decreasing the Al layer thickness. Saturation magnetization and magnetic anisotropy vary depending on the change of the Mn lattice spacing. Ferromagnetism and magnetic anisotropy of Mn/Al multilayers are closely related to the strain in the Mn lattice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352626
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  • 10
    Electronic Resource
    Electronic Resource
    On the origin of ferromagnetism in Mn-Al multilayered films (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 1348-1352 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Microstructure and magnetic properties of Mn-Al multilayered films are studied by high-resolution transmission electron microscopy (TEM), x-ray diffraction, and vibrating sample magnetometry to investigate the origin of ferromagnetism. High-resolution TEM images show that the Mn-Al interface is sharp and that the crystal lattice is continuous across the interface. The possibility of ferromagnetic alloy formation is ruled out for explaining the origin of ferromagnetism. The magnetic measurements are made on films with various layer thicknesses and numbers of layers. The saturation magnetization increased as the number of interfaces increased. Magnetic anisotropy differs between films with odd and even numbers of layers. These results suggest that the ferromagnetic regions are located around the Mn-Al interfaces, where large strain and/or stress exists.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353254
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