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Enhancement of coercivity in nanometer-size CoPt crystallites (1999)

Liou, S. H. ; Huang, S. ; Klimek, E. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 85 (1999), S. 4334-4336

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: In this study, we showed that a magnetic coercivity (Hc) as high as 37 kOe was obtained in a CoPt thin film that contains separated nanometer-size CoPt crystallites. We prepared CoPt thin films with thicknesses of 5 and 175 nm by magnetron sputtering. After annealing in an Ar/H2 atmosphere at temperatures from 650 to 750 °C for 3–12 h, we measured the magnetic properties and found that magnetic Hc relates to annealing temperature, annealing time and film thickness. From atomic force microscopy and magnetic force microscopy studies, the magnetic single domain size of CoPt is in the range of 100–200 nm. The high Hc is likely due to the well-separated nanometer-size crystallites and the well-ordered fct phase of CoPt alloy. © 1999 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.370359

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Microstructure of the Cr underlayer and its effect on Sm-Co//Cr thin films (1995)

Liu, Y. ; Robertson, B. W. ; Shan, Z. S. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 77 (1995), S. 3831-3835

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ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: Sm-Co film is a potential candidate for the future high density recording media of 10 Gb/in2 which requires bit sizes of the order of 300 nm and grain sizes of about 10 nm. This article investigates the microstructure of the Cr underlayer in Sm-Co thin films and its effect on Sm-Co thin films prepared by the dc magnetron sputtering technique. The grain size of the Cr underlayer is found to be about 25 nm. Grains with small angle misorientation usually form local agglomerates. Studies by transmission electron microscopy (TEM) bright field images at different defocus settings and by high resolution electron microscopy indicate that a large proportion of the grain boundaries have gaps. The gap width (about 1–3 nm) varies from place to place. The Sm-Co films deposited on the Cr underlayer inherit similar gaps at positions adjacent to the grain boundary gaps of the Cr underlayer. Such gaps produce grain-like contrast of about 25 nm in TEM bright field images. However, such contrast becomes weak as the thickness of the film increases and disappears at a thickness of 96 nm, suggesting the gaps are sealed at places far from the Cr underlayer. The effect of the Cr underlayer on magnetic properties are discussed. © 1995 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.358559

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Occupational medicine in Taiwan (1999)

Guo, Y. L. ; Wu, T.-N. ; Liou, S.-H. ; [et al.]

Springer

International archives of occupational and environmental health 72 (1999), S. 419-428

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ISSN: 1432-1246

Keywords: Key words Occupational medicine ; Occupational diseases ; Occupational health

Source: Springer Online Journal Archives 1860-2000

Topics: Medicine

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/s004200050395

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