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22 Feb 1988

Volume 52, Issue 8, pp. 599-675

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Correlation of ‘‘twins’’ observed by optical microscopy and transmission electron microscopy in YBa2Cu3O7−x superconductors

H. A. Hoff, A. K. Singh, and C. S. Pande

Appl. Phys. Lett. 52, 669 (1988); http://dx.doi.org/10.1063/1.99370 (3 pages) | Cited 5 times

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By using transmission electron microscopy and optical microscopy on the same specimens, the patterns of light‐ and dark‐contrast lines seen in reflected polarized light were shown to be an interference pattern due to the variable spacing of suboptical microtwins. These microtwins are mostly [110] reflection twins. The [110] twinning was observed to be cyclic and occasionally pseudotetragonal because of the progressive cycling of contact twin domains. Within a domain, and occasionally in a whole grain, the [110] reflection twins occurred as polysynthetic lamellae. The morphology of the domain structure can be explained from the theory of martensitic transformation.
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61.72.Ff Direct observation of dislocations and other defects (etch pits, decoration, electron microscopy, x-ray topography, etc.)
74.70.-b Superconducting materials other than cuprates
61.72.Mm Grain and twin boundaries

Magnetic properties of ion‐beam‐sputtered Fe/Co and Fe/CoFe multilayer films

Masakatsu Senda and Yasuhiro Nagai

Appl. Phys. Lett. 52, 672 (1988); http://dx.doi.org/10.1063/1.99343 (2 pages) | Cited 26 times

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This letter reports on the magnetic properties of Fe/Co and Fe/CoFe multilayer films. A zero magnetostriction is realized by changing the thickness of each layer. In addition, Fe/Co films with high magnetization of more than 2 T and good soft‐magnetic properties of 1.5 Oe coercivity are confirmed. By 300 °C annealing, the hard‐axis coercivity in Fe/Co films decreases to 0.8 Oe. Furthermore, a suitable magnetic domain structure for a thin‐film head is confirmed, and the structure is found to be determined by the total magnetostriction.
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75.70.-i Magnetic properties of thin films, surfaces, and interfaces
75.50.Bb Fe and its alloys
75.80.+q Magnetomechanical effects, magnetostriction
85.70.Kh Magnetic thin film devices: magnetic heads (magnetoresistive, inductive, etc.); domain-motion devices, etc.
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Comment on ‘‘Optical studies of excitons in Ga0.47In0.53As/InP multiple quantum wells’’ [Appl. Phys. Lett. 50, 839 (1987)]

M. S. Skolnick, K. J. Nash, and S. J. Bass

Appl. Phys. Lett. 52, 674 (1988); http://dx.doi.org/10.1063/1.99344 (2 pages) | Cited 1 time

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Abstract Unavailable
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78.66.Fd III-V semiconductors
78.66.Hf II-VI semiconductors
78.55.Cr III-V semiconductors
73.21.-b Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems
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