Thin Film

A series of Co/Au multilayers, which exhibit (111) texture and low-field giant magnetoresistance (GMR), were examined with spectroscopic ellipsometry (SE) in a range of Co layer thicknesses (tCo). The obtained optical dielectric functions show a systematic variation with increasing tCo. Analysis of the optical transitions reveals nonmonotonic variations in plasma frequency omegap and the interband parameters with increasing tCo. These

... 10 49 [8] Tian YJ, Lu HB, Xu SF, Chen ZH, Cui DF, Zhou YL, Zhang YZ, Li L and Yang GZ 1994 Physica C 220 114 [9] Foltyn SR, Muenchausen RE, Dye RC, Wu XD, Luo L ... Phys. 71 3419 [22] Holiastou M, Psyharis V, Niarchos D, Haibach P, Frey U and Adrian H 1997 Supercond ...

A quantitative analysis of the response for YBa2Cu3O7−δ thin films in an external DC magnetic field (hysteresis loop) is presented, based on the critical-state model as proposed by Sun et. al. [Phys. Rev. B 44 (1991) 5275]. This model is extended in order to take into account the dependence of the critical current Jc on the applied field Ha through

In recent years research on high density (>10Gbit/in2) recording media has been focused on high anisotropy nanocrystalline materials consisting of magnetic nanograins with high coercivity (>3kOe). We have recently started a project on CoPt/M (M=Ag, C) with the idea of producing granular solids consisting of magnetically hard FCT CoPt particles embedded in Ag and C matrices. The CoPt/Ag films were

First-principles calculations of the energetic and magnetic properties of Fe incorporation in various sites on clean and Ga-bilayer GaN(0001) surfaces are presented. Employing a thermodynamic approach, the calculated formation energies demonstrate characteristic features in the structural stability and magnetism of Fe incorporated surfaces depending on the growth condition. It is found that the N-rich conditions produce greater magnetization compared to

Air-mediated molecular ordering in the self-organized polymer semiconductor of regioregular poly(3-hexylthiophene) (P3HT) is investigated using organic field-effect transistors (OFETs) fabricated by microcontact printing using poly(dimethylsiloxane) stamps having varying surface energy. OFET measurements reveal a large difference between the P3HT thin film microstructure at the interface with air and that at the interface with the substrate and efficient charge transport through the former. These results indicate that the formation of a highly ordered microstructure at the P3HT/air interface through air-mediated self-organization is little affected by substrate-mediated molecular ordering at the other interface of the P3HT film.

... CCline Zimmermann, Ollivier Tamarin, Dominique Rebibre, Corinne DCjous, Jacques Pistrk Laboratoire RL , 35 1 cours de la Libiration F-33405 Talence Cedex ... Abstract - In this paper, polysiloxane coated Love-wave devices are used to detect orgonophosphorus compounds. ...

Anomalous responses of acoustic humidity sensors coated with mesoporous titania have been observed at high humidity levels, due to capillary contraction that alters the film mechanical behavior. As the methods commonly used to assess the elasticity of thin films are difficult to apply during sorption, a dedicated method for the characterization of the variations of the elastic shear modulus of

Acoustic wave sensors uses more and more often micro and nano-structured thin film new materials (e.g. as sensitive layer). This lead to an increasing need for materials viscoelastic properties characterization. A new characterization method is proposed here using Love-wave platforms and allowing the material properties characterization directly with the sensor platform. A Love-wave device consists in a multilayer structure with