摘要:

Magneto‐impedance effects have been observed in thin films of amorphous Fe73.5Cu1Nb3Si13.5B9. Large magneto‐impedance values have been obtained in field‐annealed samples, but not in as‐deposited samples. Transverse magneto‐impedance effects with magnitudes comparable to the longitudinal case have been observed. These results are discussed in terms of appropriate magnetic permeability. ©1995 American Institute of Physics.

ISSN:0003-6951    

DOI:10.1063/1.115242

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

We have grown ferromagnetic MnAs thin films on Si(001) substrates by molecular beam epitaxy. Epitaxial monocrystalline MnAs films with the growth plane of (1¯101) were obtained when the Si surface was first exposed to an As4flux and then Mn and As4fluxes were codeposited. It was found that the very first monolayer of As on Si(001) plays an essential role to obtain epitaxial MnAs thin films. Magnetization measurements indicate that the easy axis of the MnAs thin films is in‐plane, along the [1¯1¯20] of MnAs and the [110] of Si, normal to the substrate misorientation. TheM‐Hcurve of a 300‐nm‐thick film shows a hysteresis with a saturation magnetizationMsof 694 emu/cm3and a coercive fieldHcof 94 Oe, when the magnetic field is applied along the easy axis. ©1995 American Institute of Physics.

ISSN:0003-6951    

DOI:10.1063/1.115243

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

A micro‐Raman study of polydioxolane (PDXL)/NaClO4and PDXL/LiClO4polymeric electrolytes has been carried out in a wide range of salt concentration, at room temperature. The ion–ion interactions and the precipitation of salt microcrystals in the host polymer have been evidenced by means of a line shape analysis of the band associated to the totally symmetric stretching mode (&ngr;1) of the ClO4−anion. The Raman spectra results reveal changes of the crystallinity of the PDXL/MCLO4systems which are directly related to the salt concentration. ©1995 American Institute of Physics.

ISSN:0003-6951    

DOI:10.1063/1.115244

出版商:AIP    

年代:1995

数据来源: AIP

摘要:

Pitch based carbon fibers have been converted to diamond through exposure to a pure hydrogen microwave plasma. The conversion depends strongly on the process pressure. At low pressure only part of the surface of the fiber was converted to diamond, however under optimum conditions a thick continuous diamond layer could be obtained. The carbon conversion efficiency to form diamond at the high pressure was at least an order of magnitude higher than is obtained in a regular CH4+H2plasma assisted diamond deposition. ©1995 American Institute of Physics.

ISSN:0003-6951    

DOI:10.1063/1.115245

出版商:AIP    

年代:1995

数据来源: AIP