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Antisite Defects in Epitaxial Films of Lutetium Doped Yttrium Iron Garnets Studied by Nuclear Magnetic Resonance

100%

Chlan V., Štěpánková H., Englich J., Řezníček R., Kouřil K., Kučera M., Nitsch K.

issue 5

846-847

Series of lutetium doped yttrium iron garnet films is studied by means of ^{57}Fe nuclear magnetic resonance. Satellite spectral lines are resolved and identified in the spectra and concentrations of lutetium in dodecahedral sites as well as yttrium/lutetium antisite defects in octahedral sites are estimated. Compared to yttrium, lutetium cations are found to have stronger disposition towards creating the antisite defects.

Hyperfine Field in YIG with Charged Substitution

100%

Kohout J., Štĕpánková H., Englich J., Novák P., Kučera M., Nitsch K.

Acta Physica Polonica A

2000

vol. 97

issue 3

519-522

^{57}Fe NMR spectra were measured on thin films of yttrium iron garnet with divalent (Ca^{2+}) and tetravalent (Ge^{4+}) cation substitutions using the spin echo technique at 4.2 K. A series of Y_{3-x}Ca_{x}Fe_{5-x}Ge_{x}O_{12} samples with 0 ≤ x ≤ 0.0 5 was prepared by an epitaxial growth from BaO/B_{2}O_{3}/BaF_{2} flux on gadolinium gallium garnet substrate. Satellite lines corresponding to the iron ions having the Ge^{4+} and Ca^{2+} in their neighbourhood were identified. The sample with the germanium content of x(Ge) = 0.004 and (110) substrate orientation was used for a detailed study: NMR spectra of this sample were measured in an external magnetic field of 0.1 T applied along several directions in the plane of the film. The modification of the isotropic part and the anisotropy tensor of the hyperfine interaction caused by the Ge^{4+} substituent were obtained from the experimental data. The results were compared with those previously reported for trivalent substitution (Ga^{3+}).

Atmospheric Pressure Plasma Jet for Mass Spectrometry

100%

Babij M., Gotszalk T., Kowalski Z., Nitsch K., Silberring J., Smoluch M.

vol. 125

issue 6

1260-1263

The atmospheric pressure plasma is much advantageous over low pressure plasmas in various aspects, e.g. vacuum-free operation, relative low cost, flexibility of a continuous process. Among various plasmas generated in atmospheric pressure discharges there are cold plasma jets that represent a technology of great application promise (industry, medicine, biology). To generate low-temperature plasmas at atmospheric pressure the dielectric barrier discharge can be used. It is suitable for the atomization of volatile species and can also be served as a ionization source for ambient mass and ion mobility spectrometry. As the discharge is generated in a restricted electrode structure, a plasma jet (plume) is usually formed outside the electrode region (that provides spatial separation of the plasma generation and surface processing regions). The paper presents a source based on a plasma jet established at the end of a capillary dielectric barrier discharge at atmospheric pressure and its application to mass spectrometry. The structure of the jet generator consists of piezoelectric transformer and two concentric and symmetric electrodes, between which the working gas flows at definite rate. Besides the source description early results of spectroscopic analysis are also given.

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3 Acta Physica Polonica A

1 2014

1 2010

1 2000

3 Nitsch K.

2 Englich J.

2 Kučera M.

1 Babij M.

1 Chlan V.

1 Gotszalk T.

1 Kohout J.

1 Kouřil K.

1 Kowalski Z.

1 Novák P.

1 Silberring J.

1 Smoluch M.

1 Řezníček R.

1 Štĕpánková H.

1 Štěpánková H.

Search results

Antisite Defects in Epitaxial Films of Lutetium Doped Yttrium Iron Garnets Studied by Nuclear Magnetic Resonance

Hyperfine Field in YIG with Charged Substitution

Atmospheric Pressure Plasma Jet for Mass Spectrometry