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Combined laser and magnetic field treatment of YFeO3-containing films grown by spray-pyrolysis

100%

Mihailov N., Vankov O., Petrova N., Kovacheva D.

Open Chemistry

2004

vol. 2

issue 1

188-195

Thin films (50–1200 nm) of YFeO3 were deposited on fused silica substrates by spray-pyrolysis using ethylene glycol solution of Y-Fe(III) citric complexes. The films were post deposition annealed at 750°C in static air for 2 h. Films obtained in this way were afterwards irradiated by a burst mode operated Nd-YAG laser (pulse energy 650 mJ, pulse duration 700 μs, energy density 110 mJ/cm2). The laser’s onset was synchronized with that of a magnetic field pulse of nearly square shape (magnetic induction 0.5 T, pulse duration 900 μs). The samples were placed normally to the direction of the magnetic field. The treatment does not affect the phase composition of the film but significantly increases the crystallite sizes of the phases presenting in the sample. The saturation magnetization of the films decreases as a result of the laser and magnetic field treatment and the coercive force increases by 50%.

Measurement of Small Variations in Optical Properties of Turbid Inclusions with Respect to Surrounding Turbid Medium

88%

Bliznakova I., Vankov O., Dreischuh T., Avramov L., Stoyanov D.

Acta Physica Polonica A

2009

vol. 116

issue 4

681-683

Special optical system for non-invasive determination of small variations in the optical properties of homogeneous turbid inclusions embedded into large turbid medium is proposed and developed experimentally. Results for different choice of the optical parameters of both media are presented. The minimum detectable changes in the inclusion optical properties are estimated to be less than 5% with respect to the surrounding medium. It is shown that the output signals depend not only on the relative magnitude but also on the sign of the difference in optical properties of both media. The results could be used for developing techniques and algorithms for distinguishing of different kinds of abnormal formations.

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1 Acta Physica Polonica A

1 Open Chemistry

1 2009

1 2004

2 Vankov O.

1 Avramov L.

1 Bliznakova I.

1 Dreischuh T.

1 Kovacheva D.

1 Mihailov N.

1 Petrova N.

1 Stoyanov D.

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Combined laser and magnetic field treatment of YFeO3-containing films grown by spray-pyrolysis

Measurement of Small Variations in Optical Properties of Turbid Inclusions with Respect to Surrounding Turbid Medium