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On Temperature Dependence of Domain Structure in Cobalt

100%

Szmaja W., Polański K., Dolecki K.

Acta Physica Polonica A

1997

vol. 92

issue 2

469-472

The type-I magnetic contrast in a scanning electron microscope is used to study the domain behaviour on the basal planes of cobalt monocrystals of different thicknesses during a heating cycle. Digital image processing is applied to the original scanning electron microscope images for their restoration, enhancement and analysis. The main reasons for the application of digital image processing are: low level of type-I magnetic contrast, particularly used at the higher temperatures, and the complex character of the magnetic domain structure. The changes in both domain structures and type-I magnetic contrast are due to the strong temperature dependence of magnetocrystalline anisotropy energy for the hcp phase of cobalt, which implies the rotation of magnetic easy axis from the c-axis to the basal plane. The temperature of the magnetic phase transition between an open-flux and a closed-flux domain configuration was found to be dependent on the specimen thickness. The changes in domain structure during the heating cycle were reversible under the condition that the specimen was not carried through the hcp-to-fcc phase transition. Otherwise, they were partially or completely irreversible and were caused by crystal imperfections originating from the transition. The paper shows the great advantage of using digital image processing system for data restoration, enhancement and analysis.

Iron Containing Supplement Biofer Investigated by X-ray Fluorescence, Energy Dispersive X-Ray Spectroscopy and Mössbauer Spectroscopy

76%

Brzozowski R., Szałański P., Kaźmierczak J., Polański K., Pruba M., Moneta M.

Acta Physica Polonica A

2015

vol. 128

issue 5

905-907

Iron, an important microelement essential to the functioning of the body, plays a special role in the process of respiration. There are more and more new products available on the pharmaceutical market. Some of them were the subject of previous studies, especially by using the Mössbauer spectroscopy. One of the latest is Biofer. For the present tests three tablets from three different production series of Biofer were used for examination of elemental composition using the X-ray fluorescence and energy dispersive X-ray spectroscopy methods. Information about oxidation of iron contained in the tablets was obtained with by means of the Mössbauer spectroscopy.

Influence of Milling and Compaction Processes οn Magnetic Properties of FeCo Powder

64%

Szumiata T., Gzik-Szumiata M., Brzózka K., Gawroński M., Górka B., Kollár P., Olekšáková D., Polański K., Szmaja W.

Acta Physica Polonica A

2009

vol. 115

issue 1

403-405

Magnetic and structural studies were performed on Fe_{50}Co_{50} material. The samples (disk-shaped, diameter: 10 mm, thickness: 2.5 mm) were fabricated by compaction of powder under pressure of 800 MPa for 5 min at temperatures 300-600°C. The powder was obtained by milling of Fe_{50}Co_{50} alloy swarfs in high-energy planetary mill. The milling time varied from 1 h to 40 h. In the course of milling process the mean size of alloy pieces was decreasing from about 0.5 mm to 0.05 mm (scanning electron microscopy), which provided more compact structure after compression. The annealing process during compaction strongly reduces a coercive field of the samples. Parameters of conversion electron Mössbauer spectra are almost the same for all samples, which points to not significant changes of atomic and magnetic order after milling and compacting.

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3 Acta Physica Polonica A

1 2015

1 2009

1 1997

3 Polański K.

2 Szmaja W.

1 Brzozowski R.

1 Brzózka K.

1 Dolecki K.

1 Gawroński M.

1 Gzik-Szumiata M.

1 Górka B.

1 Kaźmierczak J.

1 Kollár P.

1 Moneta M.

1 Olekšáková D.

1 Pruba M.

1 Szałański P.

1 Szumiata T.

Search results

On Temperature Dependence of Domain Structure in Cobalt

Iron Containing Supplement Biofer Investigated by X-ray Fluorescence, Energy Dispersive X-Ray Spectroscopy and Mössbauer Spectroscopy

Influence of Milling and Compaction Processes οn Magnetic Properties of FeCo Powder