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Temperature Dependence of Magnetization Damping in Heusler Alloy Films

100%

Dubowik J., Załęski M., Głowiński H., Gościańska I.

issue 5

848-850

The Gilbert damping for Co_2CrAl (Co_2Cr_{0.3}Fe_{0.7}Al) and Ni_2MnSn Heusler alloy films was investigated as a function of temperature. The best films reveals the Gilbert damping nearly independent of temperature. Magnetic relaxation in Co_2CrAl is strongly influenced by magnetic inhomogeneities due to phase separation. The best Ni_2MnSn epitaxial films have comparable Gilbert damping α of 6× 10^{-3} as half-metallic Co_2Cr_{0.3}Fe_{0.7}Al films with α = 3 × 10^{-3}.

Photoconductivity of Bi_{12}Ti_{1-x}Pb_{x}O_{20} Single Crystal

76%

Borowiec M., Kozankiewicz B., Szymczak H., Żmija J., Majchrowski A., Załęski M., Zayarnyuk T.

vol. 96

issue 6

785-792

Single crystals of mixed sillenites Bi_{12}Ti_{1-x}Pb_{x}O_{20} were grown using the top seeded solution growth method. The pulse illumination was used to study the phototransport properties of these crystals. It was evidenced that the illumination changed the photoconducting properties by 4-5 orders of magnitude comparing with previously studied Bi_{12}MeO_{20}, where Me = Ge, Si, Ti. The performed experiments indicate on the photogeneration of metallic grains in the insulating matrix of Bi_{12}Ti_{1-x}Pb_{x}O_{20}. Correlations between photochromism and photoconductivity was established.

Low-Temperature Structural Phase Transition in Monoclinic RbDy(WO_{4})_{2} Crystal

76%

Borowiec M., Dyakonov V., Kamenev V., Nabiałek A., Prokhorov A., Szymczak H., Załęski M.

Acta Physica Polonica A

1998

vol. 94

issue 1

71-77

The ESR spectrum of Dy^{3+} ion in the low-symmetry RbDy(WO_{4})_{2} crystal has been studied in the temperature region of T=4.2 ÷ 30K. The ESR linewidth was found to increase from 130 mT up to the maximum value of 190 mT at T=9K and then to decrease down to 150 mT at 4.2K. The components of the g-tensor change considerably without change of their spatial orientation in the temperature range from 12K to 7 K: g_{z}=2.5, g_{x}≈0, g_{y}=1.41 at T>12 K; g_{z}=1.53, g_{x}≈0, g_{y}=1.2 at T<7K. The observed λ-shaped behaviour of absorption linewidth and the decrease in the g-factor are assumed to be due to the low-temperature structural phase transition (T_{SPT}≈9 K). The width of the transition area is of about 5K. It is suggested that the symmetry of high- and low-temperature phases is identical.

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3 Acta Physica Polonica A

1 2010

1 1999

1 1998

3 Załęski M.

2 Borowiec M.

2 Szymczak H.

1 Dubowik J.

1 Dyakonov V.

1 Gościańska I.

1 Głowiński H.

1 Kamenev V.

1 Kozankiewicz B.

1 Majchrowski A.

1 Nabiałek A.

1 Prokhorov A.

1 Zayarnyuk T.

1 Żmija J.

Search results

Temperature Dependence of Magnetization Damping in Heusler Alloy Films

Photoconductivity of Bi_{12}Ti_{1-x}Pb_{x}O_{20} Single Crystal

Low-Temperature Structural Phase Transition in Monoclinic RbDy(WO_{4})_{2} Crystal