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5 Acta Physica Polonica A

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Magnetocaloric Effect in La_{0.8}Sr_{0.2}MnO_{3} Film

100%

Szymczak R. , Dyakonov K. , Radelytskyi I. , Dyakonov V. , Szymczak H.

nr 1

56-58

Thin epitaxial film of La_{0.8}Sr_{0.2}MnO_{3} has been deposited on yz-cut LiNbO_{3} by pulsed laser ablation. The film was characterized by X-ray diffraction and magnetic measurements as a single phase. The magnetic properties and the magnetocaloric effect have been measured as a function of magnetic field and temperature. A reasonably high magnetocaloric effect indicates that this film might provide an efficient material for micro magnetic refrigerators.

Neutron Diffraction Studies of Nanoparticle DyMnO_3 Compound

100%

Szytuła A. , Penc B. , Dyakonov V. , Baran S. , Hoser A.

nr 1

65-66

The neutron powder diffraction (NPD) measurements of the nano-size DyMnO_3 manganite have been performed. The obtained results indicate that this compound crystallizes in the orthorhombic crystal structure described by the space group Pnma. The Mn and Dy moments order antiferromagnetically at different temperatures and form modulated magnetic structure described by the propagation vector k=(k_x, 0, 0) with the different values of k_x component for the Mn and Dy sublattices. The values of k_x component for Mn sublattice increase with decreasing of the temperature and are smaller that in bulk compound. The wide Bragg peaks related to the Dy sublattice suggest that the magnetic order in this sublattice has the cluster-like character.

Surface Magnetic Anisotropy of Epitaxial La_{0.7}Mn_{1.3}O_{2.84} Thin Films

72%

Aleshkevych P. , Baran M. , Dyakonov V. , Szymczak R. , Szymczak H. , Baberschke K. , Lindner J. , Lenz K.

tom 110

nr 1

57-70

A spin-wave resonance technique was used to collect information on elementary magnon excitations in high quality epitaxial La_{0.7}Mn_{1.3}O_{2.84} films prepared by dc-magnetron sputtering. It was found that besides bulk spin-wave modes, the spin-wave resonance spectrum includes also the surface spin waves. The value of spin-wave stiffness constant D=156 meV·Å^2 was found. The values of the surface magnetic anisotropy on both surfaces and their angular dependence were determined. The experimentally found spin-wave resonance spectra were explained based on the surface-inhomogeneity model. The effect of surface anisotropy on the spin-wave excitation conditions in epitaxial La_{0.7}Mn_{1.3}O_{2.84} films was investigated. Spin-wave resonance data give an indirect evidence of periodic charge-ordered stripes formation.

Magnetic and Ferroelectric Ordering in the TbMnO_3 Film

72%

Sazanovich A. , Nikolaenko Y. , Paszkowicz W. , Mikhaylov V. , Dyakonov K. , Medvedev Y. , Nizhankovskii V. , Dyakonov V. , Szymczak H.

nr 1

128-130

Measurements of magnetization and electric polarization performed for the TbMnO_3 film grown onto the single crystal [100] SrTiO_3 substrate using magnetron sputtering technique exhibit series of anomalies related to the magnetic and electric ordering of the Tb^{3+} and Mn^{3+} sublattices. The detailed temperature dependences of the electric polarization and dielectric constant of the TbMnO_3 film have shown that the ferroelectric phase appears below 30 K in magnetic field H > 1 T applied in-plane and out-of-plane of the film.

Magnetic Properties of the Nanocrystalline DyMnO_{3} Compound

72%

Dyakonov V. , Szytuła A. , Baran S. , Kravchenko Z. , Zubov E. , Iessenchuk O. , Bazela W. , Dul M. , Zarzycki A. , Szymczak H.

nr 4

607-610

We report on the X-ray powder diffraction and magnetic measurements of the polycrystalline and the two nanocrystalline samples of DyMnO_{3} compound synthesized at temperatures of 800 and 850°C. All samples at room temperature crystallize in the orthorhombic crystal structure (space group Pnma). The crystal structure parameters determined change only slightly with preparation methods but the average grains size of the nanoparticles determined from X-ray data increases significantly with increasing annealing temperature. Temperature dependence of the magnetic susceptibility indicates the antiferromagnetic order in Dy sublattice at low temperatures.