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Magnetic Properties of the Nanocrystalline DyMnO_{3} Compound

100%

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

Acta Physica Polonica A

2010

vol. 117

issue 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.

Magnetic and Neutron Diffraction Studies of the Polycrystalline and Nanoparticle TbMnO_3

81%

Bażela W., Dul M., Dyakonov V., Gondek Ł., Hoser A., Hoffmann J., Penc B., Szytuła A., Kravchenko Z., Nosalev I., Zarzycki A.

Acta Physica Polonica A

2012

vol. 122

issue 2

384-390

This paper reports on investigations of magnetic properties, crystal and magnetic structures on TbMnO_3 prepared in various ways, namely, as conventional polycrystalline sample and two nano particle specimens (synthesized with a sol-gel method at temperatures of 800 and 850°C). The X-ray and neutron diffraction data confirm the orthorhombic crystal structure (space group Pbnm, No. 62) without noticeable differences of the lattice parameters for poly- and nanocompounds. For the polycrystalline sample, a subsequent ordering of the Mn and Tb sublattices with decreasing temperature was observed. Namely, the Mn sublattice exhibits a modulated magnetic structure with the propagation vector k = (0, k_{x}, 0) in between 41-5 K. Below T = 21 K, a change from a collinear (A_{y} mode) into non-collinear (A_{y}G_{z} mode) structure was evidenced. Further decreasing of temperature below 10 K results in magnetic ordering of the Tb sublattice (modulated G_{x}A_{y}F_{z} mode). For nanoparticle compounds, magnetic ordering in the Mn and Tb sublattices is described by propagation vector k = (0, k_{y}, 0), with k_{y} components higher than observed for polycrystalline sample. The magnetic ordering in the Mn sublattice is described by a collinear A_{y} mode down to 1.6 K where the Tb moment becomes ordered (G_{x}A_{y} mode). The observed broadening of the Bragg peaks connected to the Tb sublattice suggests the cluster-like character of its magnetic structure.

Influence of the Grain Size on the Magnetic Properties of TbMnO_{3}

81%

Bażela W., Dul M., Dyakonov V., Gondek Ł., Hoser A., Hoffmann J., Penc B., Szytuła A., Kravchenko Z., Nosalev I., Zarzycki A.

Acta Physica Polonica A

2012

vol. 121

issue 4

785-788

The magnetic properties including magnetic structure of poly and nano samples of TbMnO_{3} are determined. All the samples investigated are antiferromagnets. In these samples the Mn ad Tb moments order antiferromagnetically at different temperatures and form modulated magnetic structure described by the propagation vector k=(k_{x},0,0) with different value of k_{x} for the Mn and Tb sublattices. Comparison of the data for poly and nano samples indicates the decrease of the moment and increase of the k_{x} component of propagation vector in the nano specimens. The wide Bragg peak related to the Tb sublattice suggests that the magnetic order has the claster-like character. The magnetic moments value in both sublattices is smaller, whereas the k_{x} values are larger for nano samples.

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3 Acta Physica Polonica A

2 2012

1 2010

3 Dul M.

3 Dyakonov V.

3 Kravchenko Z.

3 Szytuła A.

3 Zarzycki A.

2 Bażela W.

2 Gondek Ł.

2 Hoffmann J.

2 Hoser A.

2 Nosalev I.

2 Penc B.

1 Baran S.

1 Bazela W.

1 Iessenchuk O.

1 Szymczak H.

1 Zubov E.

Search results

Magnetic Properties of the Nanocrystalline DyMnO_{3} Compound

Magnetic and Neutron Diffraction Studies of the Polycrystalline and Nanoparticle TbMnO_3

Influence of the Grain Size on the Magnetic Properties of TbMnO_{3}