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Details of Magnetic Properties in Pb(Fe_{1/2}Nb_{1/2})O_{3}

100%

Maryško M., Laguta V., Raevski I.

Acta Physica Polonica A

2014

vol. 126

issue 1

376-377

For Pb(Fe_{0.5}Nb_{0.5})O_{3} the χ(T) and m(H) measurements up to 70 kOe were performed with the aim to estimate the antiferromagnetic (AFM) and superantiferromagnetic (SAF) contribution to χ(T). Below T_{N} the increase of χ(T) is attributed to a small part of Fe^{3+} ions in the SAF clusters. For high fields the suppression of the AFM and enhancement of the SAF susceptibility was observed. An inflection point of the m(H) curves below the Néel point suggests the presence of a spin reorientation process connected with the AFM phase.

NMR Study of Multiferroic Iron Niobate Perovskites

76%

Kouřil K., Chlan V., Štěpánková H., Řezníček R., Laguta V., Raevski I.

Acta Physica Polonica A

2015

vol. 127

issue 2

234-236

We present ^{93}Nb, ^{207}Pb and ^{135,137}Ba NMR study of multiferroic lead iron niobate and barium iron niobate ceramics. We ascribe development of NMR spectra on cooling below room temperature to magnetism of ferric ions close to resonating nuclei and introduce a framework capable of describing key features of the observed temperature induced changes. We show that the ferric ions have much stronger influence on hyperfine fields at nuclei of large cations in lead compound and estimate strength of interaction of superantiferromagnetic clusters.

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2 Acta Physica Polonica A

1 2015

1 2014

2 Laguta V.

2 Raevski I.

1 Chlan V.

1 Kouřil K.

1 Maryško M.

1 Řezníček R.

1 Štěpánková H.

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Details of Magnetic Properties in Pb(Fe_{1/2}Nb_{1/2})O_{3}

NMR Study of Multiferroic Iron Niobate Perovskites