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Ferromagnetic Resonance Studies of La_{0.67}Ca_{0.33}MnO_3 Film under Stress

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Kundys B., Dyakonov V., Baran M., Gierłowski P., Szymczak R.
Acta Physica Polonica A
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2004
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vol. 105
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issue 1-2
133-139
EN
Ferromagnetic resonance spectra of the La_{0.67}Ca_{0.33}MnO_3 ferromagnetic film deposited onto the x-cut LiNbO_3 substrate were investigated in a wide temperature range. The strain was mechanically introduced into the film using a special holder configuration. This leads to a shift of resonance field with respect to that of the as-grown sample. Analysis of the magnetic resonance shift, induced by a mechanical stress, allowed us to determine the magnetostriction constant λ_{100}. The magnetostriction determined in this way versus saturation magnetization could be well described by the Callen and Callen theory suggesting the domination of the single ion crystal field interaction in the sample being in the ferromagnetic state.
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Magnetoelastic Properties of La_{0.744}Ba_{0.186}MnO_3 Single Crystals

100%
Bukhantsev Y., Mukovskii Y., Vasiliev S., Kundys B., Szymczak H.
Acta Physica Polonica A
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2004
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vol. 105
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issue 1-2
155-162
EN
Magnetoelastic properties of La_{0.744}Ba_{0.186}MnO_3 single crystals have been studied. The basic magnetoelastic constants of the crystal have been estimated using the data of magnetostriction and magnetization measurements, which have been carried out in [010] and [110] crystallographic directions in a wide temperature range from 10 K to 150 K. The anomaly of the thermal expansion has been observed at about 185 K. Near this anomaly two almost degenerated phase transitions have been observed. One of these transitions may be related to the structural phase transition, while the second one to the occurrence of spontaneous strains. The magnetostriction of La_{0.744} Ba_{0.186}MnO_3 single crystal seems to arise due to the effect of applied field on the spontaneous strains.
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