Preculiarities of thin films LaSrMnO prepared by extraction-pyrolysis technique

Tamara N. Patrusheva 

Siberian Federal University (SFU), Krasnoyarskii rabochii 95, Krasnoyarsk 660095, Russian Federation

Abstract

  The transfer of sistem to granular or qusi-twodimention state can chance the energetic structure of substance and open the addition properties. The usage of solution techniques leads to ultra fine structure of filming materials recieving. We have prepared thin films of La1-хSrxMnO3 by extraction-pyrolysis (EP) method with the aim to investigate their properties. The components of composite oxide La0,7Sr0,3MnO3 have been extracted from inorganic solutions. After amplification of metal concentration the organic extracts have been mixed in correlaton La:Sr:Mn = 0,7:0,3:1. The obtained solution was deposited on quartz substrate by spin coating technique. After drying at 100 – 120 ºC the wetting films are undergoed to pyrolysis in the opened vertical quartz furnace. Films with thick of 300 – 400 nm was sintered at different temperatures and single phase La0,7Sr0,3MnO3 films was obtained at 730 – 800 ºC. The average size of grain is about 70 nm. Magnetic measurements have been made with SCVID magnetometer at the temperatures 4,2 – 350 K in fields H = 0 – 64 kA/m. It was established that magnetic behaviour of films depends on annealing temperature. The films prepared by annealing at 600 ºC shown the thermomagnetic effect and the temperature dependance have viuve like a spine glasses. After high temperature annealing at 730 ºC the dependance σ(T) is closed to ferromagnetic and Kjuri temperature is increased. The transition became more more expressive.  At the low temperature we have ansambles of weakly interconnected grains. In this case the magnetic properties are determined by individual properties of grains. As known, at the lowering of grain sizes the Kjuri temperature and magnetic properties are reduced. For this reason, properties of films likes to spine glasses. The high temperature pyrolysis leads to increase of grain sizes and additional oxygen enrichment. Properties of films depending on the annealing conditions are changed from spine glass to ferromagnetic.

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Presentation: Poster at E-MRS Fall Meeting 2009, Symposium E, by Tamara N. Patrusheva
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-23 15:59
Revised:   2009-06-07 00:48
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