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Finite size effect in epitaxial La0.7A0.3CoO3 (A=Ca, Sr, Ba) thin films

✍ Scribed by D. Fuchs; O. Morán; P. Adelmann; R. Schneider

Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
230 KB
Volume
349
Category
Article
ISSN
0921-4526

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✦ Synopsis

The in-plane and out-of-plane magnetization of La 0.7 A 0.3 CoO 3 thin films with A=Ca, Sr, or Ba were investigated as a function of the film thickness ranging from about 10 to 1000 monolayers. Nearly lattice matched epitaxial (0 0 1) oriented films have been grown by pulsed laser deposition on (LaAlO 3 ) 0.3 (Sr 2 AlTaO 6 ) 0.7 substrates. Their magnetic properties were characterized by SQUID measurements. Field cooled measurements were carried out with the field parallel or perpendicular to the film surface. All the films showed a finite size scaling law without any sign of a spin reorientation down to at least 10 monolayers. For the critical exponent we obtained lE0.970.2. For the model parameter No, discussed as the spin-spin coupling length we obtained 2-3 monolayers which compares well with the value measured for Co films.

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