Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 22: Magnetische dünne Schichten IV

MA 22.3: Vortrag

Dienstag, 8. März 2005, 11:00–11:15, TU H1012

Electrical and magnetic effects in multi-ferroic (La,A)MnO₃ / PZT bilayers — •C. Thiele¹, K. Dörr¹, J.-W. Kim¹, W.-M. Lin², and L. Schultz¹ — ¹IFW Dresden, PB 270116, 01171 Dresden — ²IFE, TU Dresden, Mommsenstr. 13, 01062 Dresden

Magnetic and electrical properties of conducting ferromagnetic manganites La_1−xA_xMnO₃ (A= Sr, Ca, Ce) crucially depend on the charge carrier density usually controlled by doping level x. Earlier it was suggested to control epitaxial strain of thin manganite films using the piezoelectric effect of a ferroelectric Pb(Zr,Ti)O₃ (PZT) toplayer [1], however, an electrical field effect seems to be dominant in this type of bilayer structure. Off-axis pulsed laser deposition has been applied to epitaxially grow manganite/PZT bilayers. An electrical voltage applied to the PZT layer in bilayer structures leads to hysteretic modulation of the manganite layer resistance which has been studied in dependence on magnetic field, temperature and manganite layer thickness. The phenomenon is discussed in the framework of a field effect modulating the carrier density of the manganite. Further, magnetization, ferroelectrical polarization and piezoresponse measurements are shown.

This work is supported by DFG, FOR 520.

[1] H. Tabata et al., IEICE Trans. Electron. E80-C (1997) 918