ACTA

Low-Field Magnetoresistance in Manganite Thin Films

E.S. Vlakhov^a,b, K. Dörr^a, K.-H. Müller^a, A. Handstein^a, K. Nenkov^a,b, T. Walter^a, R.A. Chakalov^c, R.I. Chakalova^c and A.Y. Spasov^c
^a Institut für Festkörper- und Werkstofforschung Dresden, P.O. Box 270016, 01171 Dresden, Germany
^b International Laboratory of High Magnetic Fields and Low Temperatures, Gajowicka 95, 53-529 Wrocław, Poland
^c Institute of Electronics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria

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Grain boundaries play an important role in low-field magnetoresistance of La_0.7Ca_0.3MnO₃ and La_0.7Sr_0.3MnO₃ thin films deposited by magnetron sputtering and pulsed laser deposition on YSZ(100) and silicon substrates buffered by YSZ. Well-pronounced low-field magnetoresistance hysteresis was observed in magnetic fields applied in in-plane and out-of-plane directions. High values of local magnetoresistance sensitivity d(MR)/dH in the vicinity of the coercive field were obtained reaching up to 0.2%/Oe for La_0.7Ca_0.3MnO₃ samples at 5 K.

DOI: 10.12693/APhysPolA.97.787
PACS numbers: 75.70.Ak, 73.50.Dn