3 MnO 3 multilayers (original) (raw)

Physical Review B, 1999

Abstract

A series of [La2/3Ca1/3MnO3(Lambda/2)/La1/3Ca2/3MnO3(Lambda/2)]15 multilayers, with bilayer thicknesses Lambda between 2 and 32 nm, has been prepared by pulsed laser deposition. The study of their magnetic and magnetotransport properties reveals the presence of an exchange-biasing mechanism at low temperatures. Zero-field-cooling and field-cooling magnetic measurements reveal a blocking temperature around 70 K that is independent from the bilayer thickness, whereas the average film magnetization becomes zero at 250 K. It is observed that the exchange-biasing field HEB at 10 K follows the variation of coercive field Hc with Lambda, indicating that there is a significant contribution in Hc from the exchange anisotropy at the interfaces. The optimum exchange-biasing properties were observed in multilayers with Lambda=8 nm.

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