Perovskite manganese oxides, as strongly correlated systems, exhibit a rich interplay of competing metallic and insulating phases that give rise to diverse physical properties, including anisotropic magnetoresistance (AMR), ferromagnetism, and ferroelectricity. This unique behavior has made these materials a subject of intense research in recent years. However, the practical application of manganese oxide-based AMR devices faces significant challenges, such as limited accuracy under low magnetic fields, operational temperatures far from room temperature, and a high preparation threshold, which collectively restrict their viability for angle sensor technologies. In this study, we fabricated La0.67Ca0.33MnO3 (LCMO) films on four distinct substrates ___ LaAlO3 (LAO), NdGaO3 (NGO), (LaAlO3)(0.3)(SrAlTaO6)(0.7) (LSAT), and SrTiO3 (STO) ___ using a sol{gel spin coating technique. The wet films were rapidly sintered at 1100 degrees C in a tubular furnace, yielding LCMO/LAO, LCMO/NGO, LCMO/LSAT, and LCMO/ STO samples. We systematically investigated the impact of substrate choice on the structural, morphological, and magnetotransport properties of the films. Among the samples, the LCMO/LAO film demonstrated exceptional magnetoresistive performance, achieving a magnetoresistance (MR) of 63.6% at 273 K. Furthermore, by optimizing interfacial strain, we enhanced the AMR performance of LCMO/NGO films to _28.7%. These findings not only advance the understanding of strain-mediated MR in perovskite manganites but also pave the way for the application of La1_xCaxMnO(3) thin films in directional magnetic sensors, significantly broadening their potential for room-temperature device integration.
[1]Kunming Univ Sci & Technol, Fac Mat Sci & Engn, Kunming 650093, Yunnan, Peoples R China.
[2]Kunming Met Coll, Fac Met & Min, Kunming 650033, Yunnan, Peoples R China.
[3]Kunming Med Univ, Affiliated Hosp 1, Dept Trauma Ctr, Kunming, Yunnan, Peoples R China.
(8.0+极速模式)