Competing magnetic orders in La0.67Ca0.33MnO3/SrMnO3 multilayers film

• Published in: 2016 IEEE International Nanoelectronics Conference (INEC) pp. 1 - 2
• Main Authors: Yu, T., Wang, F., Liu, W., Ning, X. K., Feng, J. N., Ma, S., Wang, Z. H., Zhang, Z. D., Kim, D., Choi, C. J.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.05.2016
• Subjects: Couplings; exchange bias; Magnetic field measurement; magnetic interface; Magnetic multilayers; Magnetization; multilayers; Nonhomogeneous media; Temperature measurement
• ISSN: 2159-3531
• DOI: 10.1109/INEC.2016.7589364

Epitaxial films of multilayers of La 0.67 Ca 0.33 MnO 3 /SrMnO 3 (LCMO/SMO) and the reference single layer have been deposited by pulsed laser deposition on SrTiO 3 (001) substrate allowing us to perform an exhaustive study of the magnetic coupling at the interface of G-type compensated antiferromagnetic (AFM) and double-exchange ferromagnetic (FM). An unexpected exchange bias (EB) effect at the compensated AFM interface under application of an in-plane cooling has been found. The LCMO/SMO multilayers exhibit an exchange bias field of 123 Oe, which vanishes as the temperature rises above 80 K Spin-cluster-like FM /AFM clusters have been deduced to exist at the interface due to the competing types of magnetic order at the interface. A small magnetization has been found above the Curie temperature of the pure LCMO thin films when applied a small field. We speculate that the short-range high-temperature FM order of the Mn 3+ and Mn 4+ moments above the Curie temperature at the interface gives rise to the magnetic regions that pin the FM LCMO layer as the temperature decreases.