Phase separation in La5/8Sr3/8MnO3 (30%)+LuMnO3 (70%) bulk sample studied by scanning microwave microscopy

Lee, Jino; Park, Jewook; Kim, Ahram; Char, K.; Park, Soonyong; Hur, Namjung; Cheong, S.-W.
January 2005
Applied Physics Letters;1/3/2005, Vol. 86 Issue 1, p012502
Academic Journal
Using a scanning microwave microscope (SMM), we have investigated the phase separation in a 30% La5/8Sr3/8MnO3 (LSMO)+70% LuMnO3 (LMO) polycrystalline pressed powder sample, in which the LSMO phase is a perovskite ferromagnetic metal while the LMO phase is a hexagonal ferroelectric insulator. When the electrical properties of the sample were imaged using our SMM, the sample showed a significant contrast between the metallic LSMO and the insulating LMO grains, indicating a clear phase separation between the two phases. The metallic phase identified by the SMM clearly showed a ferromagnetic signal when investigated by a magnetic force microscope (MFM), providing solid evidence that the metallic phase is indeed the ferromagnetic LSMO. In addition, we have noticed a slight difference between the images generated by SMM and MFM, and we believe that this is due to the different depth scales probed by the two microscopy techniques.


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