微細加工を施したペロブスカイト型マンガン酸化物薄膜における電流による物性制御

概要

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We examined electroresistive effects of epitaxial La0.67Ca0.33MnO3(LCMO) thin films deposited on LaAlO3(100)(LAO) substrates. The films are under compressive strain due to lattice mismatch between LCMO (a ≈ 3.86 Å) and LAO (a ≈ 3.79 Å). To relax this strain, our films appear to consist of regions of high-strained charge-ordered insulator (COI) and low-strained ferromagnetic metal (FMM) at low temperatures. By using a micro-fabricating process to the samples, large current density can be applied effectively. These mixed-phase inhomogeneous thin films showed an interesting current-induced first-order transition from COI to FMM. This non-reversible behavior is pronounced with increasing maximum applied current. These results strongly suggest that spin-polarized electrons in FMM are injected into COI; as a result, antiferromagnetic localized electron spins are forced to align ferromagnetically.
社団法人粉体粉末冶金協会の論文
2005-12-15